Cabletron Systems Network Card EMM E6 Ethernet User Manual
EMM-E6  
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EMM-E6  
USER’S  
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ETHERNET  
CABLETRON SYSTEMS, P.O. Box 5005, Rochester, NH 83866-5005  
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NOTICE  
FCC NOTICE  
This device complies with Part 15 of the FCC rules. Operation is subject  
to the following two conditions: (1) this device may not cause harmful  
interference, and (2) this device must accept any interference received,  
including interference that may cause undesired operation.  
NOTE: This equipment has been tested and found to comply with the  
limits for a Class A digital device, pursuant to Part 15 of the FCC rules.  
These limits are designed to provide reasonable protection against  
harmful interference when the equipment is operated in a commercial  
environment. This equipment uses, generates, and can radiate radio  
frequency energy and if not installed in accordance with the operator’s  
manual, may cause harmful interference to radio communications.  
Operation of this equipment in a residential area is likely to cause  
interference in which case the user will be required to correct the  
interference at his own expense.  
WARNING: Changes or modifications made to this device which are not  
expressly approved by the party responsible for compliance could void  
the user’s authority to operate the equipment.  
DOC NOTICE  
This digital apparatus does not exceed the Class A limits for radio noise  
emissions from digital apparatus set out in the Radio Interference  
Regulations of the Canadian Department of Communications.  
Le présent appareil numérique n’émet pas de bruits radioélectriques  
dépassant les limites applicables aux appareils numériques de la class A  
prescrites dans le Règlement sur le brouillage radioélectrique édicté par le  
ministère des Communications du Canada.  
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NOTICE  
VCCI NOTICE  
This equipment is in the Class I Category (information equipment to be  
used in commercial and/or industrial areas) and conforms to the standards  
set by the Voluntary Control Council for Interference by Information  
Technology Equipment (VCCI) aimed at preventing radio interference in  
commercial and/or industrial areas.  
Consequently, when used in a residential area or in an adjacent area  
thereto, radio interference may be caused to radios and TV receivers, etc.  
Read the instructions for correct handling.  
CABLETRON SYSTEMS, INC.  
PROGRAM LICENSE AGREEMENT  
IMPORTANT: Before utilizing this product, carefully read this  
License Agreement.  
This document is an agreement between you, the end user, and Cabletron  
Systems, Inc. (“Cabletron”) that sets forth your rights and obligations  
with respect to the Cabletron software program (the “Program”)  
contained in this package. The Program may be contained in firmware,  
chips or other media. BY UTILIZING THE ENCLOSED PRODUCT,  
YOU ARE AGREEING TO BECOME BOUND BY THE TERMS OF  
THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND THE  
LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY.  
IF YOU DO NOT AGREE TO THE TERMS OF THIS AGREEMENT,  
PROMPTLY RETURN THE UNUSED PRODUCT TO THE PLACE OF  
PURCHASE FOR A FULL REFUND.  
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NOTICE  
CABLETRON SOFTWARE PROGRAM LICENSE  
1. LICENSE. You have the right to use only the one (1) copy of the  
Program provided in this package subject to the terms and conditions  
of this License Agreement.  
You may not copy, reproduce or transmit any part of the Program  
except as permitted by the Copyright Act of the United States or as  
authorized in writing by Cabletron.  
2. OTHER RESTRICTIONS. You may not reverse engineer,  
decompile, or disassemble the Program.  
3. APPLICABLE LAW. This License Agreement shall be interpreted  
and governed under the laws and in the state and federal courts of  
New Hampshire. You accept the personal jurisdiction and venue of  
the New Hampshire courts.  
BELLCORE TESTING INFORMATION  
This product has been tested by Bellcore and found to comply with the  
following Bellcore Standards:  
1. TR-NWT-000063: Network Equipment Building System (NEBS)  
Generic Equipment Requirements  
2. GR-1089-CORE: EMC and Electrical Safety Generic Criteria for  
Network Telecommunications Equipment.  
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NOTICE  
EXCLUSION OF WARRANTY AND  
DISCLAIMER OF LIABILITY  
1. EXCLUSION OF WARRANTY. Except as may be specifically  
provided by Cabletron in writing, Cabletron makes no warranty,  
expressed or implied, concerning the Program (including Its  
documentation and media).  
CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN  
THOSE SUPPLIED TO YOU BY CABLETRON IN WRITING,  
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT  
LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY  
AND FITNESS FOR A PARTICULAR PURPOSE, WITH  
RESPECT TO THE PROGRAM, THE ACCOMPANYING  
WRITTEN MATERIALS, AND ANY ACCOMPANYING  
HARDWARE.  
2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO  
EVENT SHALL CABLETRON OR ITS SUPPLIERS BE LIABLE  
FOR ANY DAMAGES WHATSOEVER (INCLUDING, WITHOUT  
LIMITATION, DAMAGES FOR LOSS OF BUSINESS, PROFITS,  
BUSINESS INTERRUPTION, LOSS OF BUSINESS  
INFORMATION, SPECIAL, INCIDENTAL, CONSEQUENTIAL,  
OR RELIANCE DAMAGES, OR OTHER LOSS) ARISING OUT  
OF THE USE OR INABILITY TO USE THIS CABLETRON  
PRODUCT, EVEN IF CABLETRON HAS BEEN ADVISED OF  
THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME  
STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION  
OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL  
DAMAGES, OR ON THE DURATION OR LIMITATION OF  
IMPLIED WARRANTEES, IN SOME INSTANCES THE ABOVE  
LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.  
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NOTICE  
UNITED STATES GOVERNMENT RESTRICTED RIGHTS  
The enclosed product (a) was developed solely at private expense; (b)  
contains “restricted computer software” submitted with restricted rights in  
accordance with Section 52227-19 (a) through (d) of the Commercial  
Computer Software - Restricted Rights Clause and its successors, and (c)  
in all respects is proprietary data belonging to Cabletron and/or its  
suppliers.  
For Department of Defense units, the product is licensed with “Restricted  
Rights” as defined in the DoD Supplement to the Federal Acquisition  
Regulations, Section 52.227-7013 (c) (1) (ii) and its successors, and use,  
duplication, disclosure by the Government is subject to restrictions as set  
forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and  
Computer Software clause at 252.227-7013. Cabletron Systems, Inc., 35  
Industrial Way, Rochester, New Hampshire 03867.  
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TABLE OF CONTENTS  
CHAPTER 1 INTRODUCTION  
1.1  
1.2  
1.3  
1.4  
USING THIS MANUAL........................................................1-1  
EMM-E6 FEATURES ..........................................................1-4  
THE MMAC WITH FLEXIBLE NETWORK BUS .................1-10  
ETHERNET CHANNELS A, B, C, D, E, and F....................1-12  
1.4.1 Ethernet Channel A................................................1-12  
1.4.2 Ethernet Channels B and C....................................1-13  
1.4.3 Other FNB Modules................................................1-14  
1.4.4 Ethernet Channel D................................................1-15  
CHANNELS E AND F..........................................................1-16  
BRIDGES ............................................................................1-17  
1.6.1 Filtering and Forwarding.........................................1-18  
1.6.2 Spanning Tree Algorithm........................................1-19  
LOCAL MANAGEMENT FEATURES..................................1-20  
COMMUNITY NAMES ........................................................1-21  
SNMP..................................................................................1-21  
1.9.1 MIBs .......................................................................1-22  
REVIEW OF ADDRESSING ...............................................1-22  
1.10.1 MAC Addresses .....................................................1-22  
1.10.2 IP Addresses..........................................................1-23  
1.10.3 Identifying IP Address Classes...............................1-25  
1.10.4 Subnet Addresses..................................................1-25  
1.10.5 Subnet Masks.........................................................1-26  
1.10.6 Operation of the Subnet Mask................................1-30  
1.10.7 Default Gateway.....................................................1-30  
1.10.8 Addressing Example ..............................................1-31  
LANVIEW LEDs AND RESET SWITCH..............................1-33  
LANVIEWSECURE .............................................................1-33  
GETTING HELP..................................................................1-35  
RELATED MANUALS .........................................................1-35  
1.5  
1.6  
1.7  
1.8  
1.9  
1.10  
1.11  
1.12  
1.13  
1.14  
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TABLE OF CONTENTS  
CHAPTER 2 REQUIREMENTS / CONFIGURATIONS  
2.1  
NETWORK REQUIREMENTS ........................................... 2-1  
2.1.1 10BASE-T Twisted Pair Network........................... 2-2  
2.1.2 Multimode Fiber Optic Network ............................. 2-4  
2.1.3 Single Mode Fiber Optic Network.......................... 2-5  
2.1.4 Thin-net Network ................................................... 2-6  
TRANSCEIVER REQUIREMENTS .................................... 2-6  
REPEATER MEDIA INTERFACE MODULES.................... 2-7  
PORT ASSIGNMENT MODULES ...................................... 2-8  
SAMPLE NETWORK CONFIGURATIONS ........................ 2-9  
2.5.1 Three Networks With a Single MMAC-FNB........... 2-10  
2.5.2 The EMM-E6 as a Multiport Router ....................... 2-10  
2.5.3 Adding Users to a Separate Segment ................... 2-11  
2.5.4 A Fault Tolerant Wiring Hierarchy.......................... 2-12  
2.5.5 The EMM-E6 and BRIMs....................................... 2-14  
2.2  
2.3  
2.4  
2.5  
CHAPTER 3 INSTALLATION  
3.1  
3.2  
3.3  
UNPACKING THE EMM-E6 ............................................... 3-2  
SETTING MODE SWITCHES ............................................ 3-3  
SIMM UPGRADES ............................................................. 3-6  
3.3.1 Locating SIMMs..................................................... 3-6  
3.3.2 Installing SIMMs .................................................... 3-8  
ADDING/REPLACING EPIMs ............................................ 3-9  
LOCATING BRIMs.............................................................. 3-10  
PRE-INSTALLATION TEST ............................................... 3-11  
INSTALLING THE EMM-E6................................................ 3-13  
INSTALLATION CHECK-OUT............................................ 3-16  
CONNECTING TO THE NETWORK.................................. 3-18  
3.9.1 Connecting a Twisted Pair Segment to an EPIM-T 3-19  
3.9.2 Connecting an AUI Cable to an EPIM-X................ 3-21  
3.9.3 Connecting to an EPIM-F1/F2, or EPIM-F3........... 3-22  
3.9.4 Connecting a Thin-Net Segment to an EPIM-C..... 3-25  
3.9.5 Connecting an AUI Cable to an EPIM-A................ 3-27  
3.4  
3.5  
3.6  
3.7  
3.8  
3.9  
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TABLE OF CONTENTS  
CHAPTER 4 ATTACHING A CONSOLE  
4.1  
4.2  
CONFIGURING YOUR TERMINAL ....................................4-1  
CONFIGURING A CONSOLE CABLE................................4-3  
4.2.1 Connecting to a VT Series Terminal ......................4-4  
4.2.2 Connecting to an IBM PC or Compatible ...............4-5  
PINOUT DESCRIPTIONS...................................................4-6  
CONFIGURING A UPS CABLE ..........................................4-6  
4.3  
4.4  
CHAPTER 5 ACCESSING LOCAL MANAGEMENT  
CHAPTER 6 COMMUNITY NAMES  
6.1  
6.2  
6.3  
ACCESSING THE COMMUNITY NAME TABLE................6-1  
COMMUNITY NAME TABLE SCREEN FIELDS.................6-2  
ESTABLISHING COMMUNITY NAMES .............................6-3  
CHAPTER 7 CONFIGURATION SCREEN  
7.1  
7.2  
7.3  
7.4  
7.5  
7.6  
7.7  
7.8  
ACCESSING THE CONFIGURATION SCREEN................7-1  
CONFIGURATION SCREEN FIELDS.................................7-2  
SETTING THE HOST IP ADDRESS...................................7-4  
MODIFYING A SUBNET MASK..........................................7-5  
SETTING DEFAULT GATEWAY AND INTERFACE ..........7-6  
CONNECTING/DISCONNECTING A UPS .........................7-8  
UNLOCKING PORTS..........................................................7-9  
ENABLING PORTS.............................................................7-9  
CHAPTER 8 TRAP TABLE SCREEN  
8.1  
8.2  
8.3  
ACCESSING THE TRAP TABLE SCREEN........................8-1  
TRAP TABLE SCREEN FIELDS.........................................8-2  
CONFIGURING THE TRAP TABLE....................................8-2  
CHAPTER 9 SNMP TOOLS SCREEN  
9.1  
9.2  
9.3  
9.4  
9.5  
ACCESSING THE SNMP TOOLS SCREEN ......................9-1  
SNMP TOOLS SCREEN FIELDS .......................................9-2  
THE SECURITY ACCESS LEVEL......................................9-3  
GETTING AND SETTING OIDS .........................................9-4  
SCROLLING THROUGH MIB OIDS ...................................9-6  
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TABLE OF CONTENTS  
CHAPTER 10 ROUTER SETUP SCREEN  
CHAPTER 11 DEVICE STATISTICS SCREEN  
11.1  
11.2  
DEVICE STATISTICS......................................................... 11-2  
DEVICE STATISTICS SCREEN COMMANDS .................. 11-3  
11.2.1 Selecting an Update Frequency ............................ 11-4  
11.2.2 Selecting a Network/Slot/Port................................ 11-5  
11.2.3 Enabling Ports ....................................................... 11-5  
11.2.4 Disabling Ports....................................................... 11-6  
EXITING THE DEVICE STATISTICS SCREEN................. 11-6  
11.3  
CHAPTER 12 COMMAND LINE INTERFACE SCREEN  
CHAPTER 13 MIB NAVIGATOR  
13.1  
13.2  
13.3  
MANAGING DEVICE MIBs................................................. 13-1  
ACCESSING THE MIB NAVIGATOR................................. 13-2  
MIB NAVIGATOR COMMAND SET OVERVIEW............... 13-3  
13.3.1 Conventions For MIB Navigator Commands ......... 13-3  
13.3.2 Navigation Commands .......................................... 13-4  
13.3.3 Built-In Commands ................................................ 13-11  
13.3.4 Special Commands................................................ 13-16  
CHAPTER 14 TROUBLESHOOTING  
14.1  
14.2  
14.3  
USING LANVIEW ............................................................... 14-1  
TROUBLESHOOTING CHECKLIST .................................. 14-4  
USING THE RESET SWITCH............................................ 14-7  
CHAPTER 15 IMAGE FILE DOWNLOAD  
15.1  
15.2  
15.3  
15.4  
GETTING STARTED.......................................................... 15-2  
FORCED DOWNLOAD WITH UNIX................................... 15-3  
STANDARD LOCAL DOWNLOAD..................................... 15-7  
REMOTE RUNTIME DOWNLOAD..................................... 15-8  
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TABLE OF CONTENTS  
APPENDIX A EMM-E6 SPECIFICATIONS  
A.1  
A.2  
A.3  
A.4  
A.5  
A.6  
A.7  
A.8  
A.9  
A.10  
A.11  
A.12  
BRIDGING FUNCTIONALITY.............................................A-1  
REPEATER FUNCTIONALITY ...........................................A-2  
COM 1 PORT......................................................................A-3  
COM 2 PORT......................................................................A-3  
ENVIRONMENTAL REQUIREMENTS ...............................A-3  
SAFETY ..............................................................................A-4  
PHYSICAL PROPERTIES ..................................................A-4  
EPIM-T (10BASE-T TWISTED PAIR PORT) ......................A-5  
EPIM-F1/F2 (MULTIMODE FIBER OPTIC PORT) .............A-6  
EPIM-F3 (SINGLE MODE FIBER OPTIC PORT) ...............A-7  
EPIM-C (BNC PORT)..........................................................A-9  
EPIM-A AND EPIM-X (AUI PORT)......................................A-10  
APPENDIX B EMM-E6 OIDs  
B.1  
B.2  
B.3  
B.4  
SPANNING TREE PROTOCOL..........................................B-1  
CONFIGURING ARP REQUEST PACKETS ......................B-2  
PORT GROUP SECURITY.................................................B-3  
ENABLING & DISABLING SNMP TRAPS ..........................B-6  
B.4.1 Enabling Network Level SNMP Traps....................B-6  
B.4.2 Enabling Module Level SNMP Traps .....................B-7  
B.4.3 Enabling Port Level SNMP Traps...........................B-8  
ACTIVATING RMON GROUPS ..........................................B-10  
BRIDGING...........................................................................B-11  
TRUNK PORT SECURITY..................................................B-11  
CHANNEL SELECTION......................................................B-12  
OID HASHING ON SOURCE ADDRESES.........................B-13  
REMOTE DOWNLOADING ................................................B-13  
B.5  
B.6  
B.7  
B.8  
B.9  
B.10  
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CHAPTER 1  
INTRODUCTION  
Welcome to the Cabletron Systems EMM-E6 User’s Guide. This manual  
explains how to set-up, configure, and locally manage the Cabletron  
Systems 6-port Ethernet Bridge/Management Module (EMM-E6).  
1.1 USING THIS MANUAL  
Read through this manual completely to familiarize yourself with its  
content and to gain an understanding of the features and capabilities of  
the EMM-E6 and its Local Management, or LM, functions. A general  
working knowledge of Ethernet and IEEE 802.3 type data  
communications networks and their physical layer components is helpful  
when installing the EMM-E6 module and when using LM.  
Chapter 1, Introduction, outlines the contents of this manual, briefly  
describes the EMM-E6’s features, provides a brief review of IP  
addressing, and concludes with a list of related manuals.  
Chapter 2, Requirements/Configurations, explains the network  
requirements to consider before installing the EMM-E6. This chapter also  
includes sample configurations to demonstrate various applications for  
the EMM-E6.  
Chapter 3, Installation, provides instructions/guidelines on how to install  
the EMM-E6 into an MMAC-FNB, set the EMM-E6 mode switches, and  
connect segments to your device using optional EPIMs. This chapter also  
explains how to install optional Single In-line Memory Modules, EPIMs,  
and locate Bridge Router Interface Module (BRIM) connectors.  
Chapter 4, Attaching a Console, describes how to attach a Local  
Management console to the EMM-E6. This chapter provides the setup  
and configuration requirements for the console, the console cable, and any  
cable connections.  
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CHAPTER 1: INTRODUCTION  
Chapter 5, Accessing Local Management, describes how to access LM  
after you attach the management console.  
Chapter 6, Community Names, explains how to use the Community  
Name Table screen to set both local and remote access levels.  
Chapter 7, Configuration Screen, describes how to assign IP addresses,  
subnet masks, and the default gateway to the EMM-E6. This chapter also  
explains how to enable and disable all ports.  
Chapter 8, Trap Table Screen, explains how to designate management  
stations as recipients of SNMP alarm or event traps.  
Chapter 9, SNMP Tools Screen, provides information on the resident  
EMM-E6 Management Information Base (MIB) walking tool.  
Chapter 10, Router Setup Screen, Shows the Routing Services Setup  
Screen, where the EMM-E6’s optional Routing Services may be  
accessed.  
Chapter 11, Device Statistics Screen, illustrates the statistics provided by  
EMM-E6/LM. This chapter also describes how to enable and disable  
specific ports on the EMM-E6, and set the statistics update frequency  
time.  
Chapter 12, Command Line Interface Screen, shows the Command  
Line Interface (CLI) screen. This screen will function in future releases of  
EMM-E6 firmware.  
Chapter 13, MIB Navigator, provides instructions and examples for  
using the navigator command set.  
Chapter 14, Troubleshooting, details the EMM-E6 LANVIEW LEDs  
that enable you to quickly diagnose network/operational problems and  
provides suggested courses of action for troubleshooting.  
Chapter 15, Image File Download, provides instructions to download a  
new image file to the EMM-E6 by setting specific MIB OID strings.  
1-2  
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USING THIS MANUAL  
Appendix A, EMM-E6 Specifications, details the properties of the  
EMM-E6 and currently available EPIM modules.  
Appendix B, OID Descriptions, supplies information detailing the  
Object Identifiers that may be accessed for managing the EMM-E6.  
Following the Appendices is a brief Glossary of Terms which provides  
short definitions for terms related to items and concepts referred to in this  
manual.  
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CHAPTER 1: INTRODUCTION  
1.2 EMM-E6 FEATURES  
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i960 Processor Design  
IEEE 802.1d Compliant  
Available Routing Services  
Special Filtering Database  
Six port Ethernet Bridge  
Integrated BRIM technology  
User Configurable EPIMs  
EMM-E6  
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Expandable Local DRAM  
Expandable Shared DRAM  
SNMP and RMON Support  
LANVIEW Diagnostic LEDs  
DLM Support  
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UPS Proxy Agent Support  
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In-Band Telnet with MIB  
Navigator  
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ETHERNET  
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Port Locking and  
LANVIEWSECURE Support  
1-4  
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EMM-E6 FEATURES  
i960 Processor Design  
The EMM-E6 is equipped with an advanced Intel i960 microprocessor  
that provides a scalable RISC-based architecture.  
IEEE 802.1d Compliant  
The EMM-E6 is a fully IEEE 802.1d compliant Ethernet bridge. The  
EMM-E6 supports both the IEEE and DEC Spanning Tree algorithms,  
allowing it to operate in several fault-tolerant bridging environments.  
Available Routing Services  
Cabletron’s own routing services for the EMM-E6 are available as a  
software upgrade. When properly configured with the software upgrade,  
the EMM-E6 is capable of routing IP, IPX, DECnet, AppleTalk, and  
OSPF.  
Special Filtering Database  
The EMM-E6 supports a special filtering database which allows packets  
to be blocked from crossing the bridge based on manager-defined  
parameters.  
Six Port Ethernet Bridge  
The EMM-E6 has six Ethernet ports. Three of these ports (Ethernet  
Channels A, B, and C) operate within the hub. One other port (Ethernet  
Channel D) provides an external connection through one of two Ethernet  
Port Interface Modules (EPIMs) located on the EMM-E6 faceplate. The  
remaining two ports (Ethernet Channels E and F) are externally accessible  
through the use of Cabletron Bridge/Router Interface Modules (BRIMs),  
which can be configured in the module.  
Integrated BRIM Technology  
In addition to Ethernet Channels A through D, the EMM-E6 provides  
management for up to two optional Bridge/Router Interface Modules  
(BRIMs). These modules allow for additional Ethernet connections or  
Fiber Distributed Data Interface (FDDI) network backbones. The  
following lists optional BRIMs:  
For current information on the available BRIM modules supported  
NOTE  
by the EMM-E6, please refer to the Release Notes shipped with the  
module or contact Cabletron Systems.  
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CHAPTER 1: INTRODUCTION  
•
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BRIM-E6: Ethernet module with selectable EPIM connection  
CRBRIM-W/E-IP: Cisco Router Ethernet/Wide Area module for  
TCP/IP traffic.  
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CRBRIM-W/E-DESKTOP: Cisco Router Ethernet/Wide Area  
module for IP, IPX, DECNet, and AppleTalk traffic.  
CRBRIM-W/E-ENT: Cisco Router Ethernet/Wide Area module  
for all standard Cisco protocols.  
All CRBRIM-W/E products provide two WAN interfaces and one  
NOTE  
internally connected Ethernet interface. The Ethernet connection is  
provided through the use of an EPIM-3PS, which is included with  
the purchase of the CRBRIM-W/E product.  
•
BRIM-F0: 100 Mbps FDDI Dual Attached Station (DAS) Media  
Interface Connector (MIC) connection for multimode fiber optic  
media.  
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BRIM-F5: 100 Mbps FDDI DAS MIC connection for single mode  
fiber optic media  
BRIM-F6: 100 Mbps FDDI Dual Attach Station connection with  
configurable connectors  
The BRIM-F6 uses FDDI Port Interface Modules (FPIMs). The FPIMs  
allow a media flexibility for FDDI connections by providing connector  
and media types meeting several ANSI standards. The following FPIM  
types are currently available:  
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FPIM- 00: MultiMode Fiber - Physical Media Dependant  
(MMF-PMD) compliant multimode fiber optic MIC connector  
FPIM- 02: Twisted Pair - Physical Media Dependant (TP-PMD)  
complaint Unshielded Twisted Pair RJ45 connector  
FPIM- 04: TP-PMD compliant Shielded Twisted Pair RJ45  
connector.  
FPIM- 05: Single Mode Fiber - Physical Media Dependant  
(SMF-PMD) compliant single mode fiber optic MIC connector.  
1-6  
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EMM-E6 FEATURES  
•
BRIM-A6: 100/155 Mbps ATM Station connection with  
configurable connector.  
The BRIM-A6 uses ATM Port Interface Modules (APIMs). APIMs allow  
a media flexibility for ATM connections like that provided by FPIMs  
(described above). The following APIM types are currently available:  
•
•
•
APIM-11: 100 Mbps multimode fiber optic SC connector  
APIM-21: 155 Mbps multimode fiber optic SC connector  
APIM-29: 155 Mbps single mode fiber optic SC connector  
User Configurable EPIMs  
The fourth channel (D) directs traffic to one of two external Ethernet Port  
Interface Modules (EPIMs). The following list contains the currently  
available EPIMs:  
•
EPIM-T: 10BASE-T RJ45 Port  
•
EPIM-F1: Sub-Miniature Assembly (SMA) connectors for  
multimode fiber optics  
•
•
EPIM-F2: Straight-Tip (ST) connectors for multimode fiber  
optics  
EPIM-F3: Straight-Tip (ST) connectors for single mode fiber  
optics  
•
•
•
EPIM-C: RG-58 connector for thin coaxial cabling  
EPIM-A: Female DB15 connector for AUI cabling  
EPIM-X: Male DB15 connector for AUI cabling  
Expandable Flash EEPROM Memory  
The EMM-E6 incorporates 2 MB of Flash Electrically Erasable  
Programmable Read Only Memory (Flash EEPROM). Flash memory  
holds the operating instruction code of the EMM-E6. When the module is  
activated, the instruction code (firmware) held in Flash memory is  
forwarded to Main memory, decompressed, and used to startup the  
EMM-E6. As the decompression of firmware slightly delays the  
initialization of the EMM-E6, a Flash memory upgrade is available that  
allows the firmware to be held in its expanded form.  
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CHAPTER 1: INTRODUCTION  
Flash memory allows for the downloading of firmware to the module  
without requiring that the module be shut down. The firmware download  
may be performed at any time during the operation of the module, and the  
new firmware image will be utilized at the next reset of the module.  
Expandable LDRAM  
The EMM-E6 comes with 8 MB of Local Dynamic Random Access  
Memory (LDRAM). LDRAM is the “Main” memory from which the  
routing or bridging functionality of the EMM-E6 operates. When the  
EMM-E6 needs to support additional functionality, an LDRAM upgrade  
may be required. If you are planning to add any functionality to your  
EMM-E6 module, determine if an LDRAM expansion is required.  
Expandable SDRAM  
The EMM-E6 comes with 4 Megabytes (MB) of Shared Dynamic  
Random Access Memory (SDRAM). SDRAM holds packets coming onto  
the module temporarily while forwarding, filtering, and error checking  
decisions are made. While SDRAM has been designed to facilitate future  
expansion, at this time there are no EMM-E6 functions which require or  
are assisted by the expansion of SDRAM memory.  
SNMP and RMON support  
Since the EMM-E6 is SNMP compliant, you can control and monitor the  
device remotely and locally using different SNMP Network Management  
packages. EMM-E6 firmware also supports several RMON groups,  
including:  
•
•
•
•
Alarms  
Events  
History  
Host  
• HostTopN  
• Matrix  
• Statistics  
LANVIEW Diagnostic LEDs  
Cabletron provides a visual diagnostic and monitoring system, called  
LANVIEW, with the EMM-E6. LANVIEW LEDs can help you quickly  
identify device, port, and physical layer problems.  
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EMM-E6 FEATURES  
DLM Support  
The EMM-E6 allows the option of using Cabletron Distributed LAN  
Monitor (DLM) software to locally poll and monitor any Simple Network  
Management Protocol (SNMP) or Internet Protocol (IP) device. The  
EMM-E6 itself tallies the polling results and can be configured to contact  
a management station when a predetermined threshold is exceeded. This  
allows the EMM-E6 to request management attention when it is required,  
reducing management polling over the network.  
Local Communication Ports  
The EMM-E6 provides two RJ45 serial ports on its front panel. The COM  
1 port allows a serial management connection to an American Power  
Conversion Smart Uninterruptible Power Supply (UPS). The COM 2 port  
allows you to access Local Management by locally connecting a DEC  
VT220 or VT320 terminal, or a PC using VT emulation software.  
In-Band Telnet with MIB Navigator  
EMM-E6 firmware supports a management tool which allows for MIB  
navigation from a remote Telnet station.  
Port Locking and LANVIEWSECURE Support  
The EMM-E6 supports Port Locking features and Cabletron’s  
LANVIEWSECURE line of Media Interface Modules (MIMs). The  
EMM-E6 is capable of configuring and controlling LANVIEWSECURE  
MIMs through local or remote management. These security features can  
help reduce the possibility of network eavesdropping.  
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CHAPTER 1: INTRODUCTION  
1.3 THE MMAC WITH FLEXIBLE NETWORK BUS  
The Multi Media Access Center with Flexible Network Bus  
(MMAC-FNB) provides the operational platform for the EMM-E6. The  
MMAC-FNB (backplane) provides two physically separate buses -  
Channel A (operating over the MMAC Power and Management bus), and  
Channels B and C (on the FNB). Each of these channels/buses allows  
different MIM types to access the EMM-E6 (Figure 1-1).  
These channels/buses interconnect through the EMM-E6 to provide  
bridging or routing and management for all MIMs in the MMAC chassis.  
Power & Management Bus  
Ethernet A Bus  
Flexible Network Bus  
Ethernet B Bus  
Ethernet C Bus  
Figure 1-1. MMAC Flexible Network Bus  
Two types of MMACs currently support FNB architecture - shunting and  
non-shunting. MMACs equipped with shunting backplanes allow  
modules operating on Channels B and C to continue communicating with  
the EMM-E6, regardless of whether there is an empty slot or an Ethernet  
Channel A module between them in the chassis. The following table gives  
the part numbers of the MMAC chassis that have shunting capabilities.  
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THE MMAC WITH FLEXIBLE NETWORK BUS  
Table 1-1. MMACs with Shunting Capabilities  
MMAC Chassis  
Part #  
MMAC-3FNB  
MMAC-5FNB  
MMAC-8FNB  
MMAC-M8FNB  
MMAC-M5FNB  
MMAC-M3FNB  
FC000000000 or above  
CC000000000 or above  
CG000000000 or above  
DK000000000 or above  
all  
all  
If your MMAC does not have a shunting backplane, upgrade  
kits are available. For additional information on shunting  
backplanes, or how to upgrade your hub, contact Cabletron  
Systems Technical Support.  
NOTE  
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CHAPTER 1: INTRODUCTION  
1.4 ETHERNET CHANNELS A, B, C, D, E, and F  
The EMM-E6 manages all Ethernet bridging traffic within its resident  
hub. This means that the EMM-E6 controls up to six of the Ethernet  
bridging channels - A, B, C, D, E, and, in the future, F. These channels  
access the same EMM-E6 shared memory, so bridging between channels  
is concurrent.  
1.4.1 Ethernet Channel A  
Channel A operates over the MMAC Power and Management Bus,  
Cabletron’s original Ethernet channel. Only Cabletron Systems  
non-repeater MIMs (i.e., TPMIMs, FOMIMs, and THN-MIMs) access  
the EMM-E6 through Ethernet Channel A. Additionally, the TPXMIM  
Ethernet Port Assignment modules are able to communicate through  
Ethernet Channel A, as well as the additional backplane channels. When  
the EMM-E6 receives a frame on Channel A, it goes through the same  
bridging functions as any of the other channels. In addition, the EMM-E6  
incorporates IEEE 802.3 repeater logic to repeat Channel A frames. In  
other words:  
•
the EMM-E6 bridges for all attached devices, and provides Ethernet  
repeating functions for Channel A modules  
•
even if the EMM-E6 does not bridge the Channel A traffic it  
receives, it still repeats the information back out onto the EthernetA  
Channel.  
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ETHERNET CHANNELS A, B, C, D, E, and F  
1.4.2 Ethernet Channels B and C  
The Cabletron Systems MultiChannel family of MIMs includes the  
Repeater Interface Controller Media Interface Module (RIC MIM), an  
IEEE 802.3 compliant multi-port repeater. You can configure these  
modules to operate on either the Ethernet Channels B or C, or as a  
standalone repeater, using hardware jumpers or management software.  
RIC technology provides the option of connecting multiple RIC MIMs  
over one common bus. This single bus connection allows multiple RIC  
MIMs, communicating over an inter-RIC bus, to act as a single logical  
repeater. For example:  
•
An Ethernet frame follows a path from one RIC MIM, to the  
inter-RIC bus, to another RIC MIM.  
•
The RIC MIM retimes and regenerates the frame before transmitting  
it to all ports.  
Using this configuration yields a path cost equivalent to only one repeater  
hop. Since the limit of serially linked repeaters in an Ethernet network is  
only four, using the RIC repeater offers a significant advantage. By using  
cascading RIC MIMs it is possible to construct a much larger network  
than you could with stand-alone repeaters.  
Channels B and C traffic travels through RIC MIMs (i.e., TPRMIMs,  
FORMIMs, and CXRMIMs). These MIMs repeat packets on their own,  
without the EMM-E6. Ethernet Channels B and C handle network traffic  
over the RIC management bus on the FNB.  
When frames have destination addresses for the same bus:  
•
the sending RIC MIM transmits the frames over its designated  
Ethernet bus;  
•
•
the other RIC MIMs on this bus receive the frames, and repeat them;  
the EMM-E6 receives the frames and, after determining the  
destination, filters the frame.  
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CHAPTER 1: INTRODUCTION  
When frames have destination addresses for a different bus:  
•
the sending RIC MIM transmits the frames over its designated  
Ethernet bus;  
•
•
the other RIC MIMs on this bus receive the frames, and repeat them;  
the EMM-E6, after determining the source and destination, forwards  
the traffic accordingly.  
In addition to providing management for these modules, the EMM-E6  
also gathers Network, Board, and Port Level performance and error  
statistics for each individual RIC MIM on Channels B and/or C.  
1.4.3 Other FNB Modules  
Third Party MIMs - The EMM-E6 recognizes the third party MIMs  
listed below and provides each module with support concerning the  
statistics on the backplane and the control of channel selection for the  
entire module:  
•
•
•
•
•
CSMIM2 - With supported connectivity for Channels A, B, or C in  
an FNB chassis.  
MODMIM - With supported connectivity for Channels A, B, or C  
in an FNB chassis.  
CRM-3E - With supported connectivity for Channels A, B, or C in  
an FNB chassis.  
PCMIM - With supported connectivity for Channel A in any  
MMAC chassis.  
SNACMIM-E - With supported connectivity for Channel A in any  
MMAC chassis.  
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ETHERNET CHANNELS A, B, C, D, E, and F  
FDDI and Token Ring Modules - The EMM-E6 recognizes the  
following FDDI and Token Ring modules, but the EMM-E6 management  
does not provide control or statistics.  
•
•
•
•
•
•
CRM-3T  
SNACMIM  
TRMIM-32A  
TRMIM-34A  
TRRMIM-F2T  
TRRMIM-F3T  
With TRMMIM version 2.02 or greater, both Token Ring and Ethernet  
modules can reside in the same chassis and support physical management  
capabilities of the Token Ring MIMs using the TRMMIM as the Token  
Ring management module. Without the TRMMIM, the EMM-E6 will  
only recognize the Token Ring modules.  
TPXMIM - The EMM-E6 also supports Cabletron’s family of Twisted  
Pair Switching Media Interface Modules (TPXMIMs). These modules  
provide board or individual port connectivity to any MMAC-FNB  
Ethernet channel (A, B, or C) with full SNMP management including  
RMON. All ports initially default to Channel B upon power up and  
require a Management Information Base (MIB) change to access any  
other channel.  
1.4.4 Ethernet Channel D  
Ethernet Channel D is provided by one of the two redundant EPIM ports  
on the front panel of the EMM-E6. These EPIM ports provide the  
capability for the use of a variety of Ethernet transmission media  
connections, including twisted pair, fiber optic, and thick or thin Ethernet  
coaxial cable.  
Either one of the EPIM ports can act as the bridge port to the external  
network. When the EMM-E6 is first powered up, the EPIM 1 port acts as  
the bridge port and the EPIM 2 port is off. Using the network  
management capabilities of the EMM-E6, you can reverse this  
configuration to have the EPIM 2 port act as the primary bridge port.  
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Only one EPIM operates at any given time. However, using both EPIM  
slots in a redundancy configuration ensures that if the primary bridging  
port fails, or the connecting cable segment becomes inoperable, the backup  
port automatically takes over the bridging operation. This is referred to as  
Front Panel Redundancy.  
As it does for Channels B and C, the EMM-E6 only bridges (i.e., it does  
not repeat) Channel D traffic. When the EMM-E6 receives a frame  
destined for Channel D, it goes through the normal bridging process for  
that frame and filters/forwards the information accordingly.  
1.5 CHANNELS E AND F  
The EMM-E6 provides interfaces for two optional Bridge Router  
Interface Modules (BRIMs). These modules provide the EMM-E6 with  
additional connectivity for either bridging or routing functions. At the  
same time, BRIMs provide access to various transmission methods.  
As bridging modules, BRIMs perform the same functions as EPIMs; they  
transfer packets between different channels. However, unlike EPIMs,  
BRIMs bridge these packets from one transmission type to another (e.g.,  
Ethernet to FDDI).  
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BRIDGES  
1.6 BRIDGES  
An Ethernet bridge is a device that allows the expansion of a network  
beyond the limitations of the IEEE 802.3 specified limits for repeated  
Ethernet networks. If an Ethernet network has a repeater hop of four  
repeaters or a round trip propagation delay near the 51.2 µs maximum, a  
bridge can be used to build an extended network. Ethernet bridges read in  
packets and decide to filter or forward based on the destination address of  
the packet. The simple forward/filter decision process allows a bridge to  
segment traffic between two networks, keeping local traffic local. This  
process increases the availability of each network while still allowing  
traffic destined for the opposite side of the bridge to pass.  
Bridges can also connect similar networks together such as Ethernet,  
Token Ring, and Fiber Distributed Data Interface (FDDI) together. Note  
that similar networks means that the upper five layers of the OSI model,  
see Figure 1-2, are the same but that different Data Link and Physical  
layers may be used by the architecture. The Bridge operates at the Data  
Link level of the OSI model. It stores packets and based on the packet  
destination address, forwards or filters the packets. Because bridges work  
at layer 2 of the OSI model, bridges are protocol independent. A bridge  
must read the complete data frame, check for errors, and make forward or  
filter decisions based on recognized addresses stored in its source address  
table.  
7. Application  
6. Presentation  
5. Session  
7
6
5
4
3
2
1
7
6
5
4
3
2
1
4. Transport  
3. Network  
Bridge  
2. Data Link  
1. Physical  
2
1
Figure 1-2. OSI Model  
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The bridge is considered a node on the network and performs store and  
forward functions for packets on each network. This contrasts with a  
repeater which repeats the signal bit by bit from one side of the network  
to the other. The bridge actually reads each packet, checks the packet for  
accuracy, then decides whether the packet should be sent to the other  
network based on the destination address. If the other network is busy, it  
is the responsibility of the bridge to store the packet, for a reasonable  
time, until the transmission can be made.  
The bridge is also responsible for handling collisions. If a collision  
happens as the bridge is transmitting onto the second network, the bridge  
is responsible for the back off and retransmission process. The original  
sending node is not made aware of the collision. It assumes the packet has  
been sent correctly. If the bridge is unable to send the packet to its final  
destination, the original sending station, expecting some response from  
the device it was attempting to contact, will “time out” and, depending on  
the protocol attempt retransmission.  
1.6.1 Filtering and Forwarding  
The bridge decides whether to forward or filter a packet based on the  
physical location of the destination device with respect to the source  
device. A bridge dynamically learns the physical location of devices by  
logging the source addresses of each packet and the bridge port the packet  
was received on in a table called the Source Address Table (SAT).  
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BRIDGES  
1.6.2 Spanning Tree Algorithm  
The Spanning Tree Algorithm (STA) is used by bridges to detect data  
loops (duplicate data paths). The bridges will then automatically break the  
loop and use the now open path as a backup in case the primary path fails.  
When a bridge is powered up, it goes through a series of self tests to  
check its internal operation. During this time the bridge is in a standby, or  
blocking, condition and does not forward traffic. Also during this standby  
period, the bridge sends out special bridge management packets called  
configuration Bridge Protocol Data Units (BPDU). Bridges use the  
BPDUs as a way of communicating with each other. The purpose of the  
configuration BDPU is to notify other bridges on all of the connected  
networks of the current topology.  
After the bridge has informed the network of its presence, the bridge  
enters a second standby state, called listening. During listening, the  
bridge monitors the network for the BPDUs of other bridges. Having  
received packets from the networks, the bridge enters the learning state,  
continuing to block traffic as it examines the information it receives.  
Based on bridge priorities and MAC addresses, the interconnected bridges  
will set bridge ports to either forwarding or standby conditions, allowing  
a single access path to all parts of the network. The bridge or bridges  
involved in this primary data path will then remain in the forwarding  
state, and the bridges with lower priority involved in the backup path(s)  
will remain in a standby condition. Any redundant paths (those placed in  
standby) will be automatically used as need is detected by the operation  
of the Spanning Tree Algorithm.  
The other type of BPDU is the topology change BPDU. This BPDU is  
made up of four bytes and notifies the other bridges that a change has  
taken place. Upon receipt of the topology change BPDU, the bridges  
re-arbitrate, or re-span, to form a legal topology.  
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CHAPTER 1: INTRODUCTION  
1.7 LOCAL MANAGEMENT FEATURES  
Local Management for the EMM-E6 provides tools that allow you to  
manage the device and its attached segments. Through Local  
Management you can:  
•
Assign an IP address and subnet mask to the EMM-E6 bridge via the  
Configuration Screen menu.  
•
•
Select a default gateway and default interface.  
Control EMM-E6 local and remote access by establishing  
Community Names.  
•
•
Designate which Network Management Workstations receive  
SNMP traps from the EMM-E6.  
Navigate through Management Information Bases (MIBs). Since the  
EMM-E6 is an SNMP compliant device, you can manage related  
SNMP MIB objects, given the appropriate security level. You can  
also manage the IETF Bridge MIB objects and many of the RMON  
(Remote Monitoring) MIB objects.  
Other management capabilities include enabling and unlocking all  
managed ports in the Multi Media Access Center (MMAC) chassis.  
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COMMUNITY NAMES  
1.8 COMMUNITY NAMES  
When using Local or Remote Management tools to access the EMM-E6 it  
is important that the Network Manager has the ability to maintain network  
security. Community Names provide some network security by acting as  
passwords into the device and the software running it. The Network  
Manager (Super-user) controls access by establishing four (4) passwords.  
Each of these passwords is associated with a specific level of access to the  
Local Management capabilities of the EMM-E6. The Community Names  
are set through the Local Management Community Name Table. Once  
these are set by the Network Manager, they can be maintained in  
confidence or limited to users who have a need to manage the system. The  
four levels of access are:  
•
•
Super-User - Allows full management privileges  
Read-Write - Allows editing of device configuration parameters not  
including changing Community Names  
•
•
Read-Only - Allows reading of device parameters not including  
Community names  
Basic-Read - Allows reading low level device data  
1.9 SNMP  
SNMP (Simple Network Management Protocol) is a protocol within the  
Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite.  
Network applications such as Local Management and MIB Navigator use  
SNMP to manage device configurations and monitor operating  
conditions. SNMP protocol defines methods for “GETs,” “SETs,” and  
“TRAPs,” either remotely from any point along the TCP/IP network or  
locally. This allows for control of the device from any point along the  
network. SNMP tools use the MIBs located on the device to be managed  
to; access information (GET), change device parameters (SET), and to  
notify previously selected users that an event has occurred (TRAP).  
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1.9.1 MIBs  
The Management Information Bases (MIBs) are a database resident on  
the EMM-E6. Objects in the information base are uniquely identified by  
administratively assigned identifiers (called object identifiers or OIDs),  
and can be viewed, retrieved, or changed using an SNMP packet  
exchange over the network.  
1.10 REVIEW OF ADDRESSING  
For network devices to recognize one another, unique identifiers, referred  
to as addresses, are required. The following sections are intended for  
review, and do not represent a comprehensive description of network  
addressing.  
This section begins by discussing the two types of addressing used in  
TCP/IP networks, Internet Protocol (IP) addresses and Media Access  
Control (MAC) addresses. These descriptions are followed by an  
overview of the process of configuring addresses in a network, including  
examples of network Classes and the creation of subnets within networks.  
1.10.1 MAC Addresses  
The MAC address is a unique, 48-bit binary number, associated with a  
specific physical connection to a network which is capable of generating  
packets. Examples of devices with MAC addresses include SNMP agents  
and DNI cards. MAC addresses are divided into 6 octets, and represented  
in hexadecimal form such as the following:  
00-00-1D-00-26-FB  
All MAC addresses are administered by the IEEE and are generally  
assigned at the time of manufacture, and cannot be changed. The first  
three octets uniquely identify the manufacturer. Cabletron devices’ MAC  
addresses all start with: 00-00-1D.  
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REVIEW OF ADDRESSING  
As MAC addresses are often used to perform management and control  
functions for networking hardware, it is important to be able to identify a  
MAC address when it is requested or returned by network management.  
Since most MAC addresses are set at manufacture and cannot be altered  
by users, this manual does not examine MAC addressing in greater detail.  
1.10.2 IP Addresses  
Each network interface or TCP/IP host is identified by a 32-bit binary  
number called the Internetwork Protocol (IP) address. An IP address  
represents a connection to the network, but does not identify any specific  
physical device location (physical locations are determined by MAC  
Addresses, discussed earlier in this chapter). Every IP address is made up  
of four 8-bit binary numbers (octets). Each octet is translated into its  
decimal equivalent and represented using Dotted Decimal Notation  
(DDN). The DDN format is XXX.XXX.XXX.XXX. Any of the four  
DDN values, called fields, can range from 1 (octet 0000 0001) to 255  
(octet 1111 1111). An IP address is made up of two portions, the Network  
ID and a Host ID. Network IDs refer to a particular network and are  
assigned by the Internet Assigned Numbers Authority (IANA). The IANA  
assigns fixed numbers to one, two, or three of the fields in order to provide  
a unique Network ID.  
Once a Network ID has been assigned, the Network Manager assigns  
individual Host IDs by configuring different values (within the allowable  
ranges) for the octets not set by the IANA. This allows individual hosts on  
the network to be identified by distinct numerical addresses.  
There are three classes of IP addresses which define the Network and  
Host ID numbering scheme. Tables 1-1 through 1-3 describe the classes.  
The bold type in these tables indicates a field assigned by the IANA, the  
Network ID. Any time the term “host” is found in the DDN format  
example address, it indicates a Host ID field, which may be assigned by  
the network manager.  
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Table 1-2. Class A  
Range of Network IDs:  
1 - 126. host. host. host  
[1 octet for the Network ID  
(127 reserved)]  
Binary translation:  
(of first octet)  
0000001 - 01111111  
[first bit is always 0]  
Range for the Host ID:  
net. 1 - 254. 1 - 254. 1 - 254  
[3 octets for the Host ID - allows  
16,777,214 hosts per network]  
Table 1-3. Class B  
Range of Network IDs:  
128 - 191. 1 - 254. host. host  
[2 octets for the Network ID]  
Binary translation:  
(of first octet)  
1000000 - 10111111  
[first bit is always 1 and second  
is always 0]  
Range for the Host ID:  
net. net.1 - 254. 1 - 254  
[2 octets for the Host ID - allows  
65,534 hosts per network]  
Table 1-4. Class C  
Range of Network IDs:  
192 - 223. 1 - 254. 1 - 254. host  
[3 octets for the Network ID]  
Binary translation:  
(of first octet)  
1100000 - 11011111  
[first and second bits always 1  
and third is always 0]  
Range for the Host ID:  
net. net. net. 1 - 254  
[1 octet for the Host ID - allows  
254 hosts per network]  
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REVIEW OF ADDRESSING  
1.10.3 Identifying IP Address Classes  
In the event that you have an existing IP address and need to quickly  
determine what fields are available for Host IP address configuration,  
make that determination based on the binary value of the first DDN field.  
Tables 1-1 to 1-3 show that different address classes have different initial  
bits in the first octet. A Class A address, for example, will always have a  
zero as the first bit of the first octet. To identify an IP address’ class,  
convert the decimal value of the first DDN field to binary.  
Example: 132.177.118.24  
Convert first DDN field to binary: 13210 = 100001002  
Since the first two bits of the octet are 102, the address is Class B. Refer to  
the IP address Classes tables, each Class B address utilizes the first two  
fields for a Network ID (132.177.118.24), while the remaining two fields  
(132.177.118.24) are the Host ID.  
1.10.4 Subnet Addresses  
Subnet addresses are used to partition an IP network into multiple  
subnetworks or subnets. The use of subnet addresses adds an additional  
layer of hierarchy to the IP addressing scheme. This additional addressing  
layer facilitates isolation, control, and administration of users within the  
network, at a cost of reduction in total available Host IDs. This is done by  
grouping hosts into separate subnets. To use the above Class B address,  
132.177.118.24, as an example, the last two fields are available for the  
assignment of Host IDs. If the Network Manager desired to use subnets,  
the third field, 118, could become common to a series or group of hosts  
with a common physical location or intended purpose.  
Example (Class B):  
Net ID  
Host ID  
132.177.118.24  
Subnet Number  
Host Number  
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CHAPTER 1: INTRODUCTION  
Subnet addresses, when used with routing, allow discrimination between  
devices and groups of devices based on IP addresses. Networks of  
different subnets, even those on the same physical network segment, may  
be isolated, from a functional standpoint, from one another through the  
implementation of routing. Repeaters, bridges, and switches, which  
operate at the Data Link layer of the OSI model, make their decisions  
based on MAC addresses. Network devices such as routers, servers, and  
client stations can use IP addressing to recognize transmissions intended  
for them. If a station on one routed subnet sees a transmission from  
another subnet, it will ignore the packet without concern over who it is  
intended for. To overcome this subnetwork blindness a router is used. Any  
station or device which implements subnet masking needs to be  
configured with an address for that subnet’s Default Gateway. When the  
station or device transmits packets intended for a different subnetwork  
than the one it identifies itself as belonging to, the transmission is also  
sent to the Default Gateway, where the gateway or router will make the  
determination of where the packet is sent.  
The use of subnet addresses on the network means using a Subnet Mask  
in conjunction with each IP address.  
1.10.5 Subnet Masks  
The purpose of the Subnet Mask is to indicate the part of the Host ID that  
is being used as a subnet address. By default no part of the Host ID is  
used, and therefore, the default or “Natural Mask” masks just the octets  
that comprise the Network ID. Table 1-5 shows the default masks for the  
four classes of IP networks.  
Table 1-5. Class and Default Masks  
Network Class  
Length of Network ID  
X.  
Default Mask  
Class A  
Class B  
Class C  
255. 0. 0. 0  
X. X.  
255. 255. 0. 0  
255. 255. 255. 0  
X. X. X.  
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REVIEW OF ADDRESSING  
The binary 1’s in the mask “mask-out” the Network ID and the 0’s show  
where the Host ID is located. When using part of the Host ID as a subnet  
address, define a Subnet Mask that will mask-out the bits of the Host ID  
that are being used as a subnet address. The calculations for the mask  
must be done at the bit level since in some cases, and in all cases for Class  
C addresses, the last octet must be split into part Host ID and part Subnet  
ID. Figure 1-3 below, shows the means by which a Subnet Mask blocks  
bits from an IP address to determine which bits are representing a Subnet  
ID and which represent a Host ID.  
Network Actual (195. 191. 21. XXX) - Class C Network ID, assigned by IANA.  
This class of network allows for the creation of up to 254 Host IDs on one network.  
1
1
0
0
0
0
1
1
1
0
1
1
1
1
1
1
0
0
0
1
0
1
0
1
1
1
X X  
X
0
X
0
X X  
X
0
X
0
Default Subnet Mask (255. 255. 255. 0) - Masks out Network ID octets,  
allows all of final octet to be used for Host IDs.  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
1
0
1
0
0
0
0
Modified Subnet Mask (255. 255. 255. 224) - Masks first three bits of fourth octet,  
allowing a portion of the Host ID to be used for Subnet identification. This particular  
custom Subnet Mask allows the creation of six subnets, each having no more than  
thirty hosts (see Table 1-6, below) for a maximum of 180 Host IDs.  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
Subnet Logical - Shows how final five bits of original remain for Host IDs.  
N N  
N
N
N N  
N
N
N N  
N
N
N N  
N
N
N N  
N
N
N N  
N
N
S S  
S
H
H H  
H
H
Subnet Actual (195. 191. 21. 87) - Host number 23 on Subnet number 64.  
Subnet  
64  
Host  
23  
1
1
0
0
0
0
1
1
1
0
1
1
1
1
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
1
1
Figure 1-3. Subnet Masking  
If you decide to modify the default Subnet Mask in order to accommodate  
subnets within your network, you must determine the number of subnets  
you desire and how many Host IDs will be available within each  
configured Subnet.  
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CHAPTER 1: INTRODUCTION  
The example in Figure 1-3 masks out the three high order bits of the only  
octet available for modification, the last octet. This provides for up to six  
subnets and up to 30 Host IDs within each subnet. Modifying the default  
mask for a Class B address (255.255.0.0) to mask out the third octet for  
subnet purposes (255.255.255.0) would provide up to 254 subnets each  
containing up to 254 Host IDs. Tables 1-7 and 1-6 show how using the  
mask determines the subnet and host addresses that are available from an  
individual octet. These tables examine the Host IDs and Subnet Addresses  
available from the use of custom masks in both Class B and Class C IP  
addresses. Bear in mind that Subnet Masks can only be modified for those  
fields which are not assigned to a site by the IANA.  
Table 1-6. Examples of Class C Subnet Masks  
Decimal  
Mask  
Binary  
Equivalent  
Available Subnet  
Addresses  
Available  
Host IDs  
192  
224  
11000000  
11100000  
64 and 192  
1 - 62  
1 - 30  
32, 64, 96, 128,  
192, 224  
240  
240  
248  
252  
254  
255  
11110000  
11110000  
11111000  
11111100  
11111110  
11111111  
16 - 240  
increments of 16  
1 -14  
1 -14  
16 - 240  
increments of 16  
8 - 248  
increments of 8  
1 - 6  
4 - 252  
increments of 4  
1 and 2  
None  
None  
2 - 254  
increments of 2  
1 - 254  
1-28  
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REVIEW OF ADDRESSING  
Table 1-7. Examples of Class B Subnet Masks  
Decimal  
Mask  
Binary  
Equivalent  
Available Subnet  
Addresses  
Host IDs  
Per Subnet  
192. 0  
224. 0  
11000000 00000000  
11100000 00000000  
64 and 192  
16,382  
8,190  
32, 64, 96, 128, 192,  
224  
16 - 240  
increments of 16  
240. 0  
248. 0  
252. 0  
11110000 00000000  
11111000 00000000  
11111100 00000000  
4,094  
2,046  
1,022  
8 - 248  
increments of 8  
4 - 252  
increments of 4  
2 - 254  
increments of 2  
254. 0  
255. 0  
11111110 00000000  
11111111 00000000  
11111111 10000000  
510  
254  
126  
1 - 254  
0 - 255.128  
1 - 255. 0  
255. 128  
0 - 254. 192  
0 - 255. 128  
0 - 255. 64  
1 - 255. 0  
255. 192  
255. 224  
255. 240  
11111111 11000000  
11111111 11100000  
11111111 11110000  
62  
30  
14  
0 - 255. 32, 64, 96,  
128, 160, 192, 224  
0 - 254. 224  
1 - 254. 0  
0 - 254. 240  
0 - 255. 16 - 240  
increments of 16  
1 - 255. 0  
0 - 255. 8 - 240  
increments of 8  
0 - 254. 248  
255. 248  
255. 252  
11111111 11111000  
11111111 11111100  
6
2
0 - 255. 4 - 248  
increments of 4  
0 - 254. 252  
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CHAPTER 1: INTRODUCTION  
1.10.6 Operation of the Subnet Mask  
The Subnet Mask defines how your EMM-E6 treats SNMP Trap IP  
destination addresses in its Trap table (see Chapter 7, Trap Table Screen,  
for additional information on traps).  
When using the Subnet Mask, the EMM-E6 logically determines one of  
two possible locations, either on or not on its own subnet, for each Trap  
IP destination address in its trap table. If the address is on its own subnet,  
the EMM-E6 transmits directly to the workstation with that address. If the  
address is not on its subnet, the EMM-E6 transmits to the workstation  
with that address combined with the Default Gateway IP address. Default  
Gateways are discussed later in this chapter.  
Modify the default Subnet Mask for the EMM-E6 when workstations in  
the Trap table reside on a different subnet (i.e., across a gateway or  
external router), and you want these workstations to receive SNMP Traps  
generated by the EMM-E6. Caution should be exercised when  
configuring subnets, as a poorly subnetted network can greatly increase  
network traffic by duplicating transmissions.  
1.10.7 Default Gateway  
The Default Gateway is the IP address of the network or host to which all  
packets addressed to unknown networks or hosts are sent. The Default  
Gateway should be a perimeter or border device that connects the network  
with the rest of the world. The Default Gateway attempts to route the  
packet to the correct destination. This gateway is often used by managers  
to handle all traffic between private networks and the Internet. If a Default  
Gateway is not defined, the packets addressed to a network or host  
address not found in the forwarding table will be dropped.  
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REVIEW OF ADDRESSING  
1.10.8 Addressing Example  
A network manager, planning for the configuration of a network of 60  
hosts, desires to implement subnets to create logical divisions between  
different groups of workstations and devices. The Internet Assigned  
Numbers Authority has supplied the company with a Class C Network  
Address; 222. 131. 99. XXX.  
Examining Table 1-6 for subnet masking forms, the Network Manager  
decides that, due to the extent of subnetting to be implemented, the last  
option in the subnet table is not realistic, as that configuration offers only  
two subnets. Likewise, the first three options are unacceptable, as they  
would create an excessively large number of subnets with relatively few  
individual hosts per subnetwork. This leaves decimal masks of 248 (31  
subnets, 6 hosts each), 240 (15 subnets, 14 hosts each), and 224 (6  
subnets, 30 hosts each). Any of these decimal masks would support the  
number of Host IDs to be configured. Looking ahead, the Network  
Manager realizes that adding Host IDs to a full network can involve a  
total reconfiguration of subnet strategies, and opts for the decimal mask  
240, which provides room for the configuration of 210 Host IDs.  
On any subnet, one Host ID must be reserved for a connection to the  
NOTE  
router(s) which will interconnect multiple subnets.  
After taking time to fully plan and delineate the required subnets, assign  
them to departments within the company, plan out the initial Host IDs for  
existing devices within those subnets and configure the router(s) which  
will interconnect the various subnets, the Network Manager determines  
where on the network the network management station will reside. The IP  
Host ID of this network management station will be essential when  
configuring the network devices for sending SNMP Traps.  
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CHAPTER 1: INTRODUCTION  
For any SNMP Trap-generating network devices not residing on the same  
subnet as the network management station, the default Subnet Mask  
utilized on that device must be altered to match the subnet scheme. In the  
above example, the default Subnet Mask is modified from  
255. 255. 255. 0 to 255. 255. 255. 240. For each SNMP Trap-generating  
device with a modified Subnet Mask, a Default Gateway is assigned. In  
the event that any of the custom-masked devices generated an SNMP Trap  
for the network management station, a comparison of the Subnet Mask  
and the Network ID indicates that the SNMP Trap should be sent to that  
subnet’s Default Gateway to be routed to the subnet where the network  
management station resides. The procedures for modifying the Subnet  
Mask and configuring the Default Gateway through Local Management  
may be found in Chapter 7 of this User’s Guide, which deals with the  
Configuration Screen.  
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LANVIEW LEDs AND RESET SWITCH  
1.11 LANVIEW LEDs AND RESET SWITCH  
The EMM-E6 incorporates the Cabletron Systems LANVIEW Status  
Monitoring and Diagnostics System. LANVIEW LEDs can help diagnose  
any problems, such as a power failure or a cable fault. The module  
includes the following LANVIEW LEDs:  
•
•
A CPU (Central Processing Unit) LED, for board status  
STBY (Standby), RCV (Receive), XMT (Transmit), and CLN  
(Collision) LEDs for Ethernet Status  
•
Power LEDs for the two EPIM slots.  
The front panel also has a reset switch which allows you to re-initialize  
the processor. Chapter 14, Troubleshooting, provides detailed  
descriptions of each EMM-E6 LANVIEW LED.  
1.12 LANVIEWSECURE  
The EMM-E6 supports the LANVIEWSECURE suite of Ethernet MMAC  
modules. The LANVIEWSECURE products support both inbound data  
(Intruder Prevention) and outbound data (Eavesdrop Prevention). These  
products are identified by the words “LANVIEWSECURE” printed on the  
faceplate of the product.  
Intruder prevention allows ports on the modules to be configured with  
expected MAC addresses. If a port receives a packet from a station or  
device whose MAC address does not correspond to the one previously  
associated with that port, the port will automatically lock, sensing the  
presence of an unauthorized station, then generate and send a trap to the  
Network Management station to indicate the intruder violation.  
Eavesdrop prevention delivers a modified data portion (filled with a  
random pattern of binary ones and zeroes) to all ports on the module  
except the port specified in the original packet’s destination MAC address  
field. Effectively, all ports, except the destination port, recognize the  
presence of a packet, but receive meaningless information.  
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CHAPTER 1: INTRODUCTION  
LANVIEWSECURE modules also provide a “Full security” configuration,  
under which broadcast and multicast packets contain modified data fields  
such as those used in eavesdrop prevention (described above). Ports set to  
Full security mode will not see or respond to these types of packets. The  
default setting for Full security is disabled. Enabling the Full security  
function modifies the broadcast and multicast packets.  
LANVIEWSECURE is enabled upon the locking of a channel, module, or  
port. When enabled, the first two addresses that are learned become the  
expected addresses associated with that port on any LANVIEWSECURE  
module. If a port has never been enabled and a MAC address is added to  
that port, then any MAC address learned on that port will be deleted  
automatically. If a port is enabled and a new address is added to that port,  
then any existing addresses remains in the expected address table.  
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GETTING HELP  
1.13 GETTING HELP  
If you need additional support related to installation, configuration, or  
management of the EMM-E6, or if you have any questions, comments, or  
suggestions concerning this manual, contact Cabletron Systems Technical  
Support:  
By phone.......................... (603) 332-9400  
Monday-Friday; 8am - 8pm ET  
By CompuServe............... GO CTRON from any ! prompt  
By Internet mail............... [email protected]  
1.14 RELATED MANUALS  
Use the following manuals to supplement the procedures and other  
technical data provided in this manual. This manual references procedures  
in these manuals, where appropriate, but does not repeat them.  
Cabletron Systems’ MMAC Overview and Setup Guide  
Cabletron Systems’ Bridge Router Interface Module Guide(s)  
Cabletron Systems’ Repeater Interface Controller Media Interface  
Modules (TPRMIM/FORMIM/CXRMIM) Installation Guide  
Cabletron Systems’ Remote LANVIEW/Windows Network Control  
Management for the Cabletron Systems Station Software User’s  
Manual  
Cabletron Systems’ Router Services Manuals  
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CHAPTER 2  
REQUIREMENTS / CONFIGURATIONS  
This chapter contains general networking guidelines. Before attempting  
to install the EMM-E6 or any additional EPIMs or BRIMs, review the  
requirements and specifications outlined in this chapter.  
Your network installation must meet the conditions, guidelines,  
specifications, and requirements included in this chapter to ensure  
satisfactory performance of this equipment. Failure to follow these  
!
CAUTION  
guidelines may produce poor network performance.  
2.1 NETWORK REQUIREMENTS  
Take care in planning and preparing the cabling and connections for your  
network. The quality of the connections, the length of cables, and other  
conditions of the installation play critical roles in determining the  
reliability of your network.  
Refer to sections below that apply to your specific network configuration.  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.1.1 10BASE-T Twisted Pair Network  
When connecting a 10BASE-T segment at any of the 10BASE-T hub  
ports or a 10BASE-T Ethernet Port Interface Module (EPIM-T), ensure  
that the network meets the following requirements:  
•
Length - The IEEE 802.3 10BASE-T standard requires that  
10BASE-T devices transmit over a 100 meter (328 foot) link using  
22-24 AWG unshielded twisted pair wire. However, cable quality  
largely determines maximum link length. If you use high quality,  
low attenuation cable, it may be possible achieve link lengths of up  
to 200 meters. Cable delay limits maximum link length to 200  
meters, regardless of the cable type.  
Losses introduced by connections at punch-down blocks and other  
NOTE  
equipment reduce total segment length. For each connector or  
patch panel in the link, subtract 12 meters from the total length of  
your cable.  
•
•
Insertion Loss - Between frequencies of 5.0 and 10.0 MHz, the  
maximum insertion loss must not exceed 11.5 dB. This includes the  
attenuation of the cables, connectors, patch panels, and reflection  
losses due to impedance mismatches in the link segment.  
Impedance - Cabletron Systems 10BASE-T Twisted Pair products  
work on twisted pair cable with 75Ω to 165Ω impedance.  
Unshielded twisted pair cables typically have an impedance of  
between 85Ω and 110Ω. You can also use shielded twisted pair  
cables, such as IBM Type 1 cable, but keep in mind that this cable  
has an impedance of 150Ω.  
The high impedance of the IBM Type 1 cable increases signal  
reflection. However, due to cable shielding, and its subsequent lack  
of crosstalk between shielded pairs, this signal reflection has little  
effect on the quality of the received signal.  
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NETWORK REQUIREMENTS  
•
Jitter - Intersymbol interference and reflections can cause jitter in  
the bit cell timing, resulting in data errors. 10BASE-T links must not  
generate more than 5.0 ns of jitter. Make sure your cable meets  
10BASE-T link impedance requirements to rule out jitter as a  
concern.  
•
•
•
Delay - The maximum propagation delay of a 10BASE-T link  
segment must not exceed 1000 ns. This 1000 ns maximum delay  
limits the maximum link segment length to no greater than 200  
meters.  
Crosstalk - Signal coupling between different cable pairs within a  
multi-pair cable bundle causes crosstalk. 10BASE-T transceiver  
design alleviates concerns about crosstalk, providing the cable  
meets all other requirements.  
Noise - Crosstalk, or externally induced impulses, are causes of  
noise. Impulse noise may cause data errors if the impulses occur at  
very specific times during data transmission. Generally, noise is not  
a concern. If you suspect noise-related data errors, you may need to  
reroute the cable or eliminate the source of the impulse noise.  
•
Temperature - Multi-pair PVC 24 AWG telephone cables typically  
have an attenuation of approximately 8-10 dB/100 m at 20°C (78°F).  
The attenuation of PVC insulated cable varies significantly with  
temperature. At temperatures greater than 40°C (104°F), we  
strongly recommend using plenum-rated cable to ensure attenuation  
remains within specification.  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.1.2 Multimode Fiber Optic Network  
When connecting a multimode fiber optic link segment to the hub (via  
EPIM-F1/F2), ensure the network meets the following requirements:  
•
Cable Type - Use the EPIM-F1 and EPIM-F2 for the following  
multimode fiber optic media:  
-
-
-
50/125 µm fiber optic cabling  
62.5/125 µm fiber optic cabling  
100/140 µm fiber optic cabling  
•
Attenuation - You must test the fiber optic cable with a fiber optic  
attenuation test set adjusted for an 850 nm wavelength. This test  
verifies that the signal loss in a cable falls within the following  
acceptable levels:  
-
-
-
13.0 dB or less for a 50/125 µm fiber cable segment  
16.0 dB or less for a 62.5/125 µm fiber cable segment  
19.0 dB or less for a 100/140 µm fiber cable segment  
•
Budget and Propagation Delay - When you determine the  
maximum fiber optic cable length to incorporate fiber runs into your  
network, you must calculate and consider the fiber optic budget (a  
total loss of 10.0 dB or less is permissible between stations) and total  
network propagation delay.  
To determine the fiber optic budget, combine the optical loss due to  
the fiber optic cable, in-line splices, and fiber optic connectors.  
Typical loss for a splice and connector (together) equals 1 dB or less.  
Total propagation delay allowed for the entire network must not  
exceed 25.6 µs in one direction (51.2 µs round trip). If the total  
propagation delay between any two nodes on the network exceeds  
25.6 µs, you must either reduce the delay or use a bridge.  
•
Length - The maximum possible multimode fiber optic cable length  
is 2 km (2187.2 yards). However, IEEE 802.3 FOIRL specifications  
specify a maximum of 1 km (1093.6 yards).  
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NETWORK REQUIREMENTS  
2.1.3 Single Mode Fiber Optic Network  
When connecting a single mode fiber optic link segment to the hub (via  
EPIM-F3), ensure the network meets the following requirements:  
•
Cable Type - Fiber optic link segments should consist of 8/125 to  
12/125 µm single mode fiber optic cabling. You can also use  
62.5/125 µm multimode cable with the EPIM-F3; however,  
multimode cable has greater optical loss, and limits the possible  
distance to 2 km.  
•
•
Attenuation - You must test the fiber optic cable with a fiber optic  
attenuation test set adjusted for a 1300 nm wavelength. This test  
verifies that the signal loss in a cable falls within the acceptable level  
of 10.0 dB or less for any given single mode fiber optic link.  
Budget and Propagation Delay - When you determine the  
maximum fiber optic cable length to incorporate fiber runs into your  
network, you must calculate and consider the fiber optic budget (a  
total loss of 10.0 dB or less is permissible between stations) and total  
network propagation delay.  
To determine the fiber optic budget, combine the optical loss due to  
the fiber optic cable, in-line splices, and fiber optic connectors.  
Typical loss for a splice and connector (together) equals 1 dB or less.  
Network propagation delay is the amount of time it takes a packet to  
travel from the sending device to the receiving device. Total  
propagation delay for the entire network must not exceed 25.6 µs in  
one direction (51.2 µs round trip). If the total propagation delay  
exceeds 25.6 µs, you must use bridges.  
•
Length - If you meet all system budgets, the maximum single mode  
fiber optic cable length can reach 5 km (3.1 miles) with bridges at  
each segment end. However, IEEE 802.3 FOIRL specifications  
specify a maximum of 1 km (1093.6 yards).  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.1.4 Thin-net Network  
When connecting a thin-net (coaxial) segment to your hub (via an  
EPIM-C), ensure your network meets the following requirements:  
•
Cable Type - Use only 50 ohm RG-58A/U type coaxial cable for  
thin-net cable segments.  
•
•
•
Length - The thin-net segment must not exceed 185 meters.  
Terminators - Terminate each end of a thin-net segment.  
Connectors - You can use up to 29 T-connectors throughout the  
length of the cable segment for host connections.  
If you use an excessive number of barrel connectors within the cable  
segment (e.g., finished wall plates with BNC feed-throughs), you  
may need to reduce the number of host connections. For special  
network design, contact Cabletron Systems Technical Support.  
•
Grounding - For safety, ground only one end of a thin-net segment.  
Do NOT connect EPIM BNC ports to earth ground.  
Connecting a thin-net segment to earth ground at more than one  
point could produce dangerous ground currents.  
2.2 TRANSCEIVER REQUIREMENTS  
When you connect an external network segment to an EPIM-A in your  
hub through a transceiver, that transceiver must meet IEEE 802.3  
standards or Ethernet version 1.0 or 2.0 requirements. The transceiver  
must also have SQE disabled.  
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REPEATER MEDIA INTERFACE MODULES  
2.3 REPEATER MEDIA INTERFACE MODULES  
The EMM-E6 communicates with the Repeater MIMs over Ethernet  
Channels B and C of the MMAC-FNB. The following repeater MIMs are  
currently available:  
•
•
•
CXRMIM: coaxial repeater MIM; twelve 10BASE-2 coaxial  
connectors; one EPIM.  
FORMIM-22: fiber optic repeater MIM; twelve FOIRL/  
10BASE-FL ports; ST type connectors.  
TPRMIM-20/TPRMIM-22: twisted pair repeater MIM; RJ45  
connectors (TPRMIM-20 has nine, TPRMIM-22 has twenty-one);  
one EPIM.  
•
TPRMIM-33/TPRMIM-36: twisted pair repeater MIM; 50-pin  
RJ71 connectors (TPRMIM-33 has one, TPRMIM-36 has two);  
each RJ71 connector provides twelve 10BASE-T twisted pair ports  
(twelve total for TPRMIM-33, twenty-four total for TPRMIM-36);  
each MIM has one EPIM; the TPRMIM-36 also has one AUI port.  
For more information regarding Cabletron Systems Repeater MIMs, refer  
to your Repeater Media Interface Modules (TPRMIM/FORMIM/  
CXRMIM) Installation Guide.  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.4 PORT ASSIGNMENT MODULES  
•
TPXMIM-20/TPXMIM-22: twisted pair port and bank assignment  
repeater MIM; RJ45 connectors (TPXMIM-20 has nine, TPXMIM-  
22 has twenty-one); one EPIM.  
•
TPXMIM-32/TPXMIM-36: twisted pair port and bank assignment  
repeater MIM; RJ71 connectors (TPXMIM-32 has one, TPXMIM-  
36 has two); one EPIM.  
Figure 2-1. Sample Repeater MIMs  
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SAMPLE NETWORK CONFIGURATIONS  
2.5 SAMPLE NETWORK CONFIGURATIONS  
This section provides you with several examples for configuring networks  
with the EMM-E6. These examples illustrate the flexibility and  
advantages to using the EMM-E6 and RIC MIM technology:  
2.5.1 Three networks with a single MMAC-FNB  
2.5.2 The EMM-E6 as a multi-port router  
2.5.3 Adding users to an existing network  
2.5.4 A fault tolerant wiring scheme  
2.5.5 The EMM-E6 and BRIMs  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.5.1 Three Networks With a Single MMAC-FNB  
One of the basic applications of the EMM-E6 is for configuring three  
separate networks within one MMAC. This provides you with the  
advantages of having three separate networks in one wiring closet, with  
full bridging and SNMP management for each network. Figure 2-2  
illustrates an example of the three network configuration.  
Channel E  
EMM-E6  
TPMIM-24  
TPMIM-24 FORMIM-22 FORMIM-22  
CXRMIM  
TPRMIM-33  
Channel F  
Channel D  
E
F
Channel A  
Channel B  
Channel C  
Figure 2-2. Single MMAC-FNB Configuration  
2.5.2 The EMM-E6 as a Multiport Router  
An EMM-E6 routing image allows you to set up the module as a multi-  
port router. For information on how to upgrade the EMM-E6 to perform  
routing functions, and how to configure the EMM-E6 as a multi-port  
router, refer to Cabletron Systems’ Router Services Manual or contact  
Cabletron Systems Technical Support.  
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SAMPLE NETWORK CONFIGURATIONS  
2.5.3 Adding Users to a Separate Segment  
The example in Figure 2-3 compares two methods of connecting 48  
additional users to a network.  
Single - ChanneMlultichannel  
Single - Channel  
Multi - Channel  
Initial 48 Users  
TPMIM-24  
TPMIM-24  
IRM3  
TPMIM-24  
TPMIM-24  
EMM-E6  
48 Users  
-
-
-
an MMAC-FNB  
an EMM-E6  
two 24-port  
RIC MIMs  
-
-
-
an MMAC  
an IRM2  
two 24-port MIMs  
Channel C  
48 Users  
An Additional 48 Users Require:  
TPMIM-24  
TPMIM-24  
IRM3  
48 Users  
TPMIM-24  
TPMIM-24  
TPMIM-24  
TPMIM-24  
EMM-E6  
- an additional MMAC  
- an additional IRM2  
- two additional  
-
two additional  
24-port RIC MIMs  
Bridge  
24-port MIMs  
TPMIM-24  
TPMIM-24  
IRM3  
- an external bridge  
Channel B  
48 Users  
Channel C  
48 Users  
48 Users  
Another Additional 48 Users Require:  
TPMIM-24  
TPMIM-24  
IRM3  
48 Users  
TPMIM-24  
TPMIM-24  
TPMIM-24  
TPMIM-24  
TPMIM-24  
EMM-E6  
TPMIM-24  
-
two additional  
24-port  
non-RIC MIMs  
- an additional MMAC  
- an additional IRM2  
- two additional  
Bridge  
24-port MIMs  
TPMIM-24  
TPMIM-24  
IRM3  
- an external bridge  
Channel A Channel B Channel C  
48 Users 48 Users 48 Users  
48 Users  
Bridge  
TPMIM-24  
TPMIM-24  
IRM3  
48 Users  
Figure 2-3. Adding New Users  
To place additional users on a new network with an EMM-E6, you only  
need to add a few additional MIMs to the MMAC-FNB.  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.5.4 A Fault Tolerant Wiring Hierarchy  
The example in Figure 2-4 illustrates a fault tolerant wiring hierarchy.  
D
C
D
B
A
MiniMMAC  
D
D
Closet 1  
D
BRIDGE  
STAR HUB  
B
A
C
D
BRIDGE  
B
A
C
Closet 2  
BRIDGE  
B
A
C
Closet 3  
BRIDGE  
B
A
C
Figure 2-4. Configuring a Fault Tolerant Wiring Scheme  
Closets 1, 2, and 3 each contain an MMAC-FNB with an EMM-E6,  
MIMs, and RIC MIMs operating on Ethernet channels A, B, and C.  
Within each closet, each Ethernet channel is separately repeated, and each  
is dedicated to a specific set of network users (for example, Ethernet A  
contains Novell users, Ethernet B contains TCP/IP and NFS users, and  
Ethernet C contains DECnet users).  
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SAMPLE NETWORK CONFIGURATIONS  
The Star Hub, which is an MMAC-FNB that uses a configuration similar  
to the closet hubs, is the central repeater interconnect for the closets, but  
does not constitute a single point of failure.  
The EMM-E6 in each MMAC-FNB utilizes the 802.1d Spanning Tree  
Algorithm. By configuring the Root Path Cost and the Bridge Priority on  
the EMM-E6, you can bridge primary paths from each segment to  
Network D from each EMM-E6 (indicated by the solid line between  
Ethernet channel A and the bridge in closet 1, Ethernet channel B and the  
bridge in closet 2, and Ethernet channel C and the bridge in closet 3). The  
dotted lines between the other Ethernet channels and the bridge show the  
backup paths in a standby condition. If any repeater link fails, or if an  
active bridge path fails, one or many backup bridge paths may become  
active, replacing the failed repeater link or bridge path.  
An additional level of redundancy is achieved by using the cable  
redundancy algorithm built into Cabletron’s EMM-E6. This feature  
enables you to configure redundant bridge paths, with one path remaining  
in backup, standby mode until the primary path fails.  
In the example, Segment D provides a manageable backbone, using a  
MiniMMAC. Segment D provides intercommunication for channels A, B,  
and C, as well as serving as the network management segment for the  
hierarchy. The individual protocol segments are filtered by the EMM-E6  
bridge component, so that the only traffic on segment D is minimal inter-  
channel communication (i.e., mail). Otherwise, only network  
management data is on segment D, out-of-band of the traffic on channels  
A, B, and C.  
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CHAPTER 2: REQUIREMENTS / CONFIGURATIONS  
2.5.5 The EMM-E6 and BRIMs  
The example in Figure 2-5 illustrates just one possible EMM-E6 and  
BRIM configuration. The EMM-E6/BRIM combination provides various  
connection possibilities, depending on the BRIM(s) you use. Refer to  
individual BRIM manuals and/or Cabletron Systems’ Router Services  
documentation to better understand the capabilities of each device.  
FDDI Backbone  
EMM-E6  
TPMIM-24  
TPMIM-24 FORMIM-22 FORMIM-22  
CXRMIM  
TPRMIM-33  
E
Redundant  
Connectivity  
Channel A  
Channel B  
Channel C  
Channel D  
Ethernet  
Backbone  
Figure 2-5. The EMM-E6 and BRIMs  
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CHAPTER 3  
INSTALLATION  
This chapter contains instructions for:  
• unpacking and inventorying the contents of the EMM-E6 carton  
• locating, identifying and setting the EMM-E6 mode switches  
• adding/replacing optional modules (i.e., Single In-line Memory  
Modules and Ethernet Port Interface Modules)  
• identifying BRIM connector locations  
• installing the EMM-E6 into a Multi Media Access Center (MMAC)  
• connecting your device to a network.  
NOTE  
For information on how to install an optional BRIM, refer to  
your specific BRIM documentation.  
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CHAPTER 3: INSTALLATION  
3.1 UNPACKING THE EMM-E6  
Unpack the EMM-E6 as follows:  
Observe all anti-static precautions when handling  
sensitive electronic equipment.  
!
CAUTION  
1. Remove the shipping material covering the EMM-E6.  
2. Verify the contents of the packing carton. The carton is shipped with  
the following items:  
Item  
Quantity  
EMM-E6  
1
1
1
1
1
Firmware Image  
Grounding Strap  
RJ45 Adapter Kit  
Release Notes  
3. Carefully remove the module from the shipping box. Leave the  
module in its non-conductive bag until you are ready to install it.  
4. Visually inspect the module. If there are any signs of damage, contact  
Cabletron Systems Technical Support immediately.  
5. Place the static grounding strap properly on your wrist before opening  
the non-conductive bag.  
6. Open the non-conductive bag by tearing the black and yellow tape  
seal.  
Do not cut the bag open, as damage to the module could  
occur.  
!
CAUTION  
7. Perform a second visual inspection of the module.  
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SETTING MODE SWITCHES  
3.2 SETTING MODE SWITCHES  
The bank of dip switches located at the top of the EMM-E6 (Figure 3-1)  
are set to their default positions prior to shipping. Check these switches to  
ensure that they are in the correct position for normal EMM-E6 operation.  
Switches  
EMM-E6  
ON  
On  
Off  
1
2
3
4
5
6
7
8
Figure 3-1. EMM-E6 Mode Switches  
The potential for electric shock is present inside the MMAC  
chassis when power is applied. Do not adjust switch settings  
when the EMM-E6 is within a powered MMAC enclosure.  
Failure to comply could result in personal injury and/or  
equipment damage.  
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CHAPTER 3: INSTALLATION  
Changes to switch positions only activate their associated  
functions after the EMM-E6 is reset.  
NOTE  
Switch definitions are as follows:  
• Switch 1 - Cabletron Systems use only.  
• Switch 2 - Cabletron Systems use only.  
• Switch 3 - For manufacturing use only. Keep in OFF position.  
• Switch 4 - MIMREV (Management Interface Module Revision).  
This switch remains in the OFF position for normal operation. Only  
if you are using THN-MIM part numbers 9000043-05 and below in  
your MMAC-FNB should the switch be in the ON position.  
• Switch 5 - Baud Rate Default. Allows you to set the Console port’s  
baud rate. The OFF position sets the baud rate to 9600. The ON  
position sets the baud rate to 2400.  
•
Switch 6 - Forced Download. Changing the state of this switch  
(i.e., moving the switch from one position to another) clears  
download information from NVRAM and forces the EMM-E6 to  
download an image file from the station acting as the EMM-E6’s  
BOOTP server.  
Do NOT change the state of Switch 6 unless you:  
NOTE  
-
-
have a station acting as a BOOTP server, and  
that station contains the EMM-E6 image file.  
intend to set up a station to act as a BOOTP  
server for the EMM-E6.  
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SETTING MODE SWITCHES  
After changing the state of Switch 6 and repowering the device, the  
EMM-E6 will request a new image until it either receives the image,  
or you reset the EMM-E6 again by:  
-
-
using the reset button on the front panel  
removing the EMM-E6 from the chassis backplane and  
plugging it back in  
-
cycling the MMAC-FNB power.  
After resetting the EMM-E6, the device attempts to locate a BOOTP  
server again. However, the BOOTP request times out after about one  
minute, and the EMM-E6 boots from FLASH memory.  
•
Switch 7 - NVRAM (Non-Volatile RandomAccess Memory) Reset.  
The EMM-E6 uses NVRAM to store user entered parameters such  
the IP address, device name, etc. Changing the state of this switch  
(i.e., moving the switch from one position to another) and executing  
a reset of the module resets these parameters to the factory defaults.  
Once the EMM-E6 resets, you can either use the defaults or re-enter  
your own parameters. The EMM-E6 stores these parameters in  
NVRAM when the device powers down. These parameters remain  
in NVRAM until the switch changes state again.  
Do not change the state of Switch 7 unless you intend to reset  
NOTE  
the EMM-E6 user parameters to the factory default settings.  
•
Switch 8 - Password Defaults. Changing the state of this switch  
clears user-entered passwords in NVRAM, and restores factory  
default passwords. Once you reset the EMM-E6, you can use the  
defaults or re-enter your own passwords.  
Do not change the state of Switch 8 unless you intend to reset  
the EMM-E6 user-configured passwords to their factory  
default settings.  
NOTE  
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CHAPTER 3: INSTALLATION  
3.3 SIMM UPGRADES  
The EMM-E6 allows memory upgrades for SDRAM, LDRAM, and  
FLASH EEPROM. This section explains how to locate and add or replace  
a Single In-line Memory Module (SIMM) for any of these memory types.  
For additional information on SIMMs, or how to upgrade the  
NOTE  
memory in your Module, contact Cabletron Systems  
Technical Support.  
3.3.1 Locating SIMMs  
Each memory type has a specific SIMM slot location on the EMM-E6  
mother board. When installing SIMM boards, make sure that you place  
them in their proper slots. Figure 3-2 illustrates the EMM-E6 SIMM slot  
locations and the direction in which to install the SIMMs.  
The LDRAM SIMM slot is shipped with an expansion SIMM  
NOTE  
located in it. If you are performing an upgrade to LDRAM,  
ensure that the upgrade SIMM is placed in the proper SIMM  
slot after removing the existing LDRAM SIMM. LDRAM  
SIMM modules placed in the lower SDRAM slot will not  
provide additional main memory. For further information on  
the uses and types of memory in the EMM-E6, please refer to  
Chapter 1.  
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SIMM UPGRADES  
Local Dynamic Random Access Memory (LDRAM) SIMM Slot  
FLASH Memory SIMM Slot  
Direction  
of  
Install  
EMM-E6  
Shared Dynamic Random Access Memory (SDRAM) SIMM Slot  
Figure 3-2. SIMM Slot Locations  
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CHAPTER 3: INSTALLATION  
3.3.2 Installing SIMMs  
Installing a SIMM is a simple two step process. After finding the proper  
SIMM slot location, refer to Figure 3-3 and the following instructions to  
install your SIMM.  
SIMM Slot  
Connector  
Teeth  
Clips  
1
SIMM Slot  
Post  
2
SIMM  
SIMM Hole  
Figure 3-3. Installing a SIMM  
To install a SIMM:  
Observe all anti-static precautions when handling  
sensitive electronic equipment.  
!
CAUTION  
1. Insert the SIMM between the connector teeth in the SIMM slot.  
2. Pivot the SIMM back until it locks into the clips in the SIMM slot,  
and the SIMM holes fit over the SIMM slot posts.  
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ADDING/REPLACING EPIMs  
3.4 ADDING/REPLACING EPIMs  
This section contains procedures on how to add/replace an Ethernet Port  
Interface Module (EPIM) to upgrade or change the capabilities of your  
hub. After installing your new EPIM, refer to appropriate EPIM sections  
in this chapter to verify proper operation.  
Observe all anti-static precautions when handling  
sensitive electronic equipment.  
!
CAUTION  
To install an EPIM:  
When removing an EPIM, make sure to pull the module  
straight out so as not to damage the connector.  
NOTE  
1. Remove the coverplate or the EPIM (whichever applies).  
2. Slide your new EPIM into place, making sure the connectors on the  
rear of the module and inside the hub attach properly.  
3. Install the mounting screw.  
Mounting  
Screw  
RCV  
XMT  
CLN  
E
P
I
M
1
E
EPIM  
E
P
EMM-E6  
I
M
2
Figure 3-4. Installing an EPIM  
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CHAPTER 3: INSTALLATION  
3.5 LOCATING BRIMs  
This section points out Bridge Router Interface Module (BRIM)  
connector locations on your EMM-E6 board. Refer to your BRIM Guide  
for installation procedures and additional information.  
The following diagram (Figure 3-5) shows BRIM connector locations for  
the EMM-E6:  
Channel E BRIM Connector  
BRIM-F Ribbon Cable Connector  
Channel F BRIM Connector  
Standoff  
EMM-E6  
Figure 3-5. BRIM Connector Locations  
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PRE-INSTALLATION TEST  
3.6 PRE-INSTALLATION TEST  
Before installing the EMM-E6 in a live network, test the module in a  
controlled situation to ensure that it is repeating and bridging packets.You  
can perform this test with two workstations (see Figure 3-6), using an  
MMAC-FNB, or MMAC-MFNB, installed with an EMM-E6 and a Media  
Interface Module (MIM) as follows:  
1. Install the EMM-E6 and any MIM (e.g., TPMIM, THN-MIM,  
CXRMIM, FORMIM, etc.) into a non-networked MMAC.  
2. Connect the first workstation to an EMM-E6 EPIM or BRIM.  
3. Connect the second workstation to the MIM using the appropriate  
cable or transceiver.  
4. Assign the EMM-E6 a valid IP address through Local Management.  
5. Designate the first workstation as a file server and the second one as  
the client (refer to the workstation manuals for establishing one as a  
file server and one as a client.).  
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CHAPTER 3: INSTALLATION  
6. Send packets between the two workstations to verify the proper  
operation of the EMM-E6.  
Note: If using UNIX workstations, a “ping” test verifies the  
EMM-E6 is operating properly.  
NOTE  
If a failure occurs, refer to Chapter 14, Troubleshooting.  
t
T
                                                                   -
MMAC-M3FNB  
E
6
TPT  
Figure 3-6. Pre-Installation Test  
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INSTALLING THE EMM-E6  
3.7 INSTALLING THE EMM-E6  
Installing the EMM-E6 into any MMAC hub is an easy operation and  
requires no special skills or tools. However, when you install your device,  
keep the following in mind:  
Any installation operations should be performed only by  
qualified personnel  
• You must install the EMM-E6 in slots 1 and 2 (furthest slots to the  
right) of the MMAC chassis.  
• Position RIC MIMs contiguously in any MMAC-FNB series hub,  
from right to left. This ensures that the channels do not act in a stand-  
alone manner or desegment from the B or C channel. This does not  
apply to shunting MMAC-FNBs, where the data path remains  
unbroken, and allows non-interrupted communication.  
Install the EMM-E6 into the MMAC-FNB (backplane) as follows:  
We recommend powering down your MMAC when inserting  
or removing boards, even though Cabletron Systems modules  
NOTE  
have “hot swap” capabilities.  
1. Remove the safety bars which protect the chassis and remove any  
module to be replaced or blank MMAC slot covers in accordance  
with the installation and removal procedures for these items.  
2. Holding the EMM-E6 by the edges of the board, align the bottom and  
top edges of the board with the slot guides. Make sure that both the  
bottom and top edges of the card rest in the guide slots.  
3. Slide the EMM-E6 (Figure 3-7) into slots 1 and 2 (furthest right slots)  
of the MMAC card cage. Make sure that the module aligns properly  
in the top and bottom slot guides.  
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4. Firmly press the module connections into the backplane. Do not try to  
force the module into place or use the knurled knobs to draw the  
module into the backplane. Forcing a misaligned module into place  
can damage the EMM-E6 or the MMAC backplane.  
MMAC M8FNB  
EMM-E6  
EMM-E6  
Knurled Knobs  
Chassis Slots 1 and 2  
Figure 3-7. Installing the EMM-E6  
5. Secure the module to the MMAC chassis by tightening the knurled  
knobs. If you do not tighten the knurled knobs, vibration can cause  
the module to lose contact with the backplane and disrupt your  
network.  
7. Re-install the MMAC chassis safety bars.  
6. Power-up the MMAC (if it isn’t already ON).  
It takes several minutes for the EMM-E6 to boot up. While  
booting, the EMM-E6 displays boot-up diagnostics on Local  
NOTE  
Management. Refer to Chapters 4 and 5 for additional  
information on how to connect and configure a Local  
Management console.  
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INSTALLING THE EMM-E6  
7. Observe the status of the LANVIEW LEDs on the EMM-E6. When  
the CPU LED is flashing, the STBY (standby) LEDs indicate the  
module’s boot state. During this period (up to 5 minutes), the LEDs  
cycle through a series of internal diagnostics. (See Figure 3-8)  
EMM-E6  
SN  
RESET  
CPU  
D
C
B
A
STBY  
RCV  
XMT  
CLN  
Figure 3-8. EMM-E6 LANVIEW LEDs  
8. After the system boot procedure, the LEDs should be in the following  
conditions:  
• CPU LED flashing, indicating proper EMM-E6 operation.  
• STBY (A, B, C, D) LEDs ON or OFF, depending on the port’s  
position in the Spanning Tree Algorithm.  
• Appropriate EPIM/BRIM LEDs ON (see section 3.9, Connecting  
to the Network, to obtain the appropriate LED status for individual  
EPIMs; refer to individual BRIM Guides).  
• ON LED lit for the active channel D EPIM.  
If the LEDs are not operating in the fashion described above, refer  
immediately to Chapter 14, Troubleshooting.  
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CHAPTER 3: INSTALLATION  
3.8 INSTALLATION CHECK-OUT  
After connecting to the network, verify that packets can pass over the  
network segments via the EMM-E6. Again, you can use two workstations  
set up as file server and client. Keep the server workstation stationary in  
the wiring closet with the EMM-E6, and use the client workstation to  
move to each node connected to the EMM-E6. See Figure 3-9.  
1. After the EMM-E6 is installed in the MMAC, connect the server  
workstation to either a MIM or to the EMM-E6 via an EPIM or BRIM.  
2. Going to each node connected to the MMAC, connect the client  
workstation and test the segment.  
If a failure occurs, refer to Chapter 14, Troubleshooting.  
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INSTALLATION CHECK-OUT  
MMAC-M3FNB with EMM-E6 and TPRMIM  
t
T
3
MMAC-M3FNB  
EMM-  
TPT  
Office Locations  
File Server Workstation  
Client Workstation  
Figure 3-9. Installation Checkout  
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CHAPTER 3: INSTALLATION  
3.9 CONNECTING TO THE NETWORK  
This section gives procedures for connecting the EMM-E6 to the network  
using the various EPIMs available. When the EMM-E6 is first powered up,  
the EPIM 1 port acts as the bridge port and the EPIM 2 port is OFF.  
Once you have successfully powered up your EMM-E6, you can add  
network connections. The procedure for connecting Ethernet segments to  
a hub varies depending on the media and ports you connect. Refer to the  
following list and perform the procedure described in the subsection(s)  
that apply to your hub:  
•
•
•
•
•
EPIM-T  
EPIM-X  
EPIM-F1,F2,F3  
EPIM-C  
EPIM-A  
3.9.1  
3.9.2  
3.9.3  
3.9.4  
3.9.5  
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CONNECTING TO THE NETWORK  
3.9.1 Connecting a Twisted Pair Segment to an EPIM-T  
Before connecting a segment to the EPIM-T, check each end of the  
segment to determine wire cross-over. If the wires do not cross over, use  
the switch on the EPIM-T to internally cross over the RJ45 port. Refer to  
Figure 3-10 to properly set the EPIM-T cross-over switch.  
To establish link, you must have an odd number of cross-overs  
(preferably one) between 10BASE-T devices of the same type  
NOTE  
(i.e., from repeater to repeater or transceiver to transceiver).  
Position X  
(crossed over)  
1. RX+  
2. RX-  
3. TX+  
4. NC  
5. NC  
6. TX-  
7. NC  
8. NC  
Position =  
(not crossed over)  
1. TX+  
2. TX-  
3. RX+  
4. NC  
5. NC  
6. RX-  
7. NC  
8. NC  
Figure 3-10. EPIM-T Cross-over Switch  
To connect an EPIM-T to a Twisted Pair Segment:  
1. Connect the twisted pair segment to the module by inserting the RJ45  
connector on the twisted pair segment into the RJ45 port on the  
module. (See Figure 3-10.)  
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CHAPTER 3: INSTALLATION  
2. Check that the LNK LED for the port is on. If the LED is not on,  
perform each of the following steps until it is:  
a. Check that the 10BASE-T device at the other end of the twisted  
pair segment is powered.  
b. Verify that the RJ45 connectors on the twisted pair segment have  
the proper pinouts (Figure 3-11).  
c. Check the cable for continuity.  
d. Check that the twisted pair connection meets dB loss and cable  
specifications outlined in 10BASE-T Twisted Pair Network  
Requirements (Chapter 2).  
10BASE-T Device  
Port  
EPIM-T  
Port  
RX+  
1
2
1
2
TX+  
TX–  
RX–  
NOTE:  
RX+/RX– and TX+/TX–  
must share a common  
color pair.  
RJ -45 to RJ -45  
3
6
3
6
TX+  
TX–  
RX+  
RX–  
Figure 3-11. Cable Pinouts - EPIM-T RJ45 Port  
If you still cannot establish link, contact Cabletron Technical Support.  
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CONNECTING TO THE NETWORK  
3.9.2 Connecting an AUI Cable to an EPIM-X  
The Signal Quality Error (SQE) switch remains in the OFF  
position for most network connections. However, some Data  
Terminal Equipment (DTE) requires SQE. Refer to your DTE  
manual for SQE requirement information.  
NOTE  
To connect an EPIM-X to a device not requiring SQE:  
1. Verify that the SQE LED on the EPIM-X is off. If the SQE LED is  
on, set the position of the SQE switch to off.  
If the SQE light remains on, even though the SQE switch is in  
NOTE  
the OFF position, contact Cabletron Technical Support.  
2. Attach one end of an AUI cable, no longer than 50 meters in length, to  
the port located on the EPIM-X (Figure 3-12) and the other end to the  
intended node.  
ON  
ON Position  
(Toward Back  
OFF  
of EPIM)  
OFF Position  
(Toward Front  
of EPIM)  
Figure 3-12. The EPIM-X  
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CHAPTER 3: INSTALLATION  
3.9.3 Connecting to an EPIM-F1/F2, or EPIM-F3  
When connecting a fiber optic link segment to an EPIM-F1/F2, or  
EPIM-F3 keep the following in mind:  
• When connecting a fiber optic link segment with SMA 906  
connectors to an EPIM-F1 with SMA ports, make sure each  
connector uses half alignment, NOT full alignment, sleeves.  
A full alignment sleeve damages the receive port. SMA 905  
connectors do not need alignment sleeves.  
NOTE  
• When connecting a fiber optic link segment with ST connectors to  
an EPIM-F2 with ST ports, keep in mind that ST connectors attach  
to ST ports much like BNC connectors attach to BNC ports. Insert  
the connector into the port with the alignment key on the connector  
inserted into the alignment slot on the port. Turn the connector to  
lock it down.  
• The physical communication link consists of two strands of fiber  
optic cabling: the Transmit (TX) and the Receive (RX). The  
Transmit strand from a module port connects to the Receive port of  
a fiber optic Ethernet device at the other end of the segment (i.e., TX  
of the applicable port on the module goes to RX of the other fiber  
optic device). The Receive strand of the applicable port on the  
module connects to the Transmit port of the fiber optic Ethernet  
device (i.e., RX of the applicable port on the module goes to TX of  
the other fiber optic device).  
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CONNECTING TO THE NETWORK  
We recommend that you label the fiber optic cables to indicate  
Receive and Transmit ends. Cabletron Systems prelabels its cable.  
At one end of the cable, one fiber is labeled 1, and the other fiber is  
labeled 2. This pattern repeats at the other end of the cable. If you  
did not purchase your cable from Cabletron Systems, be sure to label  
your cable in this manner.  
Do not touch the ends of the fiber optic strands, and do not let  
the ends come in contact with dust, dirt, or other  
contaminants. Contamination of cable ends causes problems  
in data transmissions. If necessary, clean contaminated cable  
ends using alcohol and a soft, clean, lint-free cloth.  
!
CAUTION  
To connect a fiber optic link segment to an EPIM-F1/F2 or an EPIM-F3:  
1. Remove the protective plastic covers from the fiber optic ports on the  
applicable port on the module, and from the ends of the connectors on  
each fiber strand.  
2. On the EMM-E6, attach the fiber labeled 1 to the applicable receive  
port, labeled RX (Figure 3-13).  
3. On the EMM-E6, attach the fiber labeled 2 to the applicable transmit  
port, labeled TX.  
4. At the other end of the fiber optic cable, attach the fiber labeled 1 to  
the transmit port of the device and the fiber labeled 2 to the receive  
port.  
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CHAPTER 3: INSTALLATION  
F1/F2  
ST Connectors  
F1/F2  
SMA 906 Connectors w/  
Half Alignment Sleeves  
SMA 905 Connectors  
F3  
ST Connectors  
Figure 3-13. The EPIM-F1/F2 and EPIM-F3  
5. Check that the LNK LED on the applicable module port is on. If the  
LED is not on, perform each of the following steps until it is:  
a. Check that the device at the other end of the link is powered.  
b. Verify proper “cross-over” of fiber strands between the applicable  
port on the module and the fiber optic device at the other end of  
the fiber optic link segment.  
c. Verify that the fiber connection meets the dB loss specifications  
outlined in Fiber Optic Network Requirements (Chapter 2).  
If you still cannot establish link, contact Cabletron Technical Support.  
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CONNECTING TO THE NETWORK  
3.9.4 Connecting a Thin-Net Segment to an EPIM-C  
To connect a thin-net segment to an EPIM-C:  
1. Set the Internal Termination Switch (Figure 3-14), located above the  
port (when the EPIM has been inserted into the EMM-E6) and  
labeled TERM to:  
• the ON position ( ) to internally terminate the thin-net segment at  
the port.  
• the OFF position ( ) if you do not want the thin-net segment to  
internally terminate at the port.  
2. If the Internal Termination Switch is in the On position, connect the  
thin-net segment directly to the BNC port.  
3. If the Internal Termination switch is in the Off position:  
a. Attach a BNC T-connector to the BNC port on the module.  
b. Attach the thin-net segment to one (1) of the female connectors on  
the T-connector.  
Failure to terminate each T-connector segment may result in  
improper segment operation. Place a terminator on any open  
female connection on the T-connector.  
!
CAUTION  
c. Attach another thin-coaxial segment or a terminator to the other  
female connector on the T-connector.  
Connecting a thin-net segment to earth ground at more than  
one point could produce dangerous ground currents.  
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CHAPTER 3: INSTALLATION  
When internal termination switch  
is set to off ( ):  
Connect BNC T-connector to port.  
Attach a terminator or terminated  
thin-net segment to one female  
connector of tee-connector.  
Connect a terminated thin-net  
segment to other female connector  
of T-connector.  
Attach thin-net segment directly to BNC  
connector when internal termination  
switch is set to on ( ).  
Figure 3-14. The EPIM-C  
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CONNECTING TO THE NETWORK  
3.9.5 Connecting an AUI Cable to an EPIM-A  
Ensure that the external transceiver to which you connect the  
EPIM-A does not have the Signal Quality Error (SQE or  
“heartbeat”) test function enabled. The EPIM does not  
operate if the transceiver has the SQE test function enabled.  
Refer to the applicable transceiver manual for additional  
information.  
NOTE  
To connect an EPIM-A to an external network segment:  
1. Check that the PWR LED on the EPIM-A is on. If the PWR LED is  
not on, contact Cabletron Systems Technical Support.  
2. Attach an external transceiver to the network segment intended for  
AUI port connection. For additional information, refer to the  
applicable transceiver manual.  
3. Attach an AUI cable, no longer than 50 meters in length, to the  
transceiver you connected to the network in step 2.  
4. Connect the AUI cable to the AUI port located on the EPIM-A. (See  
Figure 3-15.)  
Figure 3-15. The EPIM-A  
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CHAPTER 3: INSTALLATION  
5. Lock the AUI connector into place using the connector slide latch.  
6. If the transceiver PWR LED is off with the AUI cable connected:  
a. Check the AUI connections for proper pinouts. Appendix A lists  
the pinouts for the transceiver connection.  
b. Check the cable for continuity.  
c. Reconnect the AUI cable to the EMM-E6 and the device.  
If the transceiver PWR LED remains off, contact Cabletron Systems  
Technical Support.  
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CHAPTER 4  
ATTACHING A CONSOLE  
This chapter describes how to attach a Local Management console to the  
EMM-E6, and lists the setup and configuration requirements for:  
•
•
•
console/terminal  
console cable  
console cable connections.  
4.1 CONFIGURING YOUR TERMINAL  
The following instructions outline how to configure your console  
(terminal) to communicate with Local Management. Refer to your  
specific terminal manual for more instructions if necessary.  
To access Local Management for the EMM-E6, you need either:  
•
•
a VT200 or VT300 series terminal  
a PC emulating a VT200 or VT300 series terminal.  
To access the Setup Directory on a VT series terminal, press F3. The  
following table lists the required terminal setup for a VT series terminal.  
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CHAPTER 4: ATTACHING A CONSOLE  
Table 4-1. VT Terminal Setup  
Display Setup Menu  
Columns .......................... ->  
80 Columns  
Controls ........................... ->  
Auto Wrap ........................ ->  
Scroll................................ ->  
Text Cursor....................... ->  
Cursor Style..................... ->  
Interpret Controls  
No Auto Wrap  
Jump Scroll  
Cursor  
Underline Cursor Style  
General Setup Menu  
Mode................................ ->  
ID number........................ ->  
Cursor Keys ..................... ->  
Power Supply................... ->  
VT300, 7 Bit Controls  
VT320ID or VT100ID  
Normal Cursor Keys  
UPSS DEC Supplemental  
Communications Setup Menu  
Transmit ........................... ->  
Receive............................ ->  
XOFF ............................... ->  
Bits................................... ->  
Parity................................ ->  
Stop Bit ............................ ->  
Local Echo....................... ->  
Port .................................. ->  
Transmit ........................... ->  
Auto Answerback ............. ->  
Transmit=9600  
Receive=Transmit  
XOFF at 64  
8 bits  
No Parity  
1 Stop Bit  
No Local Echo  
DEC-423, Data Leads Only  
Limited Transmit  
No Auto Answerback  
Keyboard Set-up Menu  
Keys................................. ->  
Auto Repeat..................... ->  
Keyclick............................ ->  
Margin Bell....................... ->  
Warning Bell .................... ->  
Typewriter Keys  
any option  
any option  
Margin Bell  
Warning Bell  
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CONFIGURING A CONSOLE CABLE  
4.2 CONFIGURING A CONSOLE CABLE  
This section outlines the proper cable configurations for connecting the  
EMM-E6 to a Local Management terminal. For information on the  
appropriate pinouts, refer to Appendix A of this User’s Guide.  
You need the following hardware (supplied with your EMM-E6) to  
connect the EMM-E6 to a terminal:  
•
•
•
an RS232 cable  
an adapter  
a device cable  
The adapter you use depends on whether you connect to LM from a VT  
series terminal, or a VT-emulating PC. Read the information included  
with the cable kit to make sure you are using the right adapter.  
To configure the cables:  
1. Plug a straight-through twisted pair cable (e.g., an RS232 cable) into  
the EMM-E6 RJ45 COM 2 Port.  
Do not attempt to utilize the COM 1 port for Local  
Management, as the COM 1 port is intended to be used for  
NOTE  
monitoring an Uninterruptible Power Supply (UPS). The  
method for configuring the COM 1 port for this purpose is  
described later in this chapter.  
2. Plug the other end of the RS232 cable into the adapter.  
3. Connect the adapter into the device cable and plug the other end of the  
device cable into the terminal or terminal emulator. Detailed  
descriptions of this process for VT terminals or terminal-emulating  
PCs follow.  
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CHAPTER 4: ATTACHING A CONSOLE  
4.2.1 Connecting to a VT Series Terminal  
To connect a VT Series terminal to a Cabletron module Console port  
(Figure 4-1):  
1. Connect the RJ45 connector at one end of the cable to the Console port  
on the Cabletron module.  
2. Plug the RJ45 connector at the other end of the cable into the RJ45 to  
DB25 female adapter.  
3. Connect the DB25 adapter to the port labeled COMM on the VT  
terminal.  
VT S
 
i T
 
i l  
Figure 4-1. Connecting a VT Series Terminal  
4. Turn on the terminal and access the Setup Directory. Follow the  
directions in the previous section and set up yourVT terminal to match  
the configuration given in Table 4-1.  
5. When these parameters are set, the Local Management password  
screen will appear. Refer to Chapter 5, Accessing Local Management.  
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CONFIGURING A CONSOLE CABLE  
4.2.2 Connecting to an IBM PC or Compatible  
To connect an IBM PC or compatible running VT terminal emulation to a  
Cabletron module Console port (Figure 4-2):  
1. Connect the RJ45 connector at one end of the cable to the Console port  
on the Cabletron module.  
2. Plug the RJ45 connector at the other end of the cable into the RJ45 to  
DB9 adapter.  
3. Connect the DB9 adapter to the communications port on the PC.  
PC  
Figure 4-2. Connecting an IBM PC or Compatible  
4. Turn on the PC and configure yourVT emulation package to match the  
configuration given in Table 4-1.  
5. When these parameters are set, the Local Management password  
screen will appear. Refer to Chapter 5, Accessing Local Management.  
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CHAPTER 4: ATTACHING A CONSOLE  
4.3 PINOUT DESCRIPTIONS  
Table 4-2. RJ45 to DB9 Adapter (PC Adapter):  
RJ45  
DB9  
Pin  
1
Color  
Pin  
2
Description  
Receive  
Blue  
Red  
4
3
Transmit  
5
Green  
Orange  
Yellow  
5
Ground  
2
7
Send Request  
Clear to Send  
6
8
Table 4-3. RJ45 to DB25 Adapter (VT Series Adapter):  
RJ45  
DB25  
Pin  
4
Color  
Pin  
2
Description  
Red  
Blue  
Transmit  
1
3
Receive  
6
Yellow  
Green  
Orange  
5
Clear to Send  
Ground  
5
7
2
20  
Terminal Ready  
4.4 CONFIGURING A UPS CABLE  
To configure an Uninterruptible Power Supply (UPS) cable:  
1. Plug a straight-through twisted pair, RS232, cable into the EMM-E6  
RJ45 COM 1 Port.  
2. Plug the other end of the RS232 cable into the adapter (PN 9372066)  
and connect the adapter to the UPS.  
3. Set COM 1 in the LM Configuration screen to UPS. Refer to  
Chapter 7, Configuration Screen, for additional information  
regarding UPS connection.  
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CHAPTER 5  
ACCESSING LOCAL MANAGEMENT  
With your terminal properly configured, and the correct physical cable  
connections in place, you can access the Local Management interface.  
To access Local Management:  
1. Turn the terminal on, and press the Return key. The EMM-E6  
Password Screen, Figure 5-1, appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
Cabletron Systems Incorporated  
35 Industrial Way, P.O. Box 5005  
Rochester, NH 03867-0505 U.S.A.  
(603) 332-9400  
(c) Copyright Cabletron Systems, Inc. 1994  
EMM-E6-960 F/W Version: 0.00.00  
Boot PROM Version: 00.00.00  
EMM-E6-960 Board Rev#: 00.00.00  
Enter USER PASSWORD:  
Figure 5-1. EMM-E6 Password Screen  
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CHAPTER 5: ACCESSING LOCAL MANAGEMENT  
2. Enter your Password and press Return. The default Super-User  
access password is the Return key (which defaults internally to  
‘public’).  
Your password is one of the community names specified in the  
Community Name Table. Access to certain LM capabilities  
NOTE  
depends on the degree of access accorded that community  
name. See Chapter 6, Community Names, for additional  
information.  
•
•
If you enter an invalid password, the EMM-E6 ignores the entry, and  
the cursor returns to the beginning of the password entry field.  
After entering a valid password, an associated access level flashes  
across the bottom of the screen, and then the Feature Selection  
Screen, Figure 5-2, appears.  
Entering 10 incorrect passwords in a row causes an access  
violation. In such an event, the EMM-E6 disconnects from the  
network and requires a reset to continue operation.  
NOTE  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
FEATURE SELECTION  
F6 COMMUNITY NAME TABLE  
F7 IPADDRESS ASSIGNMENT  
F8 COMPONENT TRAP TABLE  
F9 SNMP TOOL SUPPORT  
F10 MIB NAVIGATOR  
F14 ROUTER SETUP  
DEVICE STATISTICS  
EXIT LIM SERVICE  
Figure 5-2. Feature Selection Screen  
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3. Use the arrow keys to highlight an option, and press Return (or simply  
use the corresponding Function key). The selected screen appears.  
If you do nothing on LM for 15 minutes, the Password Screen reappears.  
At this point, you must re-enter the password to continue using EMM-E6  
Local Management.  
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CHAPTER 6  
COMMUNITY NAMES  
The Community Name Table option lets you set Local Management  
community names. These names act as passwords to LM and provide  
security for your EMM-E6. You can control EMM-E6 access by  
establishing up to four different levels of security authorization - basic  
read-only, read-only, read-write, and super-user.  
Super-user access gives you full management privileges and allows you to  
change existing passwords and edit all modifiable MIB objects for the  
EMM-E6 and additional Bridge/Router Interface Modules (BRIMs).  
6.1 ACCESSING THE COMMUNITY NAME TABLE  
To access the Community Name Table Screen:  
1. From the Feature Selection Screen, use the arrow keys to highlight the  
Community Name Table option, and press the Return key. The  
Community Name Table Screen, Figure 6-1, appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
COMMUNITY NAME TABLE  
<< PASSWORD AUTHORIZATION = SUPER-USER >>  
NOTE: S/U names are LOCAL passwords  
Community Name  
Access  
public  
public  
public  
public  
BASIC-READ  
READ-ONLY  
READ-WRITE  
SUPER-USER  
SAVE  
F6  
IP TABLE  
F7  
TRAP TABLE  
F8  
SNMP TOOLS  
F9  
CLI  
F10  
RETURN  
Figure 6-1. Community Name Table Screen  
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CHAPTER 6: COMMUNITY NAMES  
6.2 COMMUNITY NAME TABLE SCREEN FIELDS  
This section briefly explains each Community Name Table Screen field.  
Community Name  
Displays the community name through which a user can access LM. All  
community names act as passwords to Local Management. Depending on  
the assigned access, community names can vary in privileges.  
Access  
Indicates the privileges accorded each community name. Possible  
selections are:  
BASIC-READ The community name corresponding to this status  
has limited read-only access to the EMM-E6 and  
does not include access to security protected fields  
requiring a higher-level of authorization (read-only,  
read-write, or super-user).  
READ-ONLY  
This allows for extended read-only access to  
EMM-E6/LM fields, and excludes access to  
security protected fields of read-write or super-user  
authorization.  
READ-WRITE This allows you to read and write to EMM-E6/LM  
fields, excluding fields security protected for super-  
user access only.  
SUPER-USER This access status gives the user read-write access  
to the EMM-E6/LM and allows changes to be made  
to all modifiable parameters including: community  
names, IP addresses, traps, and SNMP objects.  
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ESTABLISHING COMMUNITY NAMES  
6.3 ESTABLISHING COMMUNITY NAMES  
In order for any Community Name Table edits to take effect, you must  
have super-user access. In other words, when you log into LM, you must  
do so with a super-user password. A password from any of the other levels  
of access (basic-read, read-only, or read-write) does not allow you to edit  
the Community Name Table Screen.  
Any community name assigned in the Community Name Table  
is a password to its corresponding level of LM access. These  
NOTE  
names are case sensitive. The community name assigned  
super-user access is the only one that gives you complete  
access to LM. Remember this name.  
Establishing community names:  
1. Use the arrow keys to highlight the Community Name field adjacent  
to the access level of your choice.  
2. Enter the name into the field (maximum 32 characters).  
3. Press the Return key.  
4. Repeat steps 1 - 3 to modify any other community names.  
5. Use the arrow keys to highlight the Save command at the bottom of the  
screen and press the Return key. The message “SAVED OK” appears.  
The EMM-E6 saves the community names in memory, and  
implements their access modes.  
If you exit without saving, a “NOT SAVED?” message appears above  
the SAVE command. If you proceed to exit without saving, you lose  
all edits.  
6. To exit the screen use the arrow keys to highlight Return and then  
press the Return key. The Feature Selection Screen appears.  
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CHAPTER 7  
CONFIGURATION SCREEN  
In the EMM-E6 Configuration Screen you can assign an IP address and  
Subnet Mask to the EMM-E6. You can also:  
•
•
•
•
set the Default Interface  
set the Default Gateway  
override locked ports  
enable all ports.  
7.1 ACCESSING THE CONFIGURATION SCREEN  
To access the Configuration Screen:  
1. From the Features Selection Screen, use the arrow keys to highlight the  
IP Address Assignment option, and press the Return key. The  
Configuration Screen, Figure 7-1, appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
CONFIGURATION  
I/F  
1
2
3
4
CHANNEL  
IP ADDRESS  
134.204.12.91  
0.0.0.0  
0.0.0.0  
0.0.0.0  
SubNET MASK  
255.255.0.0  
0.0.0.0  
MAC ADDRESS  
00-00-1D-07-50-0E  
00-00-1D-07-50-0F  
00-00-1D-07-50-10  
00-00-1D-07-50-11  
00-00-1D-07-50-12  
A
B
C
D
E
0.0.0.0  
0.0.0.0  
0.0.0.0  
5
0.0.0.0  
Default Interface: NONE  
Default Gateway: -NONE DEFINED-  
COM 1 Application: UPS  
COM 2 Application: CONSOLE  
Baud Rate: 2400 --ACTIVE--  
Baud Rate: 9600 --ACTIVE--  
Port Lock Override: OVERRIDE DISABLED  
Port Enable Override: OVERRIDE DISABLED  
SAVE IPs  
F6  
COMMUNITY NAMES TRAP TABLE  
F7 F8  
SNMP TOOLS  
F9  
CLI  
F10  
RETURN  
Figure 7-1. Configuration Screen  
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CHAPTER 7: CONFIGURATION SCREEN  
7.2 CONFIGURATION SCREEN FIELDS  
The following briefly explains each Configuration Screen field.  
I/F  
Displays the interface number (1 to 6) corresponding to a particular  
EMM-E6 channel. This number allows the EMM-E6 to accurately  
identify MIB II channel information. The following table illustrates the  
I/F number to channel association.  
I/F  
Channel  
1
2
3
4
5
6
A
B
C
D
E
F
Channel A is the original Ethernet bus channel. Channels B & C are the  
Flexible Network Bus (FNB) channels. Channel D is an external Ethernet  
network accessed through an Ethernet Port Interface Module (EPIM).  
Channels E and F are external connections through optional BRIMs.  
Refer to Chapter 1 of this User’s Guide for a more complete description  
of channels.  
Channel E and F configuration options are dynamic. This  
means the EMM-E6 only provides options for Channels E or  
NOTE  
F if you have a BRIM module installed in one of these slots.  
IP Address  
Displays the IP address for each interface of the EMM-E6. This IP  
address will be used for the sending and receiving of SNMP data and  
should be configured for the interface with a connection to the network  
management station. If the network management station is located on a  
different network or subnet, the Default Interface and Default Gateway  
must be properly configured to allow the proper functioning of SNMP  
management.  
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CONFIGURATION SCREEN FIELDS  
SubNET Mask  
Displays the Subnet Mask for each of the six EMM-E6 channels in dotted  
decimal notation.  
MAC Address  
Displays the physical address of each bridge interface.  
Default Interface  
Displays the default interface number for the EMM-E6 default gateway.  
This field defaults to NONE.  
Default Gateway  
Displays the default gateway for the EMM-E6. You cannot use this field  
until you enter an appropriate value for the Default Interface.  
COM 1 Application  
Displays a port application setting of OFFLINE, UPS, or SLIP.  
COM 2 Application  
Displays a port application setting of CONSOLE.  
Baud Rate  
Displays the Baud Rate setting of the device attached to the EMM-E6  
through that COM port. The setting for COM 1 is 2400 or N/A; the setting  
for COM 2 is 9600.  
Port LOCK Override  
This command overrides the port locking security feature, and unlocks all  
ports in the MMAC containing the EMM-E6.  
Port ENABLE Override  
This command overrides the Port Disable feature, and enables all ports in  
the MMAC containing the EMM-E6.  
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CHAPTER 7: CONFIGURATION SCREEN  
7.3 SETTING THE HOST IP ADDRESS  
The table on the Configuration screen allows you to assign an IP address  
and Subnet Mask to the EMM-E6.  
The Host IP applies to each interface.  
NOTE  
To set the Host IP:  
1. Use the arrow keys to highlight the IP Address field.  
2. Enter the IP address into this field. The format for this entry is  
XXX.XXX.XXX.XXX, with values for XXX ranging from 0 to 254.  
The EMM-E6 rejects non-numerics, adjacent dots (periods), or an  
entry without dots separating the four XXX values.  
3. Press the Return key. The screen displays the Host IP address and  
changes any existing Subnet Mask to the default Subnet Mask for the  
IP address entered.  
4. Use the arrow keys to highlight the SAVE IPs command.  
5. Press the Return Key. At the resulting prompt, typing “Y” will cause  
the EMM-E6 to reset and load the Host IP changes into NVRAM.  
It takes approximately 35 seconds for the EMM-E6 to save  
and reset. The board is inoperable during this time. After the  
NOTE  
EMM-E6 resets, the password screen appears and you must  
re-enter Local Management.  
If you exit the Configuration Screen without saving, you lose all edits.  
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MODIFYING A SUBNET MASK  
7.4 MODIFYING A SUBNET MASK  
Consult your Network Administrator prior to modifying any  
of the natural Subnet Masks.  
NOTE  
The EMM-E6 automatically enters the natural Subnet Mask for any IP  
address that you enter. A natural Subnet Mask is a logical separation  
between network and host identifiers within the IP address. The EMM-E6  
allows you to modify this mask to best suit your needs.  
The Subnet Mask defines how your EMM-E6 treats SNMP trap IP  
destination addresses in its Trap table (see Chapter 8, Trap Table Screen,  
for additional information on traps).  
Using the Subnet Mask, the EMM-E6 logically determines one of two  
possible locations, either on or not on its own subnet, for each trap IP  
destination address in its trap table. If the address is on its own subnet, the  
EMM-E6 transmits directly to the workstation with that address. If the  
address is not on its subnet, the EMM-E6 transmits to the workstation  
with that IP address combined with the default gateway router MAC  
address.  
Use the natural Subnet Mask when:  
•
•
workstations in the Trap table reside on a different subnet (i.e.,  
across a gateway or external router), and you want these  
workstations to receive SNMP traps  
the EMM-E6 provides a natural subnet mask that fits your host/  
network identifier scheme.  
Modify the natural Subnet Mask when:  
•
workstations in the Trap table reside on a different subnet (i.e.,  
across a gateway or external router), and you want these  
workstations to receive SNMP traps  
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CHAPTER 7: CONFIGURATION SCREEN  
•
the EMM-E6 does NOT provide a natural Subnet Mask that fits your  
host/network identifier scheme.  
Make sure to modify the Subnet Mask option in conjunction  
with the Default Gateway option.  
NOTE  
To modify the Subnet Mask:  
1. Use the arrow keys to highlight the appropriate Subnet Mask field.  
2. Enter the Subnet Mask in this field in the format of  
XXX.XXX.XXX.XXX, with XXX ranging from 0 to 255.  
3. Press the Return key.  
4. Repeat steps 1 - 3 for each interface you want to modify.  
The IP Address Table now contains Subnet Mask information specific to  
your network.  
7.5 SETTING DEFAULT GATEWAY AND INTERFACE  
The Default Gateway is the IP address of the network connection (i.e.,  
gateway or another external router) used in forwarding management  
information from the EMM-E6 (e.g., SNMP traps) to a network  
management station.  
The Default Interface is the channel that the EMM-E6 uses to access the  
Default Gateway. Make sure to set the Default interface to reflect the  
correct interface channel for the Default Gateway.  
The Default Gateway field will not allow itself to be modified  
until a Default Interface has been correctly configured on the  
NOTE  
EMM-E6.  
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SETTING DEFAULT GATEWAY AND INTERFACE  
To set the Default Gateway and its associated Default Interface:  
1. Use the arrow keys to highlight the Default Interface field.  
2. Enter the interface number of the EMM-E6 for the Default Gateway in  
this field. The interface number will be a value between 1 and 6. A  
table of the interface numbers may be found in section 7.2.  
The EMM-E6 will not allow Local Management to configure  
the Default Interface to utilize an unsubscribed interface. For  
NOTE  
example: To select Interface 5 as the Default Interface, a  
BRIM module must first be configured to the E channel of the  
EMM-E6.  
3. Press the Return key. If the EMM-E6 accepts your entry as a valid  
Default Interface, it displays “Previous Default Interface Marked  
Invalid” at the top of the screen.  
4. Use the arrow keys to highlight the Default Gateway field.  
5. Enter the gateway’s IP address in this field. The format for this entry is  
XXX.XXX.XXX.XXX with values for XXX ranging from 0 to 254.  
6. Press the Return key. If the EMM-E6 accepts your entry as a valid  
Default Interface, it displays “Previous Default Interface Marked  
Invalid” at the top of the screen.  
You have now established a Default Gateway and Default Interface for  
your EMM-E6.  
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CHAPTER 7: CONFIGURATION SCREEN  
7.6 CONNECTING/DISCONNECTING A UPS  
The EMM-E6 provides the option of connecting to an Uninterruptible  
Power Supply (UPS) using Local Management.  
To enable the UPS connection using EMM-E6/LM:  
1. Use the arrow keys to highlight the COM 1 Application: field.  
2. Press the Return key until “UPS” appears in the field. This field  
toggles between “OFFLINE”, which is the default value, “UPS”, and  
“SLIP”.  
3. Use the arrow keys to highlight the COM 1 Baud Rate field.  
4. Press the Return key until “2400 Connect?” appears in the field.  
5. Use the arrow keys to highlight Connect?.  
6. Press the Return key. The request “Y/N:_” appears.  
7. Enter Y if you want to connect a UPS, or N if you do not want a UPS  
connection. Entering a Y response connects the EMM-E6 to the UPS  
and “-- Active --” appears in the Connect? field.  
8. Press the Return key.  
To disable the UPS connection using EMM-E6/LM:  
1. Use the arrow keys to highlight -- Active -- in the COM 1 field.  
2. Press the Return key. The option “Disconnect? Y/N:” appears.  
3. Enter Y if you want to disconnect a UPS, or N if you want to remain  
connected. Entering a Y response disconnects the EMM-E6 from the  
UPS. “-N/A-” will appear in the Baud Rate field, and the COM1  
Application field changes to “OFFLINE”.  
4. Press the Return key.  
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UNLOCKING PORTS  
7.7 UNLOCKING PORTS  
When you lock the chassis for security reasons (e.g., using remote inband  
management), unauthorized devices cannot communicate through an  
MMAC-FNB chassis station port. The Port LOCK Override function  
provides fail-safe recovery if you cannot unlock ports using remote  
inband SNMP.  
To use the Port LOCK Override:  
1. Use the arrow keys to highlight the Port LOCK Override field.  
2. Press the Return key. The adjacent field displays “UNLOCK ALL  
PORTS Y/N”.  
3. Enter Y to unlock all of the ports, or N to discontinue the port lock  
override. Responding with a Y unlocks all ports.  
4. Press the Return key.  
7.8 ENABLING PORTS  
The Port ENABLE Override function provides a fail-safe recovery when  
you cannot enable the chassis with remote inband SNMP.  
To use the Port ENABLE Override:  
1. Use the arrow keys to highlight the Port ENABLE Override field.  
2. Press the Return key. The adjacent field displays “ENABLE ALL  
PORTS Y/N”.  
3. Enter Y to enable all of the ports, or N to discontinue the port enable  
override. Responding with a Y enables all ports.  
4. Press the Return key.  
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CHAPTER 8  
TRAP TABLE SCREEN  
As an SNMP compliant device, the EMM-E6 can authenticate an SNMP  
request. The Trap Table defines the management stations to receive  
SNMP Traps for alarm/event notification.  
8.1 ACCESSING THE TRAP TABLE SCREEN  
To access the Trap Table Screen:  
1. From the Features Selection Screen, use the arrow keys to highlight the  
Component Trap Table option.  
2. Press the Return key. The Trap Table Screen, Figure 8-1, appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
TRAP TABLE  
Trap IPAddress  
SNMP Community Name  
Traps  
ctron  
Mike  
Joe  
Randy  
Jerry  
Chris  
Scott  
<CR>  
132.177.118.24  
132.177.118.25  
132.177.118.26  
0.0.0.0  
0.0.0.0  
0.0.0.0  
N
Y
N
N
N
N
N
N
0.0.0.0  
0.0.0.0  
SAVE  
F6  
COMMUNITY NAMES  
F7  
IP TABLE  
F8  
SNMP TOOLS  
F9  
CLI  
F10  
RETURN  
Figure 8-1. Trap Table Screen  
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CHAPTER 8: TRAP TABLE SCREEN  
8.2 TRAP TABLE SCREEN FIELDS  
The Trap Table contains three modifiable fields. The fields, shown in  
Figure 8-1, allow the user to direct trap information to users on the  
network. The three fields are:  
SNMP Community Name  
Displays the community name associated with the network  
management station IP address to which the EMM-E6 sends trap  
messages.  
Traps  
Displays whether or not the EMM-E6 sends traps to the network  
management station with the associated IP address.  
Trap IP Address  
Indicates the IP address of the workstation to receive trap alarms from  
the EMM-E6.  
8.3 CONFIGURING THE TRAP TABLE  
1. Using the arrow keys, highlight the SNMP Community Name field.  
2. Enter the community name that reflects the desired access level  
(e.g., the community name associated with the SUPER-USER access  
level) for SNMP trap information.  
While any of the community names can be used by the Trap  
station, Network Management functions are best performed  
NOTE  
by a station with Super-user access to the EMM-E6.  
3. Press the Return key.  
4. Using the arrow keys, highlight the Traps field and enter Y to send  
alarms from the EMM-E6 to that workstation, or N to prevent the  
EMM-E6 from sending alarms to that workstation.  
5. Press the Return key.  
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CONFIGURING THE TRAP TABLE  
6. Using the arrow keys, highlight the desired Trap IP Address field.  
7. Enter the IP address of the workstation to which you want the  
EMM-E6 to send traps. Use the XXX.XXX.XXX.XXX format with  
the value of XXX ranging from 0 to 254.  
8. Using the arrow keys, highlight the SAVE command.  
9. Press the Return key. The message “SAVED OK” appears.  
If you exit without saving, you lose all edits.  
NOTE  
10. Exit the screen by either pressing the appropriate Function key to go  
directly to the desired LM screen, or by using the arrow keys to  
highlight the desired LM screen or the RETURN command, and then  
pressing the Return key. Using the RETURN command takes you  
back to the Feature Selection Screen.  
The designated workstations, if properly configured and utilizing SNMP  
compliant remote management software, will now receive SNMP traps  
from the EMM-E6.  
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CHAPTER 9  
SNMP TOOLS SCREEN  
This section describes specific commands and features within the SNMP  
Tools screen. This screen allows you to access management information  
bases (MIBs), and varies according to your level of security access.  
The following descriptions outline the super-user management  
capabilities. From SNMP Tools you can:  
•
•
•
review specifics about object identifiers (OIDs)  
edit configurable OIDs  
view OIDs sequentially from the originally requested OID.  
9.1 ACCESSING THE SNMP TOOLS SCREEN  
To access the SNMP Tools Screen:  
1. From the Features Selection Screen, use the arrow keys to highlight the  
SNMP Tool Support option.  
2. Press the Return key. The SNMP Tools Screen, Figure 9-1, appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
SNMP TOOLS  
COMMUNITY NAME: public  
OID PREPEND: 1.3.6.1  
GET SET GETNEXT WALK RECALL-OID STEP CYCLES REPEAT  
F6  
F7  
F8  
F9  
RETURN  
F10  
Figure 9-1. SNMP Tools Screen  
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CHAPTER 9: SNMP TOOLS SCREEN  
9.2 SNMP TOOLS SCREEN FIELDS  
The following describes the SNMP Tools Screen fields and commands.  
COMMUNITY NAME  
Identifies the community name MIB access level password.  
OID PREPEND  
Specifies the number prefix common to all object identifiers (OIDs)  
found in a MIB. The prefix ‘1.3.6.1’ is the default. You can modify  
this field to suit your needs.  
GET  
Allows you to retrieve MIB objects, one at a time, using SNMP  
protocol.  
SET  
Lets you edit modifiable MIB objects, using SNMP protocol.  
GETNEXT  
Displays the next OID in the MIB tree by getting the next SNMP OID  
from a remote agent.  
WALK  
Scrolls through the MIB, leaf by leaf, from a user-specified object  
identifier. Leaves are objects, or instances of objects. After initializing  
a walk you see the following categories for each entry:  
•
•
•
•
Specified OID — identifies the number tag for that OID.  
Size — gives the number of bytes required to store the object.  
Data Type — gives the object’s variable type (e.g., int=integer).  
Data Value — displays what the object identifier represents.  
RECALL-OID  
Recalls from memory the last OID used since powering up the board  
or re-entering the SNMP Tools screen.  
STEP  
Displays the MIB, step by step, with specific OID details.  
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THE SECURITY ACCESS LEVEL  
CYCLES  
Allows you to specify the number of GET NEXT requests to walk  
through and how much time elapses between each request.  
REPEAT  
Repeats the Get command, allowing you to monitor any changes to a  
specific OID.  
9.3 THE SECURITY ACCESS LEVEL  
Each MIB component that the EMM-E6 supports (e.g., RMON, DLM,  
Repeater Rev. 4, etc.) has its own “password” for each possible level of  
access (ranging from Basic Read-Only to Super-User).  
Most MIB component community names default to “public.” However,  
some components have specific community names (e.g., depending on  
what devices reside in the EMM-E6 managed hub, Repeater Rev. 4 uses  
separate community names for each channel in use – “channelA,”  
“channelB,” and/or “channelC”).  
A complete list of Super-User community names (also called  
community strings) resides in the Cabletron proprietary  
NOTE  
chassis MIB. The MIB group chCompName provides the  
names of the MIB components. The MIB group  
chCompSUCommStr provides individual MIB component  
community names/strings.  
The component information corresponds numerically – by  
last digit. In other words, each instance (i.e., OID element) in  
the chCompName group indicates its match in the  
chCompSUCommStr group.  
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CHAPTER 9: SNMP TOOLS SCREEN  
In order to access a specific MIB’s components, you must set the  
appropriate MIB password in the COMMUNITY NAME field.  
The default super-user password (public) allows you to  
access most MIB components. To change the SNMP Tools  
NOTE  
screen COMMUNITY NAME field, you must have super-user  
access to Local Management.  
To set the SNMP Tools screen COMMUNITY NAME:  
1. Use the arrow keys to highlight the field to the right of  
COMMUNITY NAME.  
2. Enter the community name necessary for super-user access for any  
specific MIB (e.g., channelA for Repeater Rev. 4 MIB).  
3. Press the Return key. The community name changes.  
9.4 GETTING AND SETTING OIDS  
To get an OID:  
1. Highlight GET, using the arrow keys.  
2. Press the Return key. “<GET> OID (=|F9)” appears.  
3. Enter an OID either by:  
•
using the keyboard to enter the OID.  
Save yourself some keystrokes by typing the OID minus the  
OID’s prepend (i.e., given an OID prepend of 1.3.6.1, you  
TIP  
enter 2.1.1.4.0, and the LM gets the MIB II sysContact OID  
1.3.6.1.2.1.1.4.0).  
•
pressing F9 to recall an OID already entered, and using the keyboard  
to modify the recalled OID as necessary.  
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GETTING AND SETTING OIDS  
4. Press the Return key. If there is no instance of that OID, the EMM-E6  
displays “MIB_NO_INSTANCE.” Otherwise, the EMM-E6 displays  
that OID’s data type, length, and value.  
To get the next OID:  
1. Highlight GETNEXT, using the arrow keys.  
2. Press the Return key. “<GETNEXT> OID (=|F9)” appears.  
3. Enter the OID.  
4. Press the Return key. If that OID does not exist, the EMM-E6 displays  
“MIB_NO_INSTANCE”. Otherwise the EMM-E6 displays that  
OID’s data type, length, and value.  
If you have previously entered an OID, press F9 to recall that  
entry. You can use the arrow keys to modify the recalled OID,  
TIP  
or if you have not previously entered the OID, type the OID  
minus the OID’s prepend.  
To set an OID:  
1. Highlight SET, using the arrow keys.  
2. Press the Return key. “<SET> OID (=|F9)” appears.  
3. Enter an OID.  
4. Press the Return key. If that OID does not exist, the EMM-E6 displays  
“MIB_NO_INSTANCE”. Otherwise the EMM-E6 displays:  
{INteger String Null OId IP address Counter Gauge Timeticks OPaque}  
“DATA TYPE (name):”  
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CHAPTER 9: SNMP TOOLS SCREEN  
If you have previously entered an OID, press F9 to recall that  
entry. You can use the arrow keys to modify the recalled OID,  
or if you have not previously entered the OID, save yourself  
some keystrokes by typing the OID minus the OID’s prepend.  
TIP  
5. Enter the OID’s Data Type.  
When setting a String, SNMP tools requests the kind of data  
you plan to enter — HEX or ASCII.  
NOTE  
6. Press the Return key. The EMM-E6 displays “SNMP OID DATA.”  
7. Enter the Data, or value of the OID.  
8. Press the Return key. If the EMM-E6 accepts the entry, it displays  
“<SET> OPERATION CODE: XXXX <OK>”; otherwise, an error  
message appears.  
9.5 SCROLLING THROUGH MIB OIDS  
Viewing several object identifiers at one time allows you to quickly scan a  
MIB for the information that you need. The SNMP Tools screen provides  
several scroll options:  
•
•
Walk — scrolls through OIDs sequentially, from the initial OID.  
Cycle — allows you to specify how many GetNext commands to  
cycle through for one OID.  
•
Step — pages through the MIB, one OID at a time.  
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SCROLLING THROUGH MIB OIDS  
To walk through the MIB:  
1. Highlight WALK, using the arrow keys.  
2. Press the Return key. “<INITIAL> OID (=|F9)” appears.  
3. Enter the OID.  
4. Press the Return key. LM begins walking through the sublayers of the  
MIB available from the specified OID. Each OID in the list displays  
the specified OID, its size, its data type, and the data value.  
5. Press any key to stop the walk, or wait for “***MIB WALK  
COMPLETED***” to appear on the screen.  
To cycle through:  
1. Highlight CYCLES, using the arrow keys.  
2. Press the Return key. “ENTER CYCLE COUNT:” appears.  
3. Enter the number of OID cycles that you want to scroll through.  
4. Press the Return key. “ENTER CYCLE DELAY:” appears.  
5. Enter the delay that you want (in seconds) between get next requests.  
6. Press the Return key. “<INITIAL> OID (=|F9)” appears.  
7. Enter the OID.  
8. Press the Return key.  
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CHAPTER 9: SNMP TOOLS SCREEN  
To step through:  
1. Highlight GETNEXT, using the arrow keys.  
2. Press the Return key. “<GETNEXT> OID (=|F9)” appears.  
3. Enter the OID (only the suffix is necessary).  
4. Press the Return key. The initial OID details, including its size, data  
type, and data value, appear.  
5. Highlight STEP, using the arrow keys.  
6. Press the Return key to page through the MIB to the next OID.  
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CHAPTER 10  
ROUTER SETUP SCREEN  
This chapter shows the Router Setup Screen, Figure 10-1, below. Using  
this screen the user can select the protocol to be used by any Routing  
Services previously installed in the EMM-E6. The user should use the  
Routing Services Manual to make the correct selections from the Router  
Setup Screen. The EMM-E6 User’s Guide does not cover routing and all  
data on this window will be found in the Routing Services Manuals.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
SNMP TOOLS  
INTEGRATED ROUTER X.XX.XX  
ROUTER SETUP  
IP  
IPX  
DECnet  
INITIALIZE  
RETURN  
Figure 10-1. Router Setup Screen  
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CHAPTER 11  
DEVICE STATISTICS SCREEN  
This chapter describes the features of the Device Statistics screen. Using  
this screen, you can view error, collision, and traffic statistics for the  
entire network, a selected slot, or a selected port. This screen also  
provides the option of enabling and disabling ports.  
To access the Statistics screen:  
1. From the Features Selection screen, use the arrow keys to highlight the  
Device Statistics option.  
2. Press the Return key. The Device Statistics screen, Figure 11-1,  
appears.  
EMM-E6-960 LOCAL MANAGEMENT  
Cabletron EMM-E6 Revision 0.00.00  
DEVICE STATISTICS  
NETWORK: A  
SLOT: 1  
PORT: 1  
BYTES RECEIVED:  
FRAMES RECEIVED:  
FRAMES FILTERED:  
FRAMES TRANSMITTED:  
ERRORS RECEIVED:  
COLLISIONS:  
OOW COLLISIONS:  
CRC ERRORS:  
ALIGNMENT ERRORS:  
RUNT PACKETS:  
3792125  
16547  
67960  
255  
0
0
0
0
0
0
0
67960  
255  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GIANT PACKETS:  
PORTADMIN. STATUS:  
PORT SEG. STATUS:  
ENABLE  
UNSEGMENTED  
ENABLE PORT  
UPDATE -FREQ 3 Sec NETWORK  
DISABLE PORT  
SLOT  
A
1
PORT  
1
RETURN  
Figure 11-1. Device Statistics Screen  
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CHAPTER 11: DEVICE STATISTICS SCREEN  
11.1 DEVICE STATISTICS  
This section describes Device Statistics screen data fields.  
BYTES RECEIVED  
Displays the number of bytes received.  
FRAMES RECEIVED  
Displays the number of frames received.  
FRAMES FILTERED  
Displays the total number of frames filtered.  
FRAMES TRANSMITTED  
Displays the total number of frames transmitted.  
ERRORS RECEIVED  
Displays the total number of errors received.  
COLLISIONS  
Displays the number of collisions received.  
OOW COLLISIONS  
Displays the number of Out Of Window collisions. OOW collisions  
are usually caused by: The network being so long that the round trip  
propagation delay is greater than 51.2 µs (the collision domain is too  
large); a station somewhere on the network violating Carrier Sense  
and transmitting at will; or a cable somewhere on the network failing  
during the transmission of a packet.  
CRC ERRORS  
Displays the number of packets with bad Cyclic Redundancy Checks  
(CRC) that have been received from the network. The CRC is a 4 byte  
field in the data packet that ensures that the transmitted data that is  
received is the same as the data that was originally sent.  
ALIGNMENT ERRORS  
Displays the number of errors due to misaligned packets. Misaligned  
packets contain a non-integral number of bytes (i.e., some bytes  
contain fewer than 8 bits).  
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DEVICE STATISTICS SCREEN COMMANDS  
RUNT PACKETS  
Displays the number of runt packets received from the network. A  
runt packet is less than the minimum Ethernet frame size of 64 bytes,  
not including preamble.  
GIANT PACKETS  
Displays the number of giant packets receivedfrom the network. A  
giant packet is greater than the maximum Ethernet frame size of 1518  
bytes, not including preamble.  
PORT ADMIN. STATUS  
Displays the administrative status of the port selected. The two  
possible status messages are Enable or Disable.  
PORT SEG. STATUS  
Displays the segmentation status of the port selected. The two  
possible status messages are Segmented or Unsegmented. The  
EMM-E6 automatically partitions problem ports or interfaces (those  
having 32 consecutive collisions, and re-connects non-problem  
segments to the network.  
11.2 DEVICE STATISTICS SCREEN COMMANDS  
The Device Statistics screen provides several commands that allow you to  
access and manipulate various boards and ports. This section first gives a  
brief description of each command, and then explains how to use them.  
ENABLE PORT  
This command lets you enable the selected port.  
DISABLE PORT  
This command lets you Disable the selected port.  
UPDATE-FREQ  
This command lets you select the time interval between Network/  
Slot/Port counter updates. You can choose update intervals in  
increments of 3 seconds, with the maximum interval being 99  
seconds.  
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CHAPTER 11: DEVICE STATISTICS SCREEN  
NETWORK  
This command lets you select the network you want to monitor. The  
choices range from A to F, depending on the configuration of your  
network and the options available from this configuration. For  
example, if you do not have a Media Interface Module running on the  
A Channel, the EMM-E6 automatically disallows Channel A as a  
network selection.  
SLOT  
This command lets you select the MMAC hub slot that you want to  
monitor. The choices vary depending on the MMAC chassis you use.  
The far right slot is always slot number one (1).  
PORT  
This command lets you select and view port statistics for ports 1  
through 26 of the device residing in the selected Slot.  
11.2.1 Selecting an Update Frequency  
The EMM-E6 updates the Device Statistics screen every three seconds by  
default. The EMM-E6 allows you to adjust this frequency in intervals of  
three seconds (maximum frequency is 99 seconds).  
To adjust the UPDATE-FREQ:  
1. Use the arrow keys to highlight the UPDATE-FREQ command.  
2. Press the Shift and + keys together, or just the - key until the desired  
time/frequency appears (this number increments/decrements in 3  
second intervals; minimum = 3 seconds; maximum = 99 seconds).  
3. Press the Return key to set and save the changes to the  
UPDATE-FREQ field.  
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DEVICE STATISTICS SCREEN COMMANDS  
11.2.2 Selecting a Network/Slot/Port  
When the Device Statistics screen first appears, statistics are displayed for  
Network 1, Slot 1, and Port 1. To view statistics for another Network,  
Slot, and Port, use the NETWORK X, SLOT X, or PORT X commands at  
the bottom of the screen.  
To select a Network, Slot, or Port:  
1. Using the arrow keys, highlight the NETWORK X, SLOT X, or  
PORT X command.  
2. Press the Shift and + keys together, or just the - key until the desired  
network, slot, or port number appears.  
3. Press the Return key. Statistics associated with the selected network,  
slot, or port appear.  
11.2.3 Enabling Ports  
The ENABLE PORT command lets you enable the port selected in the  
PORT command. You must first use the PORT command to select the  
desired port.  
To set the PORT ENABLE command:  
1. Use the arrow keys to highlight the ENABLE PORT command at the  
bottom of the screen.  
2. Press the Return key. The PORT ADMIN. STATUS field displays  
“ENABLE”.  
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CHAPTER 11: DEVICE STATISTICS SCREEN  
11.2.4 Disabling Ports  
The DISABLE PORT command lets you disable the port selected in the  
PORT command. You must first use the PORT command to select the  
desired port.  
To set the PORT DISABLE command:  
1. Use the arrow keys to highlight the DISABLE PORT command at the  
bottom of the screen.  
2. Press the Return key. The PORT ADMIN. STATUS field displays  
“DISABLED”.  
11.3 EXITING THE DEVICE STATISTICS SCREEN  
To exit the Device Statistics screen:  
1. Use the arrow keys to highlight the RETURN command at the bottom  
of the screen.  
2. Press the Return key. The Feature Selection screen appears.  
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CHAPTER 12  
COMMAND LINE INTERFACE SCREEN  
The Command Line Interface (CLI) Screen, Figure 12-1, will function in  
future releases of the EMM-E6.  
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CLI INFORMATION  
THIS SCREEN RESERVED FOR THE  
CABLETRON COMMAND LINE INTERFACE  
COMMUNITY NAMES  
F7  
IP TABLE  
F8  
TRAP TABLE SNMP TOOLS  
F9 F10  
RETURN  
Figure 12-1. EMM-E6 CLI Information Screen  
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CHAPTER 13  
MIB NAVIGATOR  
This chapter describes the procedures required to access the MIB  
Navigator residing on the EMM-E6. The MIB Navigator Command Set is  
described and examples of each command are provided.  
13.1 MANAGING DEVICE MIBs  
The MIB Navigator allows access to a command set from which you can  
configure and manage your device. The MIB Navigator enables you to  
manage objects in the device MIBs (Management Information Bases).  
MIBs are databases of objects used for managing the device and  
determining your EMME’s configuration. The commands within the MIB  
Navigator allow you to view and modify a device’s objects.  
The MIB Navigator views the MIB tree hierarchy as a directory (Figure  
13-1). Each layer is numerically encoded, so that every branch group and  
leaf object in the MIB is identified by a corresponding number, known as  
an Object Identifier (OID). This allows the MIB Navigator to navigate  
through the MIB and access the manageable leaf objects.  
Object 1.1.1  
Object 1.1.2  
Group 1.1  
Object 1.2.1  
Root 1  
Group 1.2  
Group 1.3  
Object 1.2.2  
Object 1.3.1  
Object 1.3.2  
Figure 13-1. Hierarchical MIB Tree Structure  
Often an ASCII name is assigned to a leaf object’s OID, making it more  
readable. To identify the value for the object “ip Forwarding” you would  
use the OID (/1/3/6/1/2/1/4/1), or its ASCII name (/iso/org/dod/internet/  
mgmt/mib-2/ip/ipForwarding).  
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CHAPTER 13: MIB NAVIGATOR  
13.2 ACCESSING THE MIB NAVIGATOR  
The MIB Navigator function resides on your Cabletron device (EMM-E6,  
ETWMIM, ESXMIM, etc.). Access the MIB Navigator in-band, through a  
device (i.e., workstation) connected to the same network or internetwork,  
using a Telnet connection.  
To access the MIB Navigator, perform the following actions from a PC or  
workstation:  
1. Telnet to a device by typing telnet followed by pressing the Return  
key.  
The telnet > prompt will appear.  
2. At the telnet > prompt enter open and the IP address of the device  
followed by pressing the Return key, i.e.,  
telnet> open 123.231.213.132  
3. The following messages will appear:  
.Trying 123.231.213.132  
Connected to 123.231.213.132  
Password:  
4. Enter your password at the Password: prompt and press the Return  
key. For security reasons, the password does not display when typed.  
The password that you use is specific to the MIB that you are  
accessing.  
NOTE  
5. The MIB Navigator prompt, MIBNav ->, appears and you have access  
to the MIB Navigator commands.  
13-2  
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MIB NAVIGATOR COMMAND SET OVERVIEW  
13.3 MIB NAVIGATOR COMMAND SET OVERVIEW  
There are three categories of commands in the command set.  
•
Navigation Commands - Allows the user to access and manage the  
MIB for the device running the MIB Navigator. Some of commands  
also provide user community-string information. The commands are  
as follows:  
-
-
-
-
branch  
get  
pwd  
tree  
- cd  
- ls  
- set  
- whoami  
- ctron  
- mib2  
- show  
- dir  
- next  
- su  
•
•
Built-In Commands - Allows the user to access and manage  
network devices connected to the device running the MIB  
Navigator. The commands are as follows:  
-
-
-
arp  
- defroute - netstat  
- ping  
snmpbranch - snmpget - snmpset - snmptree  
traceroute  
Special Commands - Allows the user to exit from the MIB  
Navigator. The commands are as follows:  
-
done  
- quit  
- exit  
13.3.1 Conventions For MIB Navigator Commands  
The following conventions are used for denoting commands:  
•
•
Information keyed by the user is shown in this helvetica font.  
Command arguments are indicated by two types of brackets:  
-
-
required arguments are enclosed by [].  
optional arguments are enclosed by <>.  
MIB Navigator command conventions are as follows:  
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CHAPTER 13: MIB NAVIGATOR  
•
•
To abort the output or interrupt a process the escape character is ^C  
(where ^ equals the Control key).  
A slash (/) proceeding an OID issues that command from the root  
directory regardless of where you are in the MIB. If no slash  
precedes the OID the command issues from your current MIB  
location.  
•
Dot notation (1.1.1.1) is equivalent to slash notation (1/1/1/1). Use  
slash notation with the navigational commands, and the dot notation  
with the built-in commands that are using SNMP to access and  
manage network devices.  
13.3.2 Navigation Commands  
The following provides a brief description, the proper format, and an  
example of each Navigation command.  
The branch command displays all of the leaves in the MIB  
tree below a specified path. The information displayed  
includes the path name, the object ASCII name, the type of  
object (i.e., integer, counter, time tick, etc.), and the current  
value.  
branch  
Format:branch [PATH]  
Example MIBNav> branch /1/3/6/1/2/17  
#/1/3/6/1/2/1/7/1 udpInDatagrams COUNTER 38216  
#/1/3/6/1/2/1/7/2 udpNoPorts  
#/1/3/6/1/2/1/7/3 udplnErrors  
COUNTER  
COUNTER  
0
0
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MIB NAVIGATOR COMMAND SET OVERVIEW  
Navigation Commands (cont’d)  
Use this command to change directories within a MIB  
subtree. The path specified must be valid.  
cd  
This command has two special subtree options:  
.. - Moves you to one subtree above the current one.  
/
- Moves you to the root.  
Format: cd [PATH]  
Example  
MIBNav> cd iso/org/dod/internet/mgmt  
The ctron command enables you to change directories  
directly to the Cabletron MIB (1.3.6.1.4.1.52) without keying  
in the entire path.  
ctron  
Format: ctron  
Example  
MIBNav> ctron  
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CHAPTER 13: MIB NAVIGATOR  
Navigation Commands (cont’d)  
Each of these commands displays the contents of a  
specified sub-tree (the current directory displays if you do  
not specify a sub-tree).  
dir,  
ls  
Options can be used separately or combined. When no  
option is used the ASCII name of the leaf object displays.  
The three options available with these commands are:  
-l Displays all instances of the object’s OID value (/1/3/  
6/) and ASCII leaf object name (internet).  
-p Displays all entries from the current directory including  
the object’s path name.  
-d Displays only directory entries in the tree.  
Format:  
dir (ls)  
dir -l  
dir -lpd  
Example  
Example  
MIBNav> dir  
iso  
MIBNav> dir -l  
/1  
iso  
The get command provides you with the value of a specific  
managed object. The command is valid only for leaf entries  
in the current MIB tree, or for managed objects in the MIB.  
get  
Format:  
get <OBJECTID>  
Example  
MIBNav> get /1/3/6/1/2/1/1/1  
# Cabletron EMM-E6 Revision X.XX.XX  
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MIB NAVIGATOR COMMAND SET OVERVIEW  
Navigation Commands (cont’d)  
The help command provides a list of available MIB Navigator  
commands. The command also provides help for individual  
MIB Navigator commands.  
help  
Format:  
help (general help)  
help <COMMAND> (specific help)  
Example  
MIBNav> help su  
Command:  
Format:  
su  
su <Community Name>  
Allows user to change his/her community  
name, in order to allow different access to  
the MIB.  
The mib2 command enables you to change directories  
directly to MIB II (1.3.6.1.2.1) without keying in the entire  
path.  
mib2  
Format:  
mib2  
Example  
MIBNav> mib2  
The next command enables you to determine the next leaf in  
a specified path within the managed device’s MIB. This  
command operates much like the SNMP GETNEXT  
operator.  
next  
Format:  
next [PATH]  
Example  
MIBNav> next /1/3/6/1/2/1  
# /1/3/6/1/2/1/1/1 sysDescr String CtronRev.X.XX.XX  
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CHAPTER 13: MIB NAVIGATOR  
Navigation Commands (cont’d)  
The pwd command displays the full path name for the  
directory in which you are currently working.  
pwd  
Format:  
pwd  
Example  
MIBNav> pwd  
# /iso/org/dod/internet/mgmt/mib-2  
The set command enables you to set the value of a  
managed object. This command is valid only for leaf entries  
in the current MIB tree, or for managed objects in the MIB.  
set  
If a leaf does not exist for the given path, you will be asked  
what value to assign it. The following lists possible value  
types:  
(i)nteger - number  
(c)ounter - number  
(g)auge - number  
(t)ime ticks - number  
o(p)aque - “value” (with quotation marks)  
(s)tring - “value” (with quotation marks)  
(o)id - number/number.number  
(a)ddress - IP address/dotted decimal  
(m)ac - physical address/hex string  
(n)ull - no type  
Format:  
set <OBJECTID> <VALUE>  
Example  
Example  
MIBNav> set /1/3/6/1/2/1/1/5 “1st Floor”  
MIBNav> set /1/3/6/14/1/52/1/6/4/7 122.1.1.1  
Type: (i)nteger (a)ddress (c)ounter (g)auge (o)id:  
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MIB NAVIGATOR COMMAND SET OVERVIEW  
Navigation Commands (cont’d)  
The su command enables you to change your community  
name to allow for different access to the MIB. The  
community name that you enter allows you either Basic  
Read, Read Only, Read/Write, or Super-User access to that  
device’s MIBs, depending on the level of security access  
assigned the password through the Local Management  
Community Table. Refer to Chapter 6 on how to establish a  
community name password.  
su  
Format:  
su [COMMUNITYNAME]  
Example  
MIBNav> su public  
The tree command provides a display of the entire MIB for  
the device. Leaves and associated values are displayed in  
columns.  
tree  
Format:  
tree  
Example  
MIBNav> tree  
# /1/3/6/1/2/1/1/1 sysDescr  
# /1/3/6/1/2/1/1/2 sysObjectId OBJECT ID  
# /1/3/6/1/2/1/1/3 sysUpTime TIME TICKS 8098654  
# /1/3/6/1/2/1/1/4 sysContact STRING AlZwieback/MIS  
# /1/3/6/1/2/1/1/5 sysName STRING  
STRING  
EMRev X.X.X.X  
1.3.6.1.4.1.52  
TrngEMME2  
1st Floor Closet  
1
# /1/3/6/1/2/1/1/6 sysLocation STRING  
# /1/3/6/1/2/1/1/7 sysServices INTEGER  
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CHAPTER 13: MIB NAVIGATOR  
Navigation Commands (cont’d)  
The whoami command displays your community string and  
whoami  
access privileges to the MIB. When using the whoami  
command one of these four access levels will display: Basic  
Read, Read Only, Read/Write, and Super User.  
Format:  
whoami  
Example  
MIBNav> whoami  
# Community Name  
# Access Level  
:
:
super  
SuperUser  
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MIB NAVIGATOR COMMAND SET OVERVIEW  
13.3.3 Built-In Commands  
The following provides a brief description, the proper format, and an  
example of each Built-In command.  
The arp command provides access to the ARP (Address  
Resolution Protocol) cache, enabling you to view cache  
data, delete entries, or add a static route. Superuser access  
is required to delete an entry or add a static route.  
arp  
Each arp cache entry lists: the network interface that the  
device is connected to, the device’s network address or IP  
address, the device’s physical address or MAC address, and  
the media type of connection to the device. The device’s  
media connection occurs in one of the following ways:  
1 - Other  
2 - Invalid entry (cannot ping device, timed out, etc.)  
3 - Dynamic route entry  
4 - Static route entry (not subject to change).  
Format  
arp -a (to view cache data)  
arp -d <INTERFACENUM>  
<IPADDRESS> (deletes an IP address  
entry)  
arp -s <INTERFACENUM>  
<IPADDRESS> <MACADDR> (adds a  
static entry)  
Example MIBNav> arp -a  
# Interface Network Address Physical Address Media Type  
# (SonicInt) 122.144.40.111 00.00.0e.12.3c.04 3(dynamic)  
# (SonicInt) 122.144.48.109 00.00.0e.f3.3d.14 3(dynamic)  
# (SonicInt) 122.144.52.68  
# (SonicInt) 122.144.21.43  
00.00.0e.12.3c.04 3(dynamic)  
00.00.0e.03.1d.3c 3(dynamic)  
Example MIBNav> arp -d 1 122.144.52.68  
Example MIBNav> arp -s 1 22.44.2.3 00:00:0e:03:1d:3c  
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CHAPTER 13: MIB NAVIGATOR  
Built-In Commands (cont’d)  
The netstat provides a display of general network statistics  
netstat  
for the managed device. The netstat command must be  
used with one of the following two display options:  
-i Displays status and capability information for each  
interface.  
-r Displays routing information for each interface.  
Format  
netstat -i  
netstat -r  
Example  
MIBNav> netstat -i  
#Intrfc Description AdmnState OperState MTU Speed  
#1  
#2  
#3  
#4  
enet-csmacd up  
enet-csmacd up  
enet-csmacd up  
enet-csmacd up  
up  
up  
up  
up  
1514 10000000  
1514 10000000  
1514 10000000  
1514 10000000  
Example MIBNav> netstat -r  
# Destination Next-Hop  
Interface  
# 122.144.40.0 DirectConnection  
4
The ping command generates an outbound ping request to  
check the status (alive/not alive) of a device at a specified IP  
address.  
ping  
Format:  
ping <IPADDRESS>  
Example MIBNav> ping 122.144.40.10  
# 122.144.40.10 is alive  
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MIB NAVIGATOR COMMAND SET OVERVIEW  
Built-In Commands (cont’d)  
The snmpbranch command enables you to query another  
SNMP device. The command provides a display of objects  
that match the specified OBJECT-ID. If no match is made,  
no object will display.  
snmp-  
branch  
Format:  
snmpbranch <IPADDRESS>  
<COMMUNITY STRING> <OBJECT-ID>  
Example MIBNav> snmpbranch 2.4.8.1 public 1.3.6.2.1.1  
# /1/3/6/1/2/1/1/1 sysDescr STRING EMRev X.X.X.X  
# /1/3/6/1/2/1/1/2 sysObjectID OBJECT ID 1.3.6.1.4.1.52  
# /1/3/6/1/2/1/1/3 sysUpTime TIME TICKS 8098654  
# /1/3/6/1/2/1/1/4 sysContact STRING  
# /1/3/6/1/2/1/1/5 sysName STRING  
# /1/3/6/1/2/1/1/6 sysLocation STRING  
# /1/3/6/1/2/1/1/7 sysServices INTEGER  
SueJason/MIS  
Trng EMME2  
1st floor closet  
1
The snmpget command enables you to query another  
SNMP device to obtain a value for a specified object. This  
command requires the appropriate community string and  
object id.  
snmpget  
Format:  
snmpget <IPADDRESS>  
<COMMUNITY-NAME> <OBJECT-ID>  
Example MIBNav>snmpget 22.44.61.22 public 1.3.6.1.2.1.1.1.0  
# Cableton EMME Revision X.XX.XX  
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CHAPTER 13: MIB NAVIGATOR  
Built-In Commands (cont’d)  
The snmpset command enables you to set the value of an  
snmpset  
object in other SNMP devices. This command requires the  
appropriate community string and OID.  
When defining a new leaf, the set command prompts you for  
a value type. Possible value types are as follows:  
(i)nteger - number  
(c)ounter - number  
(g)auge - number  
(t)ime ticks - number  
o(p)aque - “value” (value with quotation marks)  
(s)tring - “value” (value with quotation marks)  
(o)id - number/number.number  
(a)ddress - IP address/dotted decimal  
(m)ac - physical address/hex string  
(n)ull - no type  
Format:  
snmpset <IPADDRESS> <COMMUNITY-  
NAME> <OBJECT-ID> <VALUE>  
Example  
MIBNav> snmpset 122.44.1.2 public  
1.3.6.1.2.1.1.4.0 “Cyrus/MIS”  
The snmptree command provides a display of all objects in  
the device and their corresponding values.  
snmptree  
Format:  
snmptree <IPADDRESS>  
<COMMUNITY-NAME>  
Example MIBNav> snmptree 122.144.89.10 public  
# /1/3/6/1/2/1/1/1 sysDescr  
STRING  
EM Rev X.X.X.X  
# /1/3/6/1/2/1/1/2 sysObjectID OBJECT ID 1.3.6.1.4.1.52  
# /1/3/6/1/2/1/1/3 sysUpTime TIME TICKS 8098654  
# /1/3/6/1/2/1/1/4 sysContact STRING  
# /1/3/6/1/2/1/1/5 sysName STRING  
# /1/3/6/1/2/1/1/6 sysLocation STRING  
# /1/3/6/1/2/1/1/7 sysServices INTEGER  
SlyStallone/MIS  
Trng EMME2  
1st floor closet  
1
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MIB NAVIGATOR COMMAND SET OVERVIEW  
Built-In Commands (cont’d)  
The traceroute command generates a TRACEROUTE  
request to a specified IP address and provides a display of  
all next-hop routers in the path to the device. If the device is  
not reached, the command displays all next-hop routers to  
the point of failure.  
traceroute  
Format:  
traceroute <IPADDRESS>  
Example  
MIBNav> traceroute 122.144.11.52  
# next-hop[1] 122.144.61.45  
# next-hop[2] 122.144.8.113  
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CHAPTER 13: MIB NAVIGATOR  
13.3.4 Special Commands  
The following provides a brief description, the proper format, and an  
example applicable to each Special command.  
These commands enable you to exit from the MIB Navigator  
and return to the operating system.  
done,  
quit,  
exit  
Format:  
done  
Example  
MIBNav> done  
Connection closed.  
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USING LANVIEW  
CHAPTER 14  
TROUBLESHOOTING  
This chapter includes information for troubleshooting network and EMM-  
E6 operational problems. The following sections describe the EMM-E6’s  
LANVIEW LEDs, provide a troubleshooting checklist, and explain how  
and when to reset the EMM-E6.  
14.1 USING LANVIEW  
The EMM-E6 uses the Cabletron Systems built-in visual diagnostic and  
status monitoring system called LANVIEW. With LANVIEW, you can  
quickly scan the EMM-E6 LEDs to observe network status or diagnose  
network problems.  
EMM-E6  
SN  
RESET  
CPU  
D
C
B
A
STBY  
RCV  
XMT  
CLN  
Figure 14-1. LANVIEW LEDs  
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CHAPTER 14: TROUBLESHOOTING  
Table 14-1. LANVIEW LEDs  
Error Condition/  
Recommended Action  
LED  
Color  
Description  
CPU  
Multicolor Flashing Green  
indicates that the  
If OFF, or Red, the board has a  
problem.  
Green  
Red  
board is  
operating  
properly.  
Press the reset switch on the  
EMM-E6 front panel to re-  
initialize the board. If the board  
does not re-initialize, it has  
probably failed. Call Cabletron  
Technical Support.  
STBY  
A,B,C,D  
(Standby)  
Yellow  
Indicates  
Network Management has  
placed the EMM-E6 in a  
Standby condition; a data loop  
condition exists.  
packets will not  
be forwarded as  
the Spanning  
Tree Algorithm  
has put the  
corresponding  
Bridge Port into  
a standby mode  
due to detecting  
a data loop  
Check with your Network  
Administrator to find out if the  
EMM-E6 was placed in  
Standby on purpose.  
If a Data loop does exist,  
reconfigure the network to  
remove the data loop.  
condition.  
RCV  
A,B,C,D  
(Receive)  
Yellow  
LED flashes to  
indicate that a  
segment is  
receiving a  
frame.  
If none of the receive LEDs is  
flashing, the EMM-E6 is not  
receiving frames on any of the  
segments.  
Check that each module is  
firmly installed in the MMAC.  
Ensure that all connected ports  
are enabled.  
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USING LANVIEW  
Table 14-1. LANVIEW LEDs (Continued)  
Error Condition/  
Recommended Action  
LED  
Color  
Description  
XMT  
A,B,C,D  
(Transmit)  
Green  
LED flashes to  
indicate that a  
segment is  
transmitting a  
frame.  
If none of the transmit LEDs is  
flashing, the EMM-E6 is not  
transmitting frames on any of  
the segments.  
Contact Cabletron Technical  
Support for assistance.  
If not connected  
to the LAN, the  
LED flashes  
every two  
seconds to  
indicate it is  
transmitting  
BPDU frames.  
CLN  
(Collision)  
Red  
Collision  
Excessive flashing, or a solid  
light, indicates an inordinate  
number of collisions.  
detected on a  
segment. When  
the LAN is  
operating  
Ensure that the SQE test is  
disabled for any transceiver  
connected to the EMM-E6’s  
external channels (D, E, or F).  
Check cabling for data loops or  
defective cables.  
properly,  
occasional  
flashing is  
normal.  
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CHAPTER 14: TROUBLESHOOTING  
14.2 TROUBLESHOOTING CHECKLIST  
If your EMM-E6 is not operating properly, the following checklist  
describes some of the problems that may occur with the EMM-E6  
installed in an MMAC, possible causes for the problem, and suggestions  
for resolving the problem.  
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TROUBLESHOOTING CHECKLIST  
Table 14-2. Troubleshooting Checklist  
Recommended  
Action  
Problem  
Possible Causes  
No LEDs on.  
Loss of Power to the  
MMAC.  
Check the proper installation of the  
MMAC power supply module and  
its access to a live outlet.  
EMM-E6 not properly  
installed.  
Check that the MMAC has  
adequate power. Some  
configurations, especially those  
including FDDI modules, require  
that more than one power supply be  
installed in the MMAC.  
Check to see that the power supply  
LEDs are green.  
Reset EMM-E6 by removing it from  
chassis and reinserting according  
to directions in Chapter 3. Ensure  
that all fasteners are tightened.  
No Local  
Terminal setup is not  
correct.  
Refer to Chapter 4 for proper setup  
procedures.  
Management  
Password  
screen.  
Improper console  
cable/UPS cable  
pinouts.  
Refer to Appendix A for proper  
console/ UPS port pinouts.  
Cannot  
contact the  
EMM-E6  
Improper Community  
Names Table.  
Refer to Chapter 6 for Community  
Names Table setup and Chapter 7  
for IP address assignment  
procedures.  
from in-band  
EMM-E6 does not  
management. have an IP address.  
Check link to device.  
No link to device.  
Check Static Database.  
Packets are being  
bridged by a  
permanent entry.  
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CHAPTER 14: TROUBLESHOOTING  
Table 14-2. Troubleshooting Checklist (Continued)  
Recommended  
Action  
Problem  
Possible Causes  
A port on a  
MIM  
The port is either off or  
segmented.  
Enable the port via local or remote  
management.  
managed by  
the EMM-E6  
cannot  
Port cable is  
defective.  
Try connecting the port with a  
different cable.  
access the  
network,  
while other  
ports on the  
same MIM  
are able to  
access.  
User  
Switch 7 has been  
toggled and user-  
entered parameters  
have been reset to  
factory default.  
See Chapter 3 for information on  
the NVRAM switch setting.  
parameters  
(IP address,  
Device and  
Module  
name, etc.)  
are lost  
when device  
is powered  
down.  
If NVRAM is defective, call  
Cabletron Technical Support.  
NVRAM may be  
defective.  
No power to  
an external  
transceiver  
connected to  
an EPIM-A.  
EPIM is defective.  
Replace EPIM.  
AUI cable is defective.  
Replace AUI cable.  
High number  
of collisions  
on EPIM port.  
External transceiver  
has SQE enabled.  
Disable SQE.  
Port(s) go  
into standby  
for no  
apparent  
reason.  
Configurations where  
devices connected  
across EMM-E6  
channels can cause  
the EMM-E6 to detect  
a looped condition.  
Discuss these configurations with  
Cabletron Technical Support  
before implementing them into  
your network.  
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USING THE RESET SWITCH  
14.3 USING THE RESET SWITCH  
The EMM-E6 incorporates a recessed reset switch, located above the  
LEDs (see Figure 14-1). This reset switch initializes the EMM-E6  
processor. This switch does NOT initialize Non-Volatile Random Access  
Memory (NVRAM), the non-volatile random access memory where the  
EMM-E6 stores network management parameters.  
To use the reset switch, use a pen or pencil to press the switch in. When  
this is done, the EMM-E6 initializes itself.  
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CHAPTER 15  
IMAGE FILE DOWNLOAD  
This chapter provides instructions for downloading an image file to the  
EMM-E6 using three different methods; altering hardware switch settings  
to force the module to accept new firmware, through UNIX operating  
System commands, and by setting specific MIB OID strings. To set OID  
strings, you can use the SNMP Tools screen described in Chapter 9 of this  
User’s Guide or any MIB walking tool. Refer to specific MIB walking  
tool documentation for instructions on how to set MIB OID strings.  
You can also download an image file using various remote  
management packages such as Cabletron’s Remote  
NOTE  
LANVIEW/Windows, SPECTRUM, SPECTRUM Element  
Manager, or the appropriate SPECTRUM Portable  
Management Application. Refer to specific package  
documentation for image file download procedures.  
The EMM-E6 supports the following Download applications:  
•
Forced Download - Forcing a download of firmware images is  
accomplished using Switch 6 of the EMM-E6 and a pre-configured  
reverse address resolution protocol server holding the firmware  
image.  
•
•
Standard Local Download - the EMM-E6 automatically disables  
management while you download the new firmware image.You can  
not perform a Standard Download from a BRIM port.  
Remote Runtime Download - the EMM-E6 continues to operate  
without interruption while you download the new firmware image.  
The EMM-E6 stores the new image in Flash memory. It continues to  
operate with the old firmware image executing in processor memory  
until you reset the EMM-E6.You can perform a Runtime Download  
from any network port, including the BRIM.  
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CHAPTER 15: IMAGE FILE DOWNLOAD  
15.1 GETTING STARTED  
Cabletron ships backup copies of image files for all of its intelligent  
devices. The first file, suffixed with .hex (after it has been decompressed  
from a .zip) is for Standard Local Downloading (any port, except the  
BRIM). The second file, suffixed with .fls (after it has been decompressed  
from a .zip) is for Remote Runtime Downloading through any network  
port, including the BRIM.  
Before you can download the image to a device, you must:  
•
load the image file onto your network rarp server  
For information on setting up a workstation as a rarp server,  
NOTE  
refer to your specific workstation documentation. This  
documentation includes limited information and guidelines  
for setting up a UNIX workstation to act as a reverse address  
resolution protocol (rarp) server.  
•
decompress the image file.  
For your convenience, Cabletron includes the PKUNZIP  
NOTE  
utility for easy decompression of the “zipped” file. If you are  
using a UNIX workstation as a rarp server, and you do not  
have a decompression utility that recognizes the PKZIP  
format, you can obtain a copy of a UNIX decompression  
utility or the image file from the Cabletron Systems FTP  
server. Contact Cabletron Technical Support for details.  
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FORCED DOWNLOAD WITH UNIX  
15.2 FORCED DOWNLOAD WITH UNIX  
Downloading an EMM-E6 image file with a UNIX workstation requires  
setting up a management station, and forcing the download. To force a  
download, you can use mode switch 6 on the EMM-E6 or set specific  
MIB OIDs.  
You can also download with other UNIX or DOS remote  
management packages. Refer to specific package  
NOTE  
documentation for image file download procedures.  
Due to variations between UNIX systems and individual configurations,  
this section provides only GUIDELINES for configuring a UNIX  
workstation to perform an image file download. The instructions include  
command examples, where appropriate. Bold lettering in examples  
indicates operator entry.  
If unsure how to properly configure your UNIX workstation  
using these guidelines, contact your Systems Administrator.  
NOTE  
Before you start:  
•
•
Editing ethers or hosts files requires Root/Superuser access.  
Downloading an image file requires setting up your UNIX  
workstation as a reverse address resolution protocol (rarp) server.  
To set up a UNIX workstation:  
1. Edit the /etc/ethers file by adding the EMM-E6 MAC address,  
followed by a unique name (e.g., 00:00:1d:32:0c:1b EMME6).  
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CHAPTER 15: IMAGE FILE DOWNLOAD  
2. Edit the /etc/hosts file by adding the EMM-E6 MAC address and  
follow it with the same unique name you used in step one above.  
(e.g., 00:00:1d:32:0c:1b EMME6).  
3. If you already have a /tftpboot directory, confirm the rarp setup of your  
workstation as follows:  
Request a process status and grep for rarpd  
(e.g., unix% ps -aux | grep rarpd).  
The following information represents a typical output:  
user 161 7.7 1.2 32 184 p3  
S
S
12:00 grep rarpd  
11:05 rarpd -a  
root  
root  
87 0.0 0.9 48 136  
88 0.0 0.0 24  
?
?
0
IW 11:05 rarpd -a  
The term rarpd -a, located at the end of the root string, indicates rarp is  
active. If rarp is NOT running, only the grep process appears.  
4. If you do NOT have a /tftpboot directory, then you must create one  
(e.g., unix% mkdir tftpboot), and start the rarp daemon  
(e.g., unix% rarpd -a).  
5. Ensure that the /tftpboot directory is not owned  
(e.g., unix% chown nobody tftpboot).  
6. Store the hex image file in the /tftpboot directory as emme6.hex.  
This step requires decompression of the zipped image file. If  
you do not have a UNIX unzip utility, access to a PC with  
NOTE  
pkunzip, or a way to FTP the decompressed image to your  
UNIX workstation, contact Cabletron Technical Support.  
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FORCED DOWNLOAD WITH UNIX  
7. Edit the /etc/inetd.conf file by removing anything prior to the tftpboot  
daemon (e.g., the # sign) that comments-out the line.  
8. Kill the inetd process (e.g., unix% kill -HUP ‘process ID number’),  
and then restart the process (e.g., unix% inetd), to enable the revised  
inetd.conf file.  
You must request a process status and grep for inetd to obtain  
the process ID number (see step 3 above).  
NOTE  
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CHAPTER 15: IMAGE FILE DOWNLOAD  
To force a download using the EMM-E6 download switch:  
1. Remove the safety bars from the MMAC chassis.  
2. Unscrew the knurled knobs at the top and bottom of the EMM-E6 front  
panel.  
3. Slide the MIM out of the chassis until you can easily access the  
EMM-E6 switch panel located at the bottom of the board.  
4. Change the state of EMM-E6 mode switch 6. For example, if the  
switch is in the “OFF” position, move it to the “ON” position and leave  
it there. This change in position activates the download process after  
you reinstall the board.  
The EMM-E6 boot PROM must recognize the switch position  
change to initiate a download sequence. This means you must  
NOTE  
power-up the EMM-E6 at least one time for it to load initial  
switch positions into memory.  
5. Follow the installation procedures from Chapter 3 to re-install the  
EMM-E6 properly.  
Image file download takes several minutes. While downloading, the  
EMM-E6 CPU LED flashes and the XMT/RCV pair receiving the image  
flickers rapidly.  
The EMM-E6 Boot-up Diagnostics indicate a file transfer from a server is  
in progress. After the image file download is complete, verify that Local  
Management displays the correct image file (FW) version number.  
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STANDARD LOCAL DOWNLOAD  
15.3 STANDARD LOCAL DOWNLOAD  
Table 15-1 provides a step by step procedure for downloading the  
firmware image file. This section provides specific MIB OIDs, their  
names, and the required setting for proper image file download. Refer to  
your specific MIB walking tool documentation for instructions on how to  
set MIB OID strings.  
The Download OIDs for Cabletron products reside in Cabletron  
enterprise MIBs (group 52). The specific OIDs necessary to perform an  
image file download reside in the common download group under  
ctDL (Cabletron Download). The full OID string to reach this group is:  
1.3.6.1.4.1.52.4.1.5.8.1  
When performing the steps in Table 15-1, keep the following in mind:  
•
•
You must follow the steps in order.  
Enter the IP address of the tftp server in standard dotted decimal  
notation (e.g., 132.177.118.24).  
•
Enter the FULL path to the image file in the ctDLTFTPRequest OID,  
including the name of the image file (e.g., c:\tftpboot\EMME6.hex).  
Table 15-1. Standard Download Procedure  
Data  
Type  
SNMP  
OID Data  
Step  
OID Name  
OID Number  
(1).  
(2).  
(3).  
ctDLForceOnBoot  
1.3.6.1.4.1.52.4.1.5.8.1.1.0  
1.3.6.1.4.1.52.4.1.5.8.1.2.0  
1.3.6.1.4.1.52.4.1.5.8.1.4.0  
integer  
integer  
1
1
ctDLCommitRAMToFlash  
ctDLTFTPRequestHost  
IP  
address  
Enter the IP  
address of  
the tftp  
server.  
(4).  
(5).  
ctDLTFTPRequest  
1.3.6.1.4.1.52.4.1.5.8.1.5.0  
1.3.6.1.4.1.52.4.1.5.8.1.3.0  
string  
(ASCII)  
Enter the  
path to the  
image file.  
ctDLInitiateColdBoot  
integer  
1
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CHAPTER 15: IMAGE FILE DOWNLOAD  
15.4 REMOTE RUNTIME DOWNLOAD  
If the Runtime Download is interrupted, the Firmware Image  
NOTE  
in Flash memory will be erased. The EMM-E6 will continue  
to operate until it is either Reset or Powered OFF and ON.  
After either of these events, the EMM-E6 can download a  
Firmware Image from a BootP server ONLY! The process of  
configuring a BootP Server is discussed at length in  
Cabletron’s “Installing and Using Remote LANVIEW for  
Windows”. Although Runtime Download is a powerful  
network operations & firmware management feature, careful  
consideration should be given to both the timing (best when  
network usage is lowest) and network stability (especially  
downloads over a WAN link) at the time of the planned  
download.  
Table 15-2 provides a step by step procedure for downloading the  
firmware image file. This section provides specific MIB OIDs, their  
names, and the required setting for proper image file download. Refer to  
your specific MIB walking tool documentation for instructions on how to  
set MIB OID strings.  
The Download OIDs for Cabletron products reside in Cabletron  
enterprise MIBs (group 52). The specific OIDs necessary to perform an  
image file download reside in the common download group under  
ctDL (Cabletron Download). The full OID string to reach this group is:  
1.3.6.1.4.1.52.4.1.5.8.1  
When performing the steps in Table 15-2 keep the following in mind:  
•
•
You must follow the steps in order.  
Enter the IP address of the tftp server in standard dotted decimal  
notation (e.g., 132.177.118.24).  
•
Enter the FULL path to the image file in the ctDLTFTPRequest OID,  
including the name of the image file (e.g., c:\tftpboot\EMME6.fls).  
15-8  
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REMOTE RUNTIME DOWNLOAD  
Table 15-2. Runtime Download Procedure  
Data  
Type  
Step  
(1).  
OID Name  
ctDLTFTPRequestHost  
ctDLTFTPRequest  
OID Number  
SNMP OID Data  
1.3.6.1.4.1.52.4.1.5.8.1.18.0 IP  
address  
Enter the IP address  
of the tftp server.  
(2).  
1.3.6.1.4.1.52.4.1.5.8.1.19.0 string  
Enter the path to  
the image file.  
(ASCII)  
(3).  
ctDLOnLineDownload  
1.3.6.1.4.1.52.4.1.5.8.1.16.0 integer  
1 = Default setting  
(normal operation).  
2 =  
forceDownLoad.  
The new image  
downloads to Flash  
memory. The EMM-  
E6 does not use the  
new image until you  
press the Reset  
button.  
3 =  
forceDownLoad-  
Reset. The new  
image downloads to  
Flash memory. The  
EMM-E6  
automatically resets  
upon completion of  
the download.  
(4)  
ctDLOperStatus  
1.3.6.4.1.52.4.1.5.8.1.17.0  
Integer  
2 = Indicates that a  
TFTP download  
request has been  
received but has  
not yet been  
(This OID monitors the  
progress of the Runtime  
Download.)  
activated.  
3 = Indicates  
normal operation.  
The download  
started and finished  
normally and no  
reset was specified  
or a download has  
not been started.  
4 = Indicates that a  
download is in  
progress.  
5 = Indicates that a  
download was  
started but has  
terminated due to an  
error.  
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CHAPTER 15: IMAGE FILE DOWNLOAD  
Table 15-2. Runtime Download Procedure (Continued)  
Data  
Type  
Step  
OID Name  
OID Number  
SNMP OID Data  
NOTE: If you selected forceDownLoadReset at Step 3, then DO NOT  
CONTINUE, you have completed all necessary settings.  
NOTE: If you selected forceDownLoad at Step 3, then you can reset the  
EMM-E6 at a later time.You can reset the EMM-E6 remotely using the  
ctDLInitiateColdBoot OID described at Step 5 or manually using the Reset  
Button or Cycle Power.  
(5).  
ctDLInitiateColdBoot  
1.3.6.1.4.1.52.4.1.5.8.1.3.0  
integer  
1
15-10  
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APPENDIX A  
EMM-E6 SPECIFICATIONS  
This appendix provides the operating specifications for the Cabletron  
Systems EMM-E6. Cabletron Systems reserves the right to change these  
specifications at any time without notice.  
A.1 BRIDGING FUNCTIONALITY  
FLASH Memory:  
Shared Sonic Memory:  
Internal Processor:  
Read Only Memory:  
Non-Volatile RAM:  
Ethernet Controller:  
CPU Memory:  
2 MB (expandable to 14 MB)  
4 MB (expandable to 12 MB)  
Intel 80960  
128K  
128K  
4 DP83932 Controllers  
8 MB (expandable to 12MB)  
Packet Filter Rate  
(max. viewed per second):  
30,000 packets  
Packet Forward Rate  
(max. forwarded per second):  
22,000 packets  
91 µs min.  
Forwarding Latency:  
Ageing Time:  
5 minutes (default)  
8,191 max.  
Filtering Database:  
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APPENDIX A: EMM-E6 SPECIFICATIONS  
A.2 REPEATER FUNCTIONALITY  
Delay Times  
(port x in to port x out)  
Start of Packet:  
1,450 ns max.  
1,550 ns max.  
Collision to JAM:  
Preamble  
Input:  
Minimum of 40 bits to a max. of 64 bits  
required.  
Output:  
64bits min. (last 2 bits = 1, 1).  
JAM Output:  
If a collision occurs on one of the segments, a  
pattern of 1,0 is sent to the other segments.  
Minimum Packet Repeated: 96 bits including preamble. (Packet  
fragments are extended using the JAM [1,0]  
data pattern.)  
FAULT Protection:  
Each segment will disconnect itself from the  
other segments if 32 consecutive collisions  
occur, or the collision detector of a segment is  
on for longer than approximately 2.4 ms. This  
FAULT protection will reset automatically  
after one packet is transmitted onto the  
FAULT protected segment without causing a  
collision.  
A-2  
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A.3 COM 1 PORT  
Type: Standard RJ45 port  
Pin 1 Transmit Data (XMT)  
From COM 1 port  
To COM 1 port  
2
3
4
5
6
7
8
Data Set Ready (DSR)  
Not used  
Receive Data (RCV)  
Signal Ground (GND)  
Data Terminal Ready (DTR) From COM 1 port  
Not used  
Not used  
To COM 1 port  
A.4 COM 2 PORT  
Type: Standard RJ45 port  
Pin 1 Transmit Data (XMT)  
From COM 2 port  
To COM 2 port  
2
3
4
5
6
7
8
Data Set Ready (DSR)  
Not used  
Receive Data (RCV)  
Signal Ground (GND)  
Data Terminal Ready (DTR) From COM 2 port  
Not used  
Not used  
To COM 2 port  
A.5 ENVIRONMENTAL REQUIREMENTS  
Operating Temperature:  
Non-operating Temperature:  
Operating Humidity:  
+5° to +40°C (+41° to +104°F)  
-30° to +90°C (-22° to +194°F)  
5 to 95% (non-condensing)  
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APPENDIX A: EMM-E6 SPECIFICATIONS  
A.6 SAFETY  
This unit meets the safety requirements of UL 1950 (without D3  
deviations), CSA C22.2 No. 950, and EN 60950; the EMI requirements of  
FCC Part 15 Class A, EN 55022 Class A, and VCCI Class I; and the EMC  
requirements of EN 50082-1, including IEC 801-2 (ESD) levels 1 through  
4, IEC 801-3 (Radiated Susceptibility) levels 1 through 4, and IEC 801-4  
(EFT/B) levels 1 through 4.  
It is the responsibility of the person who sells the system of  
which the EMM-E6 will be a part to ensure that the total  
WARNING  
system meets allowed limits of conducted and radiated  
emissions.  
A.7 PHYSICAL PROPERTIES  
Dimensions:  
34.04D x 29.21H x 7.64W cm.  
(13.4D x 11.5H x 3.0W in.)  
Weight  
Unit:  
Shipping:  
1.25 kg (2.75 lbs.)  
1.74 kg (3.83 lbs.)  
A-4  
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A.8 EPIM-T (10BASE-T TWISTED PAIR PORT)  
Internal Transceiver:  
Cabletron Systems TPT  
10BASE-T  
Twisted Pair Transceiver  
Type:  
8 Pin RJ45 Jack (Figure A-1).  
Figure A-1. EPIM-T (with RJ45 Port)  
A slide switch on the EPIM-T determines the cross-over status of the  
cable pairs. The switch residing on the X side indicates the pairs  
internally cross over. If the switch resides on the = side, the pairs do  
not internally cross over. (See Figure A-2.)  
Position X  
(crossed over)  
1. RX+  
2. RX-  
3. TX+  
4. NC  
5. NC  
6. TX-  
7. NC  
8. NC  
Position =  
(not crossed over)  
1. TX+  
2. TX-  
3. RX+  
4. NC  
5. NC  
6. RX-  
7. NC  
8. NC  
Figure A-2. Cross-over Switch on the EPIM-T  
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APPENDIX A: EMM-E6 SPECIFICATIONS  
A.9 EPIM-F1/F2 (MULTIMODE FIBER OPTIC PORT)  
Internal Transceiver:  
Cabletron Systems FOT-F  
Fiber Optic Transceiver  
Type:  
EPIM-F1:  
EPIM-F2:  
SMA fiber optic ports (Figure A-3)  
ST fiber optic ports (Figure A-3)  
Figure A-3. EPIM-F1 and EPIM-F2  
The transmitter power and receive sensitivity levels, below,  
represent Peak Power Levels after optical overshoot. You  
must use a Peak Power Meter to correctly compare the above  
values to those you measure on any particular port. If you  
measure Power Levels with an Average Power Meter, you  
must subtract 3 dBm from the measurement to correctly  
compare measured values to the values below (e.g., -29.5  
dBm peak = -32.5 dBm average).  
NOTE  
Table A-1, EPIM-F1/-F2 Statistics  
Receive Sensitivity:  
Max Receive Power:  
Transmitter Power Into -  
50/125 µm fiber:  
-29.5 dBm  
-8.2 dBm  
-13.0 dBm  
62.5/125 µm fiber:  
100/140 µm fiber:  
Bit Error Rate:  
-10.0 dBm  
-7.0 dBm  
Better than 10-10  
A-6  
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A.10 EPIM-F3 (SINGLE MODE FIBER OPTIC PORT)  
Internal Transceiver:  
Cabletron Systems FOT-F3  
Fiber Optic Transceiver  
Type:  
ST fiber optic ports (Figure A-4)  
Figure A-4. EPIM-F3  
Transmitter power is inversely proportional to temperature  
rise. Use the Output Power Coefficient to calculate increased  
or decreased power output for your operating environment.  
For example, typical power output at 25C equals -16.4 dBm.  
For a 4C temperature increase, multiply the typical  
coefficient (-0.15 dBm) by four, and add the result to the  
typical output power (4 x -0.15 dBm + -16.4 dBm = -17.0  
dBm).  
NOTE  
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APPENDIX A: EMM-E6 SPECIFICATIONS  
Table A-2. EPIM-F3 Statistics  
Typical Minimum  
1300 nm 1270 nm  
Parameter  
Maximum  
Transmitter Peak  
Wave Length:  
1330 nm  
Spectral Width:  
Rise Time:  
60 nm  
—
100 nm  
5.0 ns  
5.0 ns  
50.7%  
3.0 ns  
2.7 ns  
2.2 ns  
49.6%  
Fall Time:  
2.5 ns  
Duty Cycle:  
TX Power:  
50.1%  
-15.1 dBm  
14.4 dBm  
-29.5 dBm  
TX Budget:  
RX Sensitivity:  
MAX Receive  
Power:  
-6.99 dBm  
Bit Error Rate:  
Better than 10-10  
The above transmitter power levels and receive sensitivity  
levels represent Peak Power Levels after optical overshoot.  
You must use a Peak Power Meter to correctly compare the  
above values to those you measure on any particular port. If  
you measure Power Levels with an Average Power Meter,  
you must subtract 3 dBm from the measurement to correctly  
compare those measured values to the values listed above  
(e.g., -29.5 dBm peak = -32.5 dBm average).  
NOTE  
A-8  
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A.11 EPIM-C (BNC PORT)  
Internal Transceiver:  
Cabletron Systems TMS-3  
Transceiver  
Type:  
BNC receptacle, with gold  
center contact, for use with BNC  
type T-connectors and RG-58  
thin-net cable (Figure A-5).  
Internal Termination Switch  
= On (internally terminated)  
= Off (need external termination)  
Figure A-5. EPIM-C (with BNC Port)  
Termination:  
Using the switch to the side of  
the port, you can internally  
terminate the port on the module  
via a built-in 50Ω terminator.  
This eliminates the need to  
connect the port to a T-connector  
and terminator.  
Grounding:  
For safety, connect only one end  
of a thin-net segment to earth  
ground. Do not connect the BNC  
port of an EPIM-C to earth  
ground.  
Connecting a thin coaxial cable segment to earth ground at  
more than one point can produce dangerous ground currents.  
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APPENDIX A: EMM-E6 SPECIFICATIONS  
A.12 EPIM-A AND EPIM-X (AUI PORT)  
Interface Connector:  
DB-15 Port (female connector  
for EPIM-A, male connector for  
EPIM-X) (Figure A-6).  
Type:  
15 position D type receptacle  
Figure A-6. EPIM-A and EPIM-X (AUI Port)  
Table A-3. DB-15 Pinouts  
Pin  
1
2
3
4
5
6
7
8
Logic Ref.  
Collision +  
Transmit +  
Logic Ref.  
Receive +  
Pin  
9
Collision -  
10 Transmit -  
11 Logic Ref.  
12 Receive -  
13 Power (+12 Vdc)  
14 Logic Ref.  
15 No Connection  
Power Return  
No Connection  
Logic Ref.  
Connector Shell:  
Protective Ground  
A-10  
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APPENDIX B  
EMM-E6 OIDs  
This Appendix contains a selected number of OID strings that are among  
the most frequently needed. The OIDs are implemented by using either  
the SNMP Tools procedures detailed in Chapter 9 or the MIB Navigator  
procedures located in Chapter 13. Note that the OIDs can be accessed  
using LANVIEW, SPECTRUM, SPMA, or the SNMP element  
management packages of other vendors.  
B.1 SPANNING TREE PROTOCOL  
The following OID is used to select the desired Spanning Tree Protocol.  
ctBridgeStpProtocolSpecification  
Description: This object allows the network manager to select  
which Spanning Tree Protocol will be operational on the bridge.  
The value ‘decLb100’ (2) indicates the DEC LANBridge 100  
Spanning Tree Protocol. The value ‘ieee8021d’ (3) indicates the  
IEEE 802.1d Spanning Tree Protocol. The value ‘none’ (1)  
indicates no Spanning Tree Protocol is operational.  
Object Identifier: 1.3.6.1.4.1.52.4.1.2.3.2.1  
Data Type:  
Values:  
Integer  
1
None  
2
3
decLb100  
ieee8021  
Access Policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
B.2 CONFIGURING ARP REQUEST PACKETS  
The EMM-E6’s SNMP Tools Screen allows you to generate an Address  
Resolution Protocol (ARP) Request packet utilizing specific framing  
through local management. An ARP Request is used to send an SNMP  
Trap to a destination node that has not yet made or established contact  
with the EMM-E6. This situation may occur when the destination node in  
question has been moved from one port or channel interface of the  
EMM-E6 to another location and has not yet transmitted information  
which would notify the EMM-E6 of its network location. The generation  
of ARP Request packets in such a situation would allow the EMM-E6 to  
locate the reconfigured station without waiting for that station to transmit.  
rptrScrAddrMgmtHashType  
Description: Forces the EMM-E6 to utilize a specific framing  
type for any ARP Request packet. The values entered determine  
the framing type utilized for the ARP packet. Please note that any  
changes to the framing type to be utilized for ARP requests will  
take effect after the next soft reset of the EMM-E6.  
Object Identifier: 1.3.6.1.4.1.52.4.2.2.2.3.1.2.2.2.1.1.1.8.1  
Data Type:  
Values:  
Integer  
2
Ethernet Framing  
3
802.3=802.2 w/SNAP Header  
Access Policy:  
read-write  
B-2  
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PORT GROUP SECURITY  
B.3 PORT GROUP SECURITY  
The next seven OIDs are used for port group security features.  
rptrSrcAddrMgmtPortLock  
Description: Setting this object to lock activates the network port  
security lock. Setting a value of portMisMatch (3) is invalid. A  
read of PortMisMatch means that the lock status between the port  
group, port and repeater levels do not agree.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.1.5.3.2  
Data Type:  
Values:  
Integer  
1
unlock  
2
lock  
3
portMisMatch  
Access Policy:  
read-write  
rptrPortGrpSrcAddrLock  
Description: Allows the setting of the lock status for this port  
group. Unlock (1), unlocks the source address lock for this group.  
Lock (2) locks the source address for this group. Setting a value  
of portMisMatch (3) for this value is invalid. A read of  
PortMisMatch (3) means that the lock status for the ports within  
the port group does not match the lock status for the port group.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.2.6.1.2  
Data Type:  
Values:  
Integer  
1
unlock  
2
lock  
3
portMisMatch  
Access policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
rptrPortSecurityLockStatus  
Description: Defines the lock status for this particular port entry.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.9.1.1.3  
Data Type:  
Values:  
Integer  
1
2
unlock  
lock  
Access Policy:  
read-write  
rptrPortSecurityLockAddAddress  
Description: Setting a value to this object adds a new entry to the  
rptrPortSecurityListTable. When read, this object displays an  
Octet String of size 6 with each octet containing a 0. This object  
provides an easy method to add or delete conceptual rows in the  
rptrPortSecurityListTable. The returned value has little or no  
actual meaning.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.9.1.1.4  
Data Type:  
Access Policy:  
Octet String (size 6)  
read-write  
rptrPortSecurityLockDelAddress  
Description: Setting a value to this object deletes a corresponding  
entry in the rptrPortSecurityListTable. When read, this object  
returns the last deleted source address. An Octet String of size 0 is  
returned if no objects were deleted since last system reset.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.9.1.1.5  
Data Type:  
Access Policy:  
Octet String  
read-write  
B-4  
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PORT GROUP SECURITY  
rptrPortSecurityDisableOnViolation  
Description: Designates whether port is disabled if source address  
is violated. A source address violation occurs when an address is  
detected which is not in the source address list for this port. If this  
port is disabled for this port address violation it can be enabled by  
setting rptrPortMgmtAdminState. Default state is enabled (2).  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.9.1.1.6  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
rptrPortSecurityFullSecEnabled  
Description: A port that is set to full security and is locked will  
scramble all packets, which are not contained in the expected  
source address list, including broadcasts and multicasts. A port  
that is set to partial security will allow broadcast and multicasts to  
repeat unscrambled. Default state disabled (1).  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.9.1.1.7  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
B.4 ENABLING & DISABLING SNMP TRAPS  
The EMM-E6 supports the collection and reporting of SNMP Traps of  
several types and at several levels. SNMP Trap sending may be enabled or  
disabled for the following trap types: segmentation, link, and source  
addressing. The traps may be enabled on the network level, module level,  
or port level.  
B.4.1 Enabling Network Level SNMP Traps  
The next three OIDs control traps enable and disable at the network level  
or channel level.  
rptrHwTrapsSetLink  
Description: Enables and disables link traps for this network (i.e.,  
Channel A, B, or C).  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.1.6.1.1  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
rptrHwTrapsSetSeg  
Description: Enables and disables segmentation traps for this  
network (i.e., Channel A, B, or C).  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.1.6.1.2  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
B-6  
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ENABLING & DISABLING SNMP TRAPS  
rptrSaTrapSetScraddr  
Description: Enables and disables source address traps for this  
network (i.e., Channel A, B, or C).  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.1.6.2.1  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
B.4.2 Enabling Module Level SNMP Traps  
The next three OIDs are for traps enable and disable at the board level.  
The <b#> value is the number of the module in the MMAC chassis to be  
examined. This number will be based on the location of the module in the  
chassis. For detailed descriptions of the location numbering scheme in  
your MMAC chassis, please refer to your MMAC User’s Guide.  
rptrPortGrpHwTrapSetLink  
Description: Enables and disables link traps for the specified port  
group at the board level.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.2.5.1.1.1.2.<b#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
rptrPortGrpHwTrapSetSeg  
Description: Enables and disables segmentation traps for the  
specified port group at the board level.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.2.5.1.1.1.3.<b#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
rptrPortGrpSaTrapSetSrcaddr  
Description: Enables and disables segmentation traps for the  
specified port group at the board level.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.2.5.1.1.2.<b#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
B.4.3 Enabling Port Level SNMP Traps  
The next three OIDs are for traps enable and disable at the port level. The  
<b#> value is the number of the module in the MMAC chassis to be  
examined. This number will be based on the location of the module in the  
chassis. For detailed descriptions of the location numbering scheme in  
your MMAC chassis, please refer to your MMAC User’s Guide.  
Likewise, the <p#> value is the assigned number of the individual port on  
that module which SNMP Traps will be enabled or disabled for. Port  
numbers may be determined by examining the faceplate of the module,  
where they are clearly printed.  
B-8  
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ENABLING & DISABLING SNMP TRAPS  
rptrPortHwTrapSetLink  
Description: Enables and disables link traps for this port.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.8.1.1.1.3.<b#>.<p#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
rptrPortHwTrapSetSeg  
Description: Enables and disables segmentation traps for this  
port.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.8.1.1.1.4.<b#>.<p#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
rptrPortGrpSaTrapSetSrcaddr  
Description: Enables and disables source address traps for the  
specified port group.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.8.2.1.1.3.<b#>.<p#>  
Data Type:  
Values:  
Integer  
1
2
disable  
enable  
Access Policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
B.5 ACTIVATING RMON GROUPS  
The initial configuration of the EMM-E6 at installation does not provide  
the activation of the RMON Default and Host Groups. These management  
groups may be activated or deactivated through local management using  
OID Sets. As the specific OID used to control each RMON bundle is  
dependent upon the presence or absence of BRIMs and their type, an  
SNMP Get is necessary to determine the OID instances of the RMON  
bundles before they may be enabled or disabled.  
chCompName  
Description: Returns OID values for the location of the RMON  
bundle OIDs in the device being examined. These values may be  
used in conjunction with the chCompAdminStatus OID (below)  
to activate and deactivate the individual RMON bundles.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.2.4.1.5  
Data Type:  
Integer  
Access Policy:  
read-write  
chCompAdminStatus  
Description: Enables and disables the RMON Default Group for  
an EMM-E6.  
Object Identifier: [Result of above SNMP Get]  
Data Type:  
Values:  
Integer  
7
3
disable  
enable  
Access Policy:  
read-write  
B-10  
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BRIDGING  
B.6 BRIDGING  
The following OID is used to enable and disable the interface for the  
bridging function.  
dot1dstpPortEnable  
Description: The enabled/disabled status of the port.  
Object Identifier: 1.3.6.1.2.1.17.2.15.1.4  
Data Type:  
Values:  
Integer  
1
2
enable  
disable  
Access Policy:  
read-write  
B.7 TRUNK PORT SECURITY  
The following OID is required if security is not desired on a trunk port.  
The user must force the port to be a trunk port before locking the port via  
the module or channel. Failing to do this will cause the port to become  
locked out when the third address is seen on the trunk port.  
rptrPortSrcAddrForceTrunk  
Description: When this object is set to Force, it places the port  
into a Trunk topology state whether or not the network traffic  
warrants such a state. When this object is set to NoForce, it allows  
the port to assume the topological state it would naturally assume  
based on the network activity across it. When read, this object  
reports the current setting.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.3.5.1.4  
Data Type:  
Values:  
Integer  
1
2
NoForce  
Force  
Access Policy:  
read-write  
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APPENDIX B: COMMONLY-USED OIDs  
B.8 CHANNEL SELECTION  
The following two OIDs are needed to select channel assignments (A, B,  
or C) for all boards or individual ports. These OIDs are needed for  
products supporting multichannel connectivity.  
fnbconnect  
Description: Denotes the connection status of the CSMA/CD  
board to the inter-RIC bus.  
Object Identifier: 1.3.6.1.4.1.52.1.6.1.2.2.1.1.2.slot  
Data Type:  
Values:  
Integer  
1
2
4
Channel B  
Channel C  
Channel A  
Access Policy:  
read-write  
fnbPortConnectPortAssignment  
Description: Provides the capability to change or query the  
specific interface that the port is assigned.  
Object Identifier: 1.3.6.1.4.1.52.1.6.1.2.3.1.1.3.slot.port  
Data Type:  
Values:  
Integer  
1
2
3
Channel A  
Channel B  
Channel C  
Access Policy:  
read-write  
B-12  
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OID HASHING ON SOURCE ADDRESES  
B.9 OID HASHING ON SOURCE ADDRESES  
The following OID allows the enabling and disabling of DEC hashing,  
which may be necessary or desired in DECnet and mixed IEEE 802.3/  
DECnet environments.  
rptrSrcAddrMgmtHashType  
Description: This enables and disables DECnet hashing on source  
addresses which is useful in DECnet environments.  
Object Identifier: 1.3.6.1.4.1.52.4.1.1.1.4.1.5.3.4.0  
Data Type:  
Values:  
Integer  
1
2
NoDECnetHashing  
DECnetHashing  
Access Policy:  
read-write  
B.10 REMOTE DOWNLOADING  
For detailed step-by-step instructions on the use of OIDs for forcing a  
remote download of firmware instruction code to the EMM-E6, please  
refer to Image File Download, Chapter 15 of the main text.  
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GLOSSARY  
This glossary provides brief descriptions of some of the recurrent terms in the  
main text, as well as related terms used in discussions of the relevant networking  
discussions. These descriptions are not intended to be comprehensive discussions  
of the subject matter. For further clarification of these terms, you may wish to  
refer to the treatments of these terms in the main text.  
Words in the glossary description text listed in boldface type indicate other  
entries in the glossary which may be referred to for further clarification.  
10BASE-2  
IEEE standard which governs the operation of devices  
connecting to Ethernet thin coaxial cable.  
10BASE-FL  
IEEE standard which governs the operation of devices  
connecting to Ethernet fiber optic cable. Supersedes  
previous FOIRL standard.  
10BASE-T  
Alarm  
IEEE standard which governs the operation of devices  
connecting to Ethernet Unshielded Twisted Pair (UTP)  
cable.  
A notification, generated by the operation of SNMP,  
which is sent to a management station to indicate a  
problem with the network or warn of an error condition.  
Application  
Architecture  
1: A software operation performed by a workstation or  
other network node. 2: A layer of the OSI Model.  
A collective rule set for the operation of a network.  
Architectures describe the means by which nodes transmit  
and receive information in the network. See also:  
Ethernet, Topology.  
ATM  
Asynchronous Transfer Mode. A networking architecture  
that is based on the use of connections between  
communicating devices that are set up, used, and then  
eliminated.  
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Attenuation to BRIM  
Attenuation Loss of signal power (measured in decibels) due to  
transmission through a cable. Attenuation is dependent on  
the type, manufacture and installation quality of cabling,  
and is expressed in units of loss per length, most often  
dB/m.  
AUI  
Attachment Unit Interface. A cabling type used in Ethernet  
networks, designed to connect network stations and  
devices to transceivers.  
Backbone  
Backplane  
A portion of a network which provides the interconnection  
of a number of separate, smaller networks.  
The portion of a modular chassis to which all modules  
are connected. Typically the backplane provide power and  
management functions to each module, and is used to  
provide networking connections, via buses, to all modules  
in the modular chassis.  
Bit  
Binary Digit. A bit is the smallest unit of information,  
consisting of a single binary number. A bit is represented  
by a numerical value of 1 or 0.  
BOOTP  
Bootstrap Protocol. Checks MIB variables of a SNMP  
manageable device to determine to determine wether it  
should start up using its existing firmware or boot up from  
a network server specifically configured for the purpose.  
Branch Group  
Bridge  
A collection of MIBs related by common function. These  
MIBs are collected into families called branches. See also  
Leaf Object, MIB Tree.  
Bridges are network devices which connect two or more  
separate network segments while allowing traffic to be  
passed between the separate networks when necessary.  
Bridges read in packets and decide to either retransmit  
them or block them based on the destination to which the  
packets are addressed.  
BRIM  
GL-2  
Bridge/Router Interface Module. BRIMs are added to  
BRIM-capable Cabletron equipment to provide  
connections to external networks through an integrated  
bridge or router.  
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Broadcast to Connectivity  
Broadcast  
Buses  
A type of network transmission; a broadcast transmission  
is one which is sent to every station on the network,  
regardless of location, identification, or address.  
Physical portions of the backplane of a modular chassis  
which pass information between modules.  
Card  
See Module.  
Channel  
A portion of a backplane bus which is specifically  
partitioned off for the transmission of one type of network  
data.  
Chassis  
Client  
See Modular Chassis.  
A workstation or node which obtains services from a  
server device located on the network.  
Client-Server  
A computing model which is based on the use of dedicated  
devices (servers) for the performance of specific  
computational or networking tasks. These servers are  
accessed by several clients, workstations which cannot  
perform those functions to the same extent or with the  
same efficiency as the servers.  
Coaxial  
An Ethernet media type which consists of a core of  
electrically conductive material surrounded by several  
layers of insulation and shielding.  
Community  
Name  
An identification which allows a specific level of access to  
the network device. Similar to a password, a Community  
Name acts to restrict access to control capabilities and  
network statistics.  
Concentrator  
Congestion  
A network device which allows multiple network ports in  
one location to share one physical interface to the network.  
An estimation or measure of the utilization of a network,  
typically expressed as a percentage of theoretical  
maximum utilization of the network.  
Connectivity  
The physical connection of cabling or other media to  
network devices. The coupling of media to the network.  
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Console to Decryption  
Console  
See Terminal.  
Cross-Over  
A length of multi-stranded cable in which the transmit  
wire(s) of one end is/are crossed over within the cable to  
connect to the receive wire(s) of the other end. Cross-  
Overs are used to connect devices to like devices, ensuring  
that transmit and receive connections are properly made.  
Crosstalk  
CSMA/CD  
A corruption of the electrical signal transmitted through a  
Shielded or Unshielded twisted pair cable. Crosstalk refers  
to signals on one strand or set of strands affecting signals  
on another strand or set of strands.  
Carrier Sense Multiple Access with Collision Detection.  
CSMA/CD is the basis for the operation of Ethernet  
networks. CSMA/CD is the method by which stations  
monitor the network, determine when to transmit data, and  
what to do if they sense a collision or other error during  
that transmission.  
Data  
Information, typically in the form of a series of bits, which  
is intended to be stored, altered, displayed, transmitted, or  
processed.  
Data Loop  
A condition caused by the creation of duplicate paths  
which network transmissions could follow. Data loops are  
created by the use of redundant connections between  
network segments or devices. Ethernet networks cannot  
effectively function with data loops present. To allow the  
creation of fault-tolerant networks, data loops are  
automatically detected and eliminated by the Spanning  
Tree algorithm.  
DB15  
A 15-pin connector used to terminate transceiver cables  
in accordance with the AUI specification.  
DB9  
A 9-pin connector, typically used in Token Ring networks  
and for serial communications between computers.  
Decryption  
The translation of data from an encrypted form into a  
form both recognizable and utilizable by a workstation,  
node, or network device.  
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Dedicated to Fault-Tolerance  
Assigned to one purpose or function.  
Dedicated  
Default  
Gateway  
the IP address of the network or host to which all packets  
addressed to unknown network or host are sent  
Device  
(network)  
Any discrete electronic item connected to a network which  
either transmits and receives information through it,  
facilitates that transmission and reception, or monitors the  
operation of the network directly.  
DLM  
DNI  
Distributed LAN Monitor. DLM is a feature of some  
SNMP management devices which allows that device to  
locally monitor other devices under its control and report  
to a central network management station any noted errors.  
This frees the network management station from directly  
monitoring every SNMP device.  
Desktop Network Interface. DNI cards are devices which  
are added to workstations to provide them with a  
connection to a network (NIC).  
EEPROM  
Electronic Erasable Programmable Read-Only Memory.  
Encryption  
A security process which encodes raw data into a form that  
cannot be utilized or read without decryption.  
EPIM  
Ethernet Port Interface Module. EPIMs are added to  
specifically-designed slots in Cabletron Ethernet products  
to provide connections to external media. EPIMs allow a  
great flexibility in the media used to connect to networks.  
Ethernet  
A networking architecture which allows any station on  
the network to transmit at any time, provided it has  
checked the network for existing traffic, waited for the  
network to be free, and checked to ensure the transmission  
did not suffer a collision with another transmission.See  
also CSMA/CD.  
Fault-  
Tolerance  
The ability of a design (device or network) to operate at  
full or reduced capacity after suffering a failure of some  
essential component or connection. See also redundant.  
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FDDI to Host  
FDDI  
Fiber Distributed Data Interface. A high-speed networking  
architecture. FDDI requires that stations only transmit  
data when they have been given permission by the  
operation of the network, and dictates that stations will  
receive information at pre-determined intervals. See also  
Token.  
Fiber optics  
Network media made of thin filaments of glass  
surrounded by a plastic cladding. Fiber optics transmit and  
receive information in the form of pulses of light. See  
multimode and single mode.  
File  
A collection of related data.  
Fileserver  
A network server device which stores and maintains data  
files for the use and modification of users on the network.  
Firmware  
The software instructions which allow a network device to  
function. See also Image file.  
Flash EEPROM  
FNB  
See EEPROM.  
Flexible Network Bus. A Cabletron backplane design  
which enables an FNB-configured chassis to support  
multiple network architectures simultaneously.  
Frame  
A group of bits that form a discrete block of information.  
Frames contain network control information. The size and  
composition of a frame is determined by the network  
protocol being used.  
Gateway  
A router.  
See SQE.  
Heartbeat  
Hexadecimal  
A base 16 numerical system. Digits in hexadecimal run  
from 0 to 9 and continue from A to F, where F is  
equivalent to the decimal number 16.  
Host  
GL-6  
A device which acts as the source or destination of data on  
the network.  
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Hot Swap to IP  
Hot Swap  
Hot Swap capability indicates that a product is capable of  
being removed from an operating modular chassis and  
reinserted or replaced without requiring that the chassis  
and all associated modules be powered down.  
Hub  
See Modular Chassis.  
IANA  
Internet Assigned Numbers Authority. An agency which  
assigns and distributes IP addresses.  
IEEE  
Institute of Electrical and Electronic Engineers. A  
standards-making body.  
IETF  
Internet Engineering Task Force. A standards-making  
body.  
Image File  
Impedance  
In-Band  
Software instruction code which is downloaded to an  
intelligent network device. See also Firmware.  
A measure of the opposition of electrical current or signal  
flow in a length of cable.  
Performed through the operating network architecture.  
Refers most commonly to management functions. See also  
Out-of-Band.  
Interface  
Internet  
A connection to a network. Unlike a port, an interface is  
not necessarily an available physical connector accessible  
through the front panel of a device. Interfaces may be used  
as backplane connections, or may be found only in the  
internal operation of a module (All ports are interfaces, but  
not all interfaces are ports).  
A world-wide network which provides access through a  
vast chain of private and public LANs.  
Inter-  
operability  
The capacity to function in conjunction with other devices.  
Used primarily to indicate the ability of different vendors’  
networking products to work together cohesively.  
IP  
Internet Protocol.  
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IP Address to Mbps  
IP Address  
Internet Protocol address. The IP address is associated, by  
the network manager or network designer, to a specific  
interface. The availability of IP addresses is controlled by  
the IANA.  
ISO  
International Organization for Standardization. The ISO  
has developed a standard model on which network  
operation is based, called the OSI Model.  
Jitter  
Degradation of network signals due to a loss of  
synchronization of the electrical signals. Jitter is often a  
result of passing a signal through too many repeaters.  
LAN  
Local Area Network.  
LANVIEW  
A system which relates diagnostic, troubleshooting, and  
operational information pertaining to network devices  
through the use of prominently displayed LEDs.  
LDRAM  
Local Dynamic Random Access Memory  
Leaf Object  
An end unit in a MIB tree. Leaf objects are accessed  
through a series of branch groups. Leaf objects are  
always individual MIBs.  
LED  
Light Emitting Diode. A simple electronic light, used in  
networking equipment to provide diagnostic indicators.  
Also used as a light source for some fiber optic  
communications equipment.  
Load  
An indication of network utilization.  
MAC Address  
Media Access Control address. The MAC address is  
associated, usually at manufacture, with a specific  
interface.  
Mbps  
Megabits Per Second. Mbps indicates the number of  
groups of 1000 bits of data that are being transmitted  
through an operating network. Mbps can be roughly  
assessed as a measure of the operational “speed” of the  
network.  
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Media to Nanometer  
Media  
MIB  
Physical cabling or other method of interconnection  
through which network signals are transmitted and  
received.  
Management Information Base. A database of data related  
to a specific management or manageable network device,  
which may be viewed or modified through SNMP  
commands.  
MIB Tree  
The MIB Tree is the collection of all MIBs that can be  
used to monitor or control a network device. MIB Trees  
are made up of several branch groups which lead to leaf  
objects, or MIBs.  
Micron (µ)  
A micrometer, one millionth of a meter.  
MIM  
Media Interface Module. See also: Module.  
Vital to the operation of a network, company, or agency.  
Mission-  
Critical  
Modular  
Chassis  
A device which provides power, cooling, interconnection,  
and monitoring functions to a series of flexible and  
centralized modules for the purposes of creating a  
network or networks.  
Module  
A discrete device which is placed in a modular chassis to  
provide functionality which may include, but is not limited  
to; bridging, routing, connectivity, and repeating. Modules  
are easily installed and removed. Also, any device  
designed to be placed in another device in order to operate.  
See also: BRIM, EPIM.  
Multichannel  
A Cabletron Ethernet design which provides three separate  
network channels (of Ethernet or Token Ring architecture)  
through the backplane of a chassis, allowing for the  
creation of multiple networks in a single chassis.  
Multimode  
Nanometer  
A type of fiber optics in which light travels in multiple  
modes, or wavelengths. Signals in Multimode fiber optics  
are typically driven by LEDs.  
One billionth of a meter.  
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Node to Port Assignment  
Node  
Any single end station on a network capable of receiving,  
processing, and transmitting packets.  
NVRAM  
Non-Volatile Random Access Memory. Memory which is  
protected from elimination during shutdown and between  
periods of activity, frequently through the use of batteries.  
Octet  
A numerical value made up of eight binary places (bits).  
Octets can represent decimal numbers from zero (0000  
0000) to 255 (1111 1111).  
OID  
Object Identifier.  
OSI Model  
Open Standards Interconnect. A model of the way in  
which network communications should proceed from the  
user process to the physical media and back.  
Out-Of-Band  
Packet  
Performed without requiring the operation of the network  
architecture. Most commonly used in reference to local  
management operations.  
A discrete collection of bits that form a block of  
information. Packets are similar to frames, but may be  
made up of control information (frames) or data to be  
transmitted.  
Plenum  
Port  
A cabling term which indicates a cable with insulating  
material that is considered safe to use in return-air plenum  
spaces (in contrast to PVC insulation) due to its low  
relative toxicity if ignited.  
A physical connector which is used as an interface to  
cabling with modular or pinned connectors. Ports are  
associated with Interfaces.  
Port  
Assignment  
The association, through software management, of specific  
ports on a network device to specific channels of a  
backplane. This assignment is done on an individual port  
basis.  
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Protocol to SDRAM  
Protocol  
PVC  
A set of rules governing the flow of information within a  
communications infrastructure. Protocols control  
operations such as frame format, timing, and error  
correction. See also Architecture.  
Polyvinyl Chloride. A material commonly used in the  
fabrication of cable insulation. This term is used to  
describe a non-plenum rated insulating material. See also  
Plenum.  
Redundant  
Repeater  
RJ45  
Extra or contingent. A redundant system is one that is held  
in reserve until an occurrence such as a failure of the  
primary system causes it to be required.  
A network device consisting of a receiver and transmitter  
which is used to regenerate a network signal to increase  
the distance it may traverse.  
A modular connector style used with twisted pair cabling.  
The RJ45 connector resembles the modern home  
telephone connector (RJ11).  
RMIM  
Repeating Media Interface Module. A term used to  
indicate a family of Cabletron Ethernet Media Interface  
Modules (See MIM) which are capable of performing  
their own repeater functions.  
RMON  
Router  
Remote MONitoring. RMON is a network management  
standard which provides more detailed network  
information and status reporting than SNMP.  
A router is a device which connects two or more different  
network segments, but allows information to flow between  
then when necessary. The router, unlike a bridge,  
examines the data contained in every packet it receives for  
more detailed information. Based on this information, the  
router decides wether to block the packet from the rest of  
the network or transmit it, and will attempt to send the  
packet by the most efficient path through the network.  
SDRAM  
Shared Dynamic Random Access Memory.  
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Segment to SQE  
Segment  
A portion of a network which is separated from other  
networks. A segment may be one portion of a bridged,  
switched, or routed network. Segments must be capable of  
operating as their own networks, without requiring the  
services of other portions of the network.  
Server  
SIMM  
A workstation or host device that performs services for  
other devices (clients) on the network.  
Single In-line Memory Module. A collection of Random  
Access Memory microprocessors which are placed on a  
single, replaceable printed circuit board. These SIMMs  
may be added to some devices to expand the capacity of  
certain types of memory.  
Single Mode  
A type of fiber optics in which light travels in one  
predefined mode, or wavelength. Signals in single mode  
fiber optics are typically driven by lasers. The use of lasers  
and the transmission characteristics of single mode fiber  
optics allow the media to cover greater distances than  
multimode fiber optics.  
SMA  
Sub-Miniature Assembly. A modular connector and port  
system used in multimode fiber optic cabling. The SMA  
connector is threaded, and is screwed into an SMA port.  
SNMP  
Simple Network Management Protocol. SNMP is a  
standardized set of network monitoring tools. See also  
RMON.  
Spanning Tree  
A mathematical comparison and decision algorithm  
performed by Ethernet bridges at power-up. Spanning tree  
detects the presence of data loops and allows the bridges to  
selectively activate some ports while others remain in a  
standby condition, avoiding the data loops and providing  
redundant paths in the event of bridge failures.  
SQE  
Signal Quality Error. A self-monitoring test performed by  
some Ethernet equipment which examines the status of the  
device’s connection to the network at arbitrary and  
predefined intervals.  
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ST to Throughput  
ST  
Straight-Tip. A modular connector and port system used  
with both multimode and single mode fiber optic cabling.  
The ST connector utilizes an insert and twist-lock  
mechanism.  
Station  
STP  
See node.  
Shielded Twisted Pair. Refers to a type of cabling, most  
commonly used in Token Ring networks, which consists  
of several strands of cables surrounded by foil shielding,  
which are twisted together. See also UTP.  
Straight-  
Through  
A length of multi-stranded cable in which the transmit  
wire(s) of one end is/are passed directly through the cable  
to the same location on the other end. Straight-through  
cables are used for most facility cabling. See also cross-  
over.  
Subnet  
A physical network within an IP network.  
Subnet Mask  
A 32-bit quantity which may be set up in SNMP  
management devices to indicate which bits in an IP  
address identify the physical network.  
Switch  
A network device which connects two or more separate  
network segments and allows traffic to be passed between  
them when necessary. A switch determines if a packet  
should be blocked or transmitted based on the destination  
address contained in that packet.  
TCP  
Transmission Control Protocol.  
Terminal  
A device for displaying information and relaying  
communications. Terminals do not perform any processing  
of data, but instead access processing-capable systems and  
allow users to control that system.  
Throughput  
The rate at which discrete quantities of information  
(typically measured in Mbps) are received by or  
transmitted through a specific device.  
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Token to UTP  
Token  
A particular type of frame which informs a station in the  
Token Ring and FDDI network architectures that it may  
transmit data for a specified length of time. Once that time  
has expired, the station must stop transmitting and pass the  
token along to the next station in the network.  
Token Ring  
A network architecture which requires that stations only  
transmit data when they have been given permission by the  
reception of a Token, and dictates that stations will receive  
information at pre-determined intervals and in a definite  
series.  
Topology  
The physical organization of stations and devices into a  
network.  
Transceiver  
A device which transmits and receives. A transceiver  
provides the electrical or optical interface to the network  
media, and may convert signals from one media for use by  
another.  
Trap  
User  
See Alarm.  
Any person who utilizes a workstation or node on the  
network. Anyone who will complain if the network is not  
operating.  
UTP  
Unshielded Twisted Pair. A type of network media which  
consists of a number of individual insulated cable strands  
which are twisted together in pairs.  
GL-14  
EMM-E6 User’s Guide  
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INDEX  
Numerics  
C
10BaseT 3-19  
C Channel 1-13  
cd 13-5  
Channel B 1-13  
Channel C 1-13  
Channel D 1-15  
Channel E 1-16  
Channel F 1-16  
Channels A, B, C 1-12  
Class A/B/C 1-24  
Collision handling 1-18  
Command Set 13-3  
Community Names 1-21, 3-5  
Setting 6-1  
A
A Channel 1-12  
Address Classes  
identifying 1-25  
Addressing 1-22  
ARP B-2  
arp 13-11  
Attenuation  
Multimode 2-4  
SingleMode 2-5  
Twisted Pair 2-3  
Connecting to the Network 3-18  
Crosstalk 2-3  
ctron 13-5  
CXRMIM 2-7  
B
B Channel 1-13  
Backplane 1-10  
Basic read only 1-21  
Basic-Read 6-2  
Baud Rate Default 3-4  
BOOTP 3-4  
BPDU 1-19  
branch 13-4  
Bridge 1-17  
BRIM 1-16  
D
D Channel 1-15  
Data Link Level 1-17  
Data loops (STA) 1-19  
Default Gateway 1-30  
Default Gateway, setting 7-6  
Device Statistics screen 11-1  
Diagnostic LEDs 14-1  
Dimensions A-4  
BRIMs 1-5, 3-10  
Dip Switches 3-3  
dir 13-6  
Distributed LAN Monitor (DLM)  
1-9  
done 13-16  
Dot notation 13-4  
Dotted Decimal Notation 1-23  
Download OIDs 15-7  
EMM-E6 User’s Guide  
Index-i  
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E
I
E Channel 1-16  
Eavesdrop Prevention 1-33  
EMM-E6  
IANA 1-23  
Image File - Download 15-1  
Impedance  
Features 1-4  
10BaseT 2-2  
Enabling Ports 7-9  
EPIMs 1-7  
Insertion Loss  
10BaseT 2-2  
Errors, statistics 11-2  
exit 13-16  
Installing 3-13  
Interface number 7-2  
Introduction 1-1  
Intruder Prevention 1-33  
IP addresses 1-23  
F
F Channel 1-16  
Fault Tolerant Wiring 2-12  
Filter 1-18  
L
Filter Rate A-1  
LANVIEW 14-1  
Firmware Upgrades 15-1  
Flash Memory 1-7  
Flexible Network Bus 1-10  
Forced download 15-1  
FORMIM-22 2-7  
Forward Rate A-1  
Forwarding 1-18  
CLN 14-3  
CPU 14-2  
RCV 14-2  
STBY 14-2  
XMT 14-3  
LANVIEWSECURE 1-33  
Latency A-1  
LEDs 1-33, 14-1  
Link Length  
10BaseT 2-2  
Multimode fiber 2-4  
Single Mode 2-5  
Thin coax 2-6  
Local Download 15-1  
ls 13-6  
G
GET 1-21  
get 13-6  
Grounding 2-6  
H
help 13-7  
Host ID 1-23  
Host IP Address 7-4  
Index-ii  
EMM-E6 User’s Guide  
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M
P
MAC address 1-22  
Memory 3-6, A-1  
EEPROM 1-7  
Partitioning Networks 1-25  
Password 3-5  
Screen 5-1  
Local Dynamic 1-8  
Shared Dynamic 1-8  
MIB 1-22  
Setting 6-1  
ping 13-12  
Ports  
access 13-2  
description 13-1  
hierarchy 13-1  
enabling 7-9  
Pinouts A-3  
unlocking 7-9  
Propagation Delay  
10BaseT 2-3  
multimode fiber 2-4  
pwd 13-8  
managing devices 13-1  
mib2 13-7  
Mode Switches 3-3  
Multi Media Access Center 1-10  
N
Q
Natural Mask 1-26  
netstat 13-12  
Network ID 1-23  
next 13-7  
quit 13-16  
R
Read only 1-21  
Read write 1-21  
Read-Only 6-2  
Non-Volatile RAM 3-5  
O
Read-Write 6-2  
Remote runtime download 15-1  
Requirements  
OID 1-22, B-1  
description 13-1  
editing/viewing 9-1  
getting 9-4  
10BaseT 2-2  
Fiber Optic 2-4, 2-5  
Thin Coax 2-6  
setting 9-5  
OSI model 1-17  
Reset Switch 1-33, 14-7  
RIC MIM 1-13, 2-7  
RMON  
Groups Supported 1-8  
EMM-E6 User’s Guide  
Index-iii  
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S
T
Safety A-4  
Technical Support 1-35  
Sample Configurations 2-9  
Security 1-33  
Community names 1-21  
SET 1-21  
Telnet 13-2  
Terminals, configuration 4-1  
THN-MIM 3-4  
TPRMIM 2-7  
set 13-8  
TPXMIM 2-8  
SIMM Upgrade 3-6  
Slash notation 13-4  
SNMP 1-21  
traceroute 13-15  
Transceivers 2-6  
Trap 1-21  
SNMP Tools screen 9-1  
SNMP Traps 8-1  
snmpbranch 13-13  
snmpget 13-13  
Trap Table, configuring 8-2  
tree 13-9  
Troubleshooting 14-1  
snmpset 13-14  
U
snmptree 13-14  
Spanning Tree Algorithm 1-19  
Specifications A-1  
Environmental A-3  
Statistics, viewing 11-1  
su 13-9  
Unlocking Ports 7-9  
Unpacking 3-2  
Update Frequency 11-4  
UPS support 7-8  
Subnet 1-26  
W
Subnet address 1-25  
Subnet Mask 1-26  
Modifying 7-5  
whoami 13-10  
Operation 1-30  
Super user 1-21, 6-2  
Default password 5-2  
Index-iv  
EMM-E6 User’s Guide  
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EMM-E6 QUICK REFERENCE CARD  
LANVIEW LEDs  
LED  
DESCRIPTION  
Flashing Green: Board Operating  
Properly.  
CPU  
Red: CPU error condition.  
EMM-E6  
SN  
STBY  
A, B, C, D  
Amber indicates port or interface  
placed in standby state.  
RESET  
CPU  
B
Green indicates valid link from station  
to EMM-E6 interface.  
D
C
A
RCV  
STBY  
RCV  
XMT  
CLN  
A, B, C, D  
Amber indicates segment receiving  
traffic.  
Green indicates segment is  
transmitting traffic.  
XMT  
A, B, C, D  
Flashing red indicates port in standby  
due to spanning tree operation.  
Red indicates collision detected on  
segment. Occasional activation of CLN  
LED is normal.  
CLN  
A, B, C, D  
SWITCH SETTINGS  
Switch  
Function  
1
2
3
Cabletron Systems Use Only. Must be in OFF position.  
Cabletron Systems Use Only. Must be in OFF position.  
Cabletron Systems Use Only. Must be in OFF position.  
MIMREV. Should be OFF unless THN-MIM s with part numbers below  
9000043-05 are located in the MMAC.  
4
5
6
7
Baud Rate Default. Sets local management console port baud rate. OFF  
(default) = 9600 Baud, ON = 2400 baud.  
Forced Download. When toggled, forces image files to be loaded from  
BOOTP server by clearing information from NVRAM.  
NVRAM Reset. When toggled, deletes user parameters stored in NVRAM  
and returns these parameters to factory default settings.  
Password Default. When toggled, deletes user defined passwords stored  
in NVRAM and returns these passwords to factory default settings (public  
or [Return]).  
8
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EMM-E6 QUICK REFERENCE CARD  
INSTALLATION  
•
Slide the EMM-E6 into the first and second slots of the MMAC chassis (as  
shown below).  
EMM-E6  
•
Secure the module by tightening the knurled knobs at the top and bottom of  
the module.  
•
•
Power on the MMAC chassis. Monitor the state of the CPU LED.  
The CPU LED will flash, indicating the EMM-E6 is in boot state. During this  
period, which may last up to 5 minutes, the STBY LEDs will blink to indicate  
the module’s boot state.  
•
Fully operational EMM-E6 should display the following LED states:  
-
-
CPU LED flashing, indicating normal operation.  
STBY LEDs lit or unlit, depending on the results of  
spanning tree operation.  
-
-
Appropriate BRIM/EPIM LEDs lit.  
ON LED lit for the active Channel D EPIM.  
TERMINAL SETUP  
Use the following setup parameters for a VT Terminal or Terminal Emulation  
package to connect to Local Management functions.  
Interpret  
Controls  
Columns:  
Scroll:  
80 Columns  
Jump Scroll  
VT300, 7 Bit  
Controls:  
Text Cursor:  
ID Number:  
Autowrap:  
Cursor Style:  
Cursor Keys:  
No Autowrap  
Underline  
Normal  
Cursor  
VT320 or  
VT100  
Mode:  
Transmit:  
Bits:  
9600  
Receive:  
Parity:  
9600  
XOFF:  
XOFF at 64  
1 Stop Bit  
8 Bits  
No Parity  
Stop Bit:  
No Local  
Echo  
Auto  
Answerback:  
No Auto  
Answerback  
Local Echo:  
Keys:  
Port:  
DEC-423  
Typewriter  
Keys  
Warning  
Bell:  
Margin Bell:  
Margin Bell  
Warning Bell  
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