Cabletron Systems Switch ELS100 24TXG User Manual

SmartSTACK 100

ELS100-24TXG

ETHERNET SWITCH

INSTALLATION

AND

USER GUIDE

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DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from dig-

ital 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.

VCCI NOTICE

This is a Class A product based on the standard of the Voluntary Control Council for Interfer-

ence by Information Technology Equipment (VCCI). If this equipment is used in a domestic

environment, radio disturbance may arise. When such trouble occurs, the user may be re-

quired to take corrective actions.

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 firm-

ware, chips or other media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREE-

ING 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.

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 per-

mitted 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 disassem-

ble 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.

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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 Pro-

gram (including its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUP-

PLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IM-

PLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RE-

SPECT 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 WHATSO-

EVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSI-

NESS, 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 AD-

VISED OF THE POSSIBILITY OF SUCH DAMAGES. BECAUSE SOME STATES

DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CON-

SEQUENTIAL OR INCIDENTAL DAMAGES, OR ON THE DURATION OR LIMI-

TATION OF IMPLIED WARRANTIES, IN SOME INSTANCES THE ABOVE

LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

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 succes-

sors, 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 re-

strictions 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 03867-0505.

SAFETY INFORMATION

LASER RADIATION AND CONNECTORS

When the connector is in place, all laser radiation remains within the fiber. The maximum

amount of radiant power exiting the fiber (under normal conditions) is -12.6 dBm or 55 x 10 ^-

⁶watts. Removing the optical connector from the transceiver allows laser radiation to emit

directly from the optical port. The maximum radiance from the optical port (under worst case

conditions) is 0.8 W cm ^-2or 8 x 10 ³W m ²sr^-1.

Do not use optical instruments to view the laser output. The use of optical instruments to view

laser output increases eye hazard. When viewing the output optical port, power must be re-

moved from the network adapter.

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DECLARATION OF CONFORMITY

Application of Council Directive(s):

89/336/EEC

73/23/EEC

Manufacturer’s Name:

Cabletron Systems, Inc.

Manufacturer’s Address:

35 Industrial Way

PO Box 5005

Rochester, NH 03867

European Representative Name:

European Representative Address:

Mr. J. Solari

Cabletron Systems Limited

Nexus House, Newbury Business Park

London Road, Newbury

Berkshire RG13 2PZ, England

Conformance to Directive(s)/

Product Standards:

EC Directive 89/336/EEC

EC Directive 73/23/EEC

EN 55022

EN 50082-1

EN 60950

Equipment Type/Environment:

Networking Equipment, for use in a Com-

mercial or Light Industrial Environment.

We the undersigned, hereby declare, under our sole responsibility, that the equip-

ment packaged with this notice conforms to the above directives.

Manufacturer

Legal Representative in Europe

Mr. J. Solari

Mr. Ronald Fotino

Full Name

Principal Compliance Engineer

Title

Managing Director - E.M.E.A.

Title

Rochester, NH, USA

Location

Newbury, Berkshire, England

Location

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TABLE OF CONTENTS

PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Message Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Keyboard Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Other Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi

Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi

1. PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Feature Summaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

IEEE 802.1D Bridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Spanning Tree Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Frame Buffering and Frame Latency. . . . . . . . . . . . . . . . . . . . . . . . 6

Software Download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Non-volatile Parameter Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Configuration and Management Interfaces . . . . . . . . . . . . . . . . . . . 7

RMON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Port Mirroring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Auto-negotiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Broadcast Throttling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

BootP/DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Full Duplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Flow Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Virtual LANs (VLANs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Client/Server Network Application . . . . . . . . . . . . . . . . . . . . . . . . . 11

Local Backbone Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2. INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Inspecting Your Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Mounting the Switch on a Table or Shelf . . . . . . . . . . . . . . . . . . . . . . . 14

Mounting the Switch on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Mounting the Switch in a Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Connecting a Terminal to the Console Port . . . . . . . . . . . . . . . . . . . . . 17

Powering the Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Power-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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Network Cable Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Fiber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

10Base-T/100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1000Base-X Gigabit Ethernet Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3. ELS100-24TXG USER INTERFACE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

User Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Factory Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Menu Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

System Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

SNMP Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Switch Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Forwarding Table Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . 31

Spanning Tree Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Spanning Tree Port Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . 35

Spanning Tree Port #n Configuration Menu. . . . . . . . . . . . . . . . . . . . . 36

VLAN Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

VLAN Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

VLAN #n Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

VLAN Port Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Class of Service Configuration Menu. . . . . . . . . . . . . . . . . . . . . . . . . . 41

Port Priority Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Port Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Port Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Switch Statistics Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Switch Summary Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Port Statistics Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

General Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Download Software Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Save Current Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Return to Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4. CONFIGURING & MONITORING THE SWITCH . . . . . . . . . . . . . . . . . . . . . 53

Common Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Setting Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Assigning an IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Checking Network Configuration Status. . . . . . . . . . . . . . . . . . . . . . . . 55

Connecting via Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Setting SNMP Management Access . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Viewing Switch Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Configuring Port Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Downloading a Software Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Downloading Via the Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Downloading Via TFTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

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ELS100-24TXG

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Configuring Spanning Tree Parameters . . . . . . . . . . . . . . . . . . . . . . . . 58

Configuring VLANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Configuring Class of Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Configuring Port Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Configuring the Forwarding Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Configuring Broadcast Cutoff Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Setting a Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Configuring BootP/DHCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5. SNMP MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

The SNMP Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

MIB Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

RFC 1213 (MIB-II) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

RFC 1398 (Ethernet MIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

RFC 1493 (Bridge MIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

RFC 1757 (RMON MIB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Cabletron Proprietary MIB Extensions. . . . . . . . . . . . . . . . . . . . . . 67

Compiling MIB Extensions: Cabletron Website. . . . . . . . . . . . . . . . . . . 70

APPENDIX A. TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 71

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Standards Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Data Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Port Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Console Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

10Base-T and 100Base-TX Ports . . . . . . . . . . . . . . . . . . . . . . . . . 73

MDI/MDI-X Crossover Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . 74

Power Cord Set Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

General Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Country-Specific Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

APPENDIX B. SPANNING TREE CONCEPTS. . . . . . . . . . . . . . . . . . . . . . . . . 77

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Spanning Tree Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Spanning Tree Protocol in a Network . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Spanning Tree Protocol Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Spanning Tree Protocol Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Communicating Between Bridges . . . . . . . . . . . . . . . . . . . . . . . . . 80

Selecting a Root Bridge and Designated Bridges . . . . . . . . . . . . . 80

Selecting Designated Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Handling Duplicate Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Remapping Network Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

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APPENDIX C. FLOW CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

APPENDIX D. VIRTUAL LANS (VLANS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

VLANs and Frame Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

ELS100-24TXG VLAN Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 84

VLAN ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Ports in VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

VLAN Egress Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

VLAN Access Ports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

VLAN Hybrid Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

VLAN Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

APPENDIX E. CLASS OF SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

APPENDIX F. ACRONYMS & ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . 91

INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

iv Table Of Contents

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PREFACE

Purpose

This guide provides information about the features and applications of the

Cabletron ELS100-24TXG switch as well as instructions for configuring

and monitoring the switch.

Audience

This guide is intended for Ethernet local area network (LAN)

administrators and Management Information Systems (MIS) personnel

with the following background:

•

Working knowledge of Ethernet LANs

Familiarity with Transmission Control Protocol/Internet Protocol

(TCP/IP) and Simple Network Management Protocol (SNMP)

Conventions

This section describes the conventions used in this guide.

Message Formats

Two types of messages, identified by icons, appear in the text:

A note informs you of special circumstances.

A caution indicates the possibility of equipment damage.

Keyboard Entries

This guide uses the following conventions for keyboard entries:

•

When you read “enter,” type the text and press the [Enter] key.

Example: Enter the Gateway IP address and press the [Enter] key.

When you read “select,” type the letter associated with the

parameter.

Example: Select a from the System Configuration Menu to view the

SNMP Configuration Menu.

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Other Conventions

This guide uses the following typographical conventions:

•

Initial Caps

[Enter]

Menu titles and console menu selections.

Used to designate the Enter or Return key.

ALL CAPS

Used to designate fields within the console menus

(Example: CONNECTION).

• courier font Screen messages and user prompts.

•

Selection

Field

Describes a user-configurable user interface item.

Describes a read-only information item.

Organization

Chapter 1. Product Overview: Describes the features of the switch, front

and rear panel components and application examples.

Chapter 2. Installation: Describes the content of your switch shipment,

lists site requirements, and provides mounting instructions. Instructions

for making connections and powering up the switch are provided as well.

Chapter 3. ELS100-24TXG User Interface: Describes the user interface

console menus and lists the factory defaults for system settings. Each of

the console menus are presented along with a description of the

selections/fields available within each menu.

Chapter 4. Configuring and Monitoring the Switch: Describes

common tasks and associated steps required to configure the switch, and

covers common switch and network considerations required to ensure

system integrity.

Chapter 5. SNMP Management: Describes how the Simple Network

Management Protocol (SNMP) communication protocol is used to

manage the switch, and provides a description of industry standard and

proprietary Managed Information Bases (MIBs) supported by the switch.

Appendix A. Technical Specifications: Provides a list of standards

compliance and certifications as well as physical and operational

specifications.

Appendix B. Spanning Tree Concepts: Describes the operation of the

Spanning Tree Protocol and how it is used to resolve the problems of

physical loops in a network.

Appendix C. Flow Control: Describes how the flow control features are

used to provide a mechanism for protecting the switch from overload

conditions and to keep additional traffic off the network.

Appendix D. Virtual LANs (VLANs): Describes how the switch uses

VLANs to create isolated network domains, and provides illustrations of

VLAN switch configurations.

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Appendix E. Class of Service: Describes how the traffic Class of Service

features can be used to assign mission-critical data a higher priority

through the switch by delaying less critical traffic during periods of

congestion.

Appendix F. Acronyms and Abbreviations: Provides definitions for a

list of common acronyms and abbreviations used within the user guide

and the networking industry.

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1. PRODUCT OVERVIEW

Description

This installation and user guide describes the Cabletron ELS100-24TXG

Ethernet switch. The switch is IEEE 802.1D-compliant and supports 24

IEEE 802.3u 100Base-TX Fast Ethernet ports. Each port can alternatively

operate as an IEEE 802.3i 10Base-T port. Additionally, the switch

features 2 Gigabit Ethernet ports which operate at 1 Gbps. These ports

support the various physical media transceiver flavors of IEEE 802.3z

Gigabit Ethernet through the use of modular Gigabit Interface Converters

(GBICs). Supported media includes multi-mode fiber, single mode fiber,

and twinax copper.

The Cabletron ELS100-24TXG switch automatically learns end-station

addresses from the network and stores them in a Media Access Control

(MAC) address forwarding table. Incoming packets are then forwarded to

the appropriate output port based on the addresses in the packet. Each

port on the switch operates at full wire speed with full address and frame

filtering.

The Cabletron ELS100-24TXG switch contains advanced features such

as Remote Monitoring (RMON), IEEE 802.1Q virtual LANs (VLANs),

IEEE 802.1p Class of Service, flow control and broadcast throttling. For

network management, the ELS100-24TXG switch includes a standards-

compliant Simple Network Management Protocol (SNMP) agent. This

agent allows network management station applications to collect and

present status and performance information about a switch as well as

providing the ability to configure and control functions on the device.

Network management can also be performed in-band using the popular

TCP/IP application, Telnet. In addition, a serial console port allows out-of-

band management using a PC or a terminal. The ELS100-24TXG switch

is desktop or rack-mountable. LEDs on the front panel provide information

about the operating status of the switch. The back panel of the switch

contains the power connector and a power switch. Two fans maintain

ventilation and cooling for internal switch components.

This chapter provides the following information:

•

Product Description

Features

Front and Rear Panel Component Descriptions

Feature Summaries

Application Examples

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Features

•

Ports:

- 24 dual-speed 10Base-T/100Base-TX ports using RJ-45

connectors (MDI-X)

- 2 1000Base-X Gigabit Ethernet ports using modular GBIC

transceivers

•

Architecture:

- 8-port 10/100 and 1-port Gigabit Ethernet switch ASICs in a

distributed switching architecture

- 4.2 Gbps internal switching fabric

- 12 MB packet buffering (512 KB/port) for 10/100 ports

- 16 MB packet buffering (8 MB/port) for Gigabit Ethernet ports

- 4096 MAC address forwarding table per port; up to 16,384

addresses per system

- IEEE 802.3u auto-negotiation for full/half duplex and 10/100

Mbps speed operation on all RJ-45 10/100 ports

- High performance store-and-forward switching

•

Performance:

- Forwarding: over 6 million packets-per-second (64 byte

packets)

- Filtering: 6.5 million packets-per-second (64 byte packets)

Traffic Management:

- Tag and port-based VLANs per the IEEE 802.1Q draft

standard - 4094 VLAN IDs recognized per switch

- Class of Service support per the IEEE 802.1p draft standard

- Flow control per port: IEEE 802.3x frame-based for full duplex;

back-pressure for half duplex

- Broadcast throttling for broadcast storm control

•

Network Management:

- SNMP compliant agent: MIB II (RFC 1213); Bridge MIB (RFC

1493); Ethernet MIB (RFC 1398); RMON - Statistics, History,

Alarm and Event groups per port (RFC 1757); private MIB

extensions

- Port mirroring for network monitoring and analysis

- Telnet

- Console port, RS-232, female DB-9 connector, null modem

- BootP/DHCP for IP address configuration

•

LED Indicators

- 10Base-T/100Base-TX Ethernet ports: Link, Activity, 100Mbps

Speed, Full Duplex

- 1000Base-X Gigabit Ethernet ports: Link and Activity

- System: Power, Test

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•

Software:

- Extensive diagnostics for product testing and troubleshooting

- Upgrades using the front panel console port or in-band with

TFTP

Front Panel

Figure 1-1 shows the front panel of the Cabletron ELS100-24TXG. Table

1-1 defines the ELS100-24TXG front panel components.

Figure 1-1. ELS100-24TXG Front Panel

Table 1-1. Front Panel Components

Function

Name

Gigabit Ethernet ports 25

Indicates Link and Activity information (see Table 1-2

for details).

and 26 LEDs

1000Base-X Gigabit

Ethernet ports

Gigabit Ethernet ports using GBIC modules.

Ports 1-24 LEDs

Indicates Link, Activity, Speed and Duplex information

(see Table 1-2 for details).

10Base-T/100Base-TX

RJ-45 ports

Copper ports using RJ-45 port connectors. These

ports are wired MDI-X.

LED mode button

Button used to switch RJ-45 port LEDs between Link/

Activity mode and 100M/Full Duplex mode. This button

has no affect on Gigabit Ethernet port LEDs.

Power LED

Test LED

Lights steady green to indicate power is supplied to the

switch. Off indicates no power is supplied to the switch.

Lights steady green after a reset and remains on until

successful completion of power-on self tests. Off indi-

cates a successful completion of the power-on self

tests.

Console port

Female DB-9 connector configured as a null modem

connection for serial out-of-band management using

the console menus.

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Figure 1-2 shows the Link and Activity LEDs for the 2 1000Base-X

Gigabit Ethernet ports. The LEDs are positioned to the left of their

associated port.

Link LEDs

Activity LEDs

Figure 1-2. 1000Base-X Gigabit Ethernet Port LEDs

Figure 1-3 shows the Link and Activity port LEDs for 24 10Base-T/

100Base-TX ports (default configuration).

Pressing the front panel LED mode button changes the operation of the

RJ-45 LEDs to show Speed and Full Duplex operation, as shown in

Figure 1-4.

The numbers above and below the port LEDs identify the

LEDs associated with a specific RJ-45 port.

Link

Activity

Link

Activity

Link

Activity

Link

Activity

Figure 1-3. Port LEDs Default Configuration

10/100 speed

Full/half duplex

10/100 speed

Full/half duplex

10/100 speed

Full/half duplex

10/100 speed

Full/half duplex

Figure 1-4. Port LEDs LED Mode Button Pressed

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The port LEDs are grouped to the left of their corresponding RJ-45 ports.

Table 1-2 defines the performance of the port LEDs for the 10Base-T/

100Base-TX ports in both the default configuration and with the LED

mode button pressed.

Table 1-2. Port LEDs Defined

Name

Function

Gigabit

Link LED On: Indicates a valid connection (link) on the associated port.

Ethernet Ports

Link LED Off: Indicates no link on the associated port.

Activity LED flashing: Indicates the presence of transmit and/or re-

ceive activity.

Activity LED Off: Indicates the absence of transmit or receive activity.

RJ-45 Ports

Default

Configuration

Link LED On: Indicates a valid connection (link) on the associated port.

Link LED Off: Indicates no link on the associated port.

Activity LED flashing: Indicates the presence of transmit and/or re-

ceive activity.

Activity LED Off: Indicates the absence of transmit or receive activity.

RJ-45 Ports

LED mode

button pressed

Speed LED On: Indicates the port is in the 100Base-TX mode.

Speed LED Off: Indicates the port is in the 10Base-T mode.

Duplex LED On: Indicates the port is in the full duplex mode.

Duplex LED Off: Indicates the port is in the half duplex mode.

Rear Panel

Figure 1-5 shows the ELS100-24TXG rear panel and Table 1-3 defines

the rear panel components.

Figure 1-5. ELS100-24TXG Rear Panel

Table 1-3. Rear Panel Components

Function

Name

Power Connector

Power Switch

Fan Outlets

Provides AC power to the switch.

Allows you to turn the switch power on and off.

Air exit vents through which internal fans discharge air

for ventilation purposes.

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Feature Summaries

The following summaries provide a brief description of ELS100-24TXG

features in areas such as standards compliance, functionality,

performance, and options.

IEEE 802.1D Bridge

The ELS100-24TXG switch is fully compliant with IEEE 802.1D

transparent bridging specifications. An aggregate address table,

containing 4096 entries per 8 10/100 ports and per Gigabit Ethernet port,

is provided for learning, filtering, and forwarding. The switch can support

up to a maximum of 16,384 addresses. Addresses are automatically

learned by the switch, and can be individually assigned specific

forwarding treatment by the network administrator if desired. Forwarding

table configuration can be made out-of-band via the console interface or

in-band via SNMP or Telnet. Static and dynamic addresses are both

stored in this table. One static address is assigned per port by default. The

Forwarding Table Configuration screen in the console menus allows you

to assign additional static addresses if required.

Spanning Tree Protocol

The ELS100-24TXG switch supports the IEEE 802.1D Spanning Tree

Protocol. This protocol allows redundant connections to be created

between different LAN segments for purposes of fault tolerance. Two or

more physical paths between different segments can be created through

the switch, with the Spanning Tree Protocol choosing a single path at any

given time and disabling all others. If the chosen path fails for any reason,

a disabled alternative is activated, thereby maintaining the connection.

This prevents network traffic from circulating in an endless loop formed by

multiple connections to the same LAN segment.

Spanning Tree parameters are configurable in the Spanning Tree

Configuration Menu using the console menus or via SNMP (see Appendix

B, “Spanning Tree Concepts,” for more information).

Frame Buffering and Frame Latency

The ELS100-24TXG switch is a store-and-forward switching device. Each

frame is copied into switch memory before being forwarded to another

port. This method ensures that all forwarded frames conform to a

standard Ethernet frame size and have a correct cyclic redundancy check

(CRC) for data integrity. This switching method prevents bad frames from

traversing the network and using up valuable network bandwidth, as with

cut-through switching technology.

To minimize the possibility of dropping frames on congested ports, the

ELS100-24TXG switch provides 512 KB per 10/100 port and 8 MB per

Gigabit Ethernet port of dynamically allocated frame buffering. This buffer

space is used to queue packets for transmission on congested networks.

This is an additional advantage over cut-through switching technology,

which drops packets immediately when experiencing collisions.

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Software Download

The ELS100-24TXG switch supports the industry-standard Trivial File

Transfer Protocol (TFTP) for downloading software to the switch. All

switch software is stored in a 2 MB sectored flash ROM. The download

feature allows you to easily install software upgrades to the unit. Software

can alternatively be downloaded via the serial console port using the

XMODEM protocol.

A TFTP or XMODEM software download is invoked via the Download

Software Menu using the console menus. A TFTP download can also be

invoked via SNMP.

Non-volatile Parameter Storage

Important operating parameters such as IP addresses, Spanning Tree

configuration, and management security parameters, are stored in non-

volatile Flash memory. These values are retained when the switch

experiences power interruptions or is powered down for normal

maintenance.

Configuration and Management Interfaces

The ELS100-24TXG switch can be managed using any of the following

three methods:

•

Serial console, out-of-band

An RS-232 connection, using a DB-9 connector, is supported for out-of-

band switch management. Serial console management is performed

using a terminal, or computer system running communications software.

See Chapter 3, “ELS100-24TXG User Interface,” for more detailed

information on managing the ELS100-24TXG switch via the serial

console.

•

Telnet, in-band (over Ethernet)

The switch supports management through a Telnet connection using the

TCP/IP protocols. Telnet is performed using a terminal or computer

system running communications software. See Chapter 3, “ELS100-

24TXG User Interface,” for more detailed information on managing the

switch via the serial console. Global password protection for changing the

operating parameters of the switch is provided.

•

SNMP-based network manager, in-band

The switch can be managed using SNMP, the most common protocol

used today for network management. Standard agent MIBs embedded in

the switch provide basic SNMP management through industry-standard

SNMP applications.

Management security protection is provided based on SNMP community

names. See Chapter 5, “SNMP Management,” for more information.

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RMON

RMON (Remote Monitoring) is a facility used to manage networks

remotely while providing multi-vendor interoperability between monitoring

devices and management stations. RMON is defined by an SNMP MIB.

This MIB is divided into nine different groups, each gathering specific

statistical information or performing a specific function. RMON-capable

devices gather network traffic data and then store them locally until

downloaded to an SNMP management station.

The ELS100-24TXG supports four of the nine groups of RMON defined

for Ethernet networks on a per port basis. Specifically, these are:

•

Statistics: a function that maintains counts of network traffic statistics

such as number of packets, broadcasts, collisions, errors, and

distribution of packet sizes.

History: a function which collects historical statistics based on user-

defined sampling intervals. The statistical information collected is the

same as the Statistics group, except on a time stamped basis.

Alarm: a function that allows managers to set alarm thresholds based

on traffic statistics. Alarms trigger other actions through the Event

group.

Event: a function that operates with the Alarm group to define an

action that will be taken when an alarm condition occurs. The event

may write a log entry and/or send a trap message.

RMON Statistics group information is displayed on the Port Statistics

Screen in the console menus. Additional RMON functionality is available

via SNMP.

Port Mirroring

The ELS100-24TXG switch includes the ability to mirror the traffic being

switched on any 10/100 port for purposes of network traffic analysis and

connection integrity. When this feature is enabled, a protocol analyzer or

RMON probe is connected to any port in a group of eight. This port is

configured to mirror the traffic from any other port in the same group of

ports. The groupings are ports 1-8, 9-16 and 17-24. You can only mirror

one port to another port at one time. Port mirroring occurs at the same

speed configured for the port (10Mbps-to-10Mbps or 100Mbps-to-

100Mbps). Port mirroring is configurable in the Switch Configuration

Menu using the console menus or via SNMP.

Auto-negotiation

Auto-negotiation is a process that permits the switch to automatically

select the operational mode of its ports. For 10/100 ports, the switch

automatically detects and selects the speed (10Mbps or 100Mbps) and

duplex mode (full duplex or half duplex) of a port upon being connected

to the network. For Gigabit Ethernet ports, the switch automatically

detects and selects the flow control mode of the port. The ports are then

automatically set by the switch to operate in the proper mode, without

user intervention. It is not required that the network device being

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connected to the switch supports auto-negotiation as the ELS100-24TXG

switch automatically adjusts to the network device's communication

settings. Auto-negotiation is configurable in the Port Configuration Menu

of the console menus or via SNMP.

Broadcast Throttling

The ELS100-24TXG has the capability to throttle (or limit) the flooding of

packets through the switch. Broadcast, multicast, and unknown

destination address unicast packets received by the switch are typically

flooded to all ports on the switch or on a given VLAN. When the number

of these types of packets being forwarded is large, the performance of the

switch in forwarding packets of other types may suffer. A programmable

broadcast cutoff rate parameter allows a rate threshold to be set in the

switch for the forwarding of broadcast and unknown destination address

packets. If the cutoff rate is exceeded, further packets of these types are

dropped. This capability helps to alleviate broadcast storms, a problem

often encountered in Ethernet networks. Broadcast throttling is

configurable in the Switch Configuration menu of the console menus or

via SNMP.

BootP/DHCP

The Bootstrap Protocol (BootP) and the Dynamic Host Configuration

Protocol (DHCP) provide for the capability of passing configuration

information to hosts on a TCP/IP network. Using this process, network

devices do not need to be configured before they can communicate using

the TCP/IP protocol suite. The ELS100-24TXG switch uses BootP and

DHCP to automatically configure IP address information without requiring

access to the console menus. BootP/DHCP operation is configurable

using the BootP/DHCP Enable option in the System Configuration Menu

of the console menus or via SNMP.

LEDs

The switch port LEDs provide a quick and accurate display of the integrity

of switch connections and port mode. The default operation of the 10/100

LEDs indicates Link (L) and Activity (A) for each of the ports. The

operation of these LEDs can be changed by use of the LED mode button

on the switch front panel. When the LED mode button is pressed (pressed

and held in), the operation of the 10/100 LEDs changes to indicate 10/100

Mbps speed and full/half duplex operation, respectively. The Gigabit

Ethernet port LEDs indicate Link (L) and Activity (A) for each of the ports.

The Gigabit Ethernet port LEDs are not affected by the LED mode button.

Full Duplex Mode

The full duplex mode of operation on a port can double the throughput of

switch connections. This mode disables the collision detection portion of

the Ethernet Carrier Sense Multiple Access with Collision Detection

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(CSMA/CD) protocol, allowing for two-way traffic. Full duplex is

configurable using the Duplex Mode parameter in the Port Menu of the

console menus or via SNMP.

Flow Control

Flow control allows you to manage network traffic during congestion

periods and to prevent the loss of packets when port buffer thresholds are

exceeded. Flow control also serves to deny access to additional traffic

that could add to a congestion condition. The ELS100-24TXG switch

supports flow control per the IEEE 802.3x standard. See Appendix C,

“Flow Control,” for more information on this feature.

Virtual LANs (VLANs)

VLANs allow you to connect users to a specific LAN segment regardless

of their physical location. The ELS100-24TXG switch supports tagged

VLANs per the IEEE 802.1Q draft standard. With frame tagging, a short

tag is appended to every frame that crosses the network backbone. The

tag identifies which VLAN the frame belongs to. See Appendix D, “Virtual

LANs,” for more information.

Class of Service

Class of Service support allows you to assign a higher priority to selected

traffic passing through the switch. The ELS100-24TXG switch supports

Class of Service attributes per the IEEE 802.1p draft standard using a

priority queuing mechanism. This feature ensures that traffic during

congestion periods will not interfere with traffic assigned a higher priority.

Traffic assigned a lower priority is subject to discard when memory is in

short supply. See Appendix E, “Class of Service,” for more information.

Application Examples

The exploding popularity of the Internet and of corporate intranets, as well

as new, high-bandwidth desktop applications, are driving the demand for

Fast Ethernet. The increase in multimedia traffic and the need to support

legacy protocols alongside new, data intensive applications is driving the

need for network segmentation and traffic prioritization.

The ELS100-24TXG switch is ideal for meeting the needs of today’s high

performance networks. The switch’s low cost and high port count makes

it attractive and affordable for dedicated 10/100Mbps connections to the

desktop. In addition, extensive features, including redundant links, traffic

Class of Service and VLAN capability, provide the management needed

for the workgroup and local backbone.

The following sections illustrate the ELS100-24TXG switch employed in

application examples:

•

Client/Server Network

Local Backbone

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Client/Server Network Application

To improve workstation performance in a client/server environment, the

ELS100-24TXG switch can be configured to provide 200 Mbps full duplex

Fast Ethernet connections to servers by connecting each to a dedicated

switch port (Figure 1-6). Users can be accommodated through

connections to hubs, both at 10Mbps and 100Mbps speeds, through

10Mbps switches with 100Mbps uplinks, or through direct connections.

The Gigabit Ethernet uplinks (1000Mbps) can be used to aggregate traffic

on the switch to the campus or corporate backbone, whether on another

building floor or in a separate building.

Figure 1-6. Client/Server Network Application

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Local Backbone Application

The ELS100-24TXG switch can be used in a local backbone application,

connecting network segments together and providing file-server access

(Figure 1-6). Workgroup hubs are provided with a single connection to the

switch while servers are put on dedicated 100Mbps ports. Routers and

other networking devices can connect off of the switched backbone as

well. The Gigabit Ethernet uplinks (1000Mbps) can be used to connect to

the corporate backbone and provide access to high performance servers.

Figure 1-7. Local Backbone Application

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2. INSTALLATION

Inspecting Your Shipment

When you receive the shipment of your switch, check the package

contents and make sure you have the following items:

•

ELS100-24TXG Fast Ethernet switch

Mounting ears and mounting screws

Power cord

This document

Site Requirements

Before you install the switch, make sure the site meets the following

requirements:

•

Mounting

Provide a flat table, wall or shelf surface, or an optional 19 in. (48.3

cm) equipment rack.

Use an EIA standard equipment rack that is grounded and physically

secure.

•

Power source

Provide a power source within six feet (1.8 m) of the installation loca-

tion. This source must provide 100 VAC to 240 VAC, and 50 Hz to 60

Hz power, with a 100 VA minimum. Power specifications for the

switch are shown in Appendix A, “Technical Specifications.”

Primary voltage selection within the above ranges is

automatic and requires no user action.

•

Environmental

Install the ELS100-24TXG switch in a dry area, with adequate air cir-

culation. Avoid placing the switch in direct sunlight or near other heat

sources, such as hot-air vents. For temperature and humidity speci-

fications, see Appendix A, “Technical Specifications.”

Ventilation

Do not restrict airflow by covering or obstructing air inlets on the side

of the switch or the rear panel internal air fan exits.

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Mounting the Switch on a Table or Shelf

Mount the switch on a table or shelf in a position which allows access to

the front panel RJ-45 ports, visibility of the port LEDs, and access to the

power cord. Make sure that the mounting surface can safely support the

switch and that there is adequate space around the switch for ventilation

and cooling.

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Mounting the Switch on a Wall

The switch ships with two (2) multi-position mounting ears and four (4)

mounting screws.

The mounting screws are used to attach the mounting ears to

the switch. Once the ears are attached to the switch, you will

need to provide appropriate screws to mount the switch to the

wall.

Figure 2-1 shows the orientation of the mounting ears for attaching the

ears to the switch for a wall mount application. Be sure that the wall

surface can safely support the switch.

Do the following:

1. Mount one of the ears to the switch using two (2) of the supplied

screws. Repeat this step for the other side of the switch.

2. Mount the switch to the wall using appropriate screws.

Figure 2-1. Mounting the Switch on a Wall

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Mounting the Switch in a Rack

The switch ships with two (2) multi-position mounting ears and four (4)

mounting screws.

The mounting screws are used to attach the mount-

ing ears to the switch. Once the ears are attached to

the switch, you will need to provide appropriate

screws to mount the switch in a rack.

Figure 2-2 shows the orientation of the mounting ears for attaching the

ears to the switch for a rack mount application. Mount the switch with the

front panel facing forward. Do the following:

1. Mount one of the ears to the switch using two (2) of the supplied

screws. Repeat this step for the other side of the switch.

2. Slide the switch into the rack and align the holes in the rack mounting

ears with the holes in the rack rails.

3. Insert and tighten appropriate rack-mounting screws (not provided).

Figure 2-2. Mounting the Switch in a Rack

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Connecting a Terminal to the Console Port

The console port is a serial RS-232 interface port that enables a

connection to a terminal for performing switch monitoring and

configuration functions. The terminal may be a PC or workstation running

terminal emulation software, or a dumb terminal configured as a Data

Terminal Equipment (DTE) connection. Alternatively, this port can be

connected to an external modem to enable remote dial-in management.

If you connect a terminal to the console port prior to powering the switch,

you can observe the progress and results of the power-up diagnostics as

the switch goes through its initialization process.

The console port connector is configured as a female null modem

connection using a female DB-9 (see Table A-1 for pinouts). A standard

straight-through wired RS-232 cable is typically all that is needed to

connect to this interface. Any cable connected to the console port must

be shielded to comply with emissions regulations and requirements.

To connect the ELS100-24TXG console port to a terminal, do the

following:

1. Connect a terminal to the console port using an interface cable

(Figure 2-3).

Figure 2-3. Connecting a Terminal to the Console Port

2. Connect the male connector of the interface cable directly to the

switch console port and tighten the captive retaining screws.

3. Connect the other end of the interface cable to a terminal (in some

instances, an adapter may be required to make this connection).

4. From your terminal, start the terminal emulation program.

5. Configure the terminal to the following communication settings: 9600

baud, no parity, 8 data bits, 1 stop bit, no hardware flow control,

ASCII character set.

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Powering the Switch

To supply power to the switch, do the following:

1. Connect the power cord to the switch and to a grounded three-prong

wall outlet (Figure 2-4). See Appendix A, “Power Cord Set

Requirements,” for more information regarding specific international

power cord requirements.

Figure 2-4. Connecting the Power Cord to the Switch

2. Turn on the power switch.

The Power LED lights green (see Figure 1-1). If it does not, check to

make sure that the power cable is plugged in correctly and that the

power source is good.

Power-Up

When you turn the power on, the switch conducts a series of hardware

and software tests to verify correct operation. If a terminal or computer is

connected to the console port, the results of the tests are displayed on the

screen. If you want to display the results of the tests after the switch has

already been turned on, turn the power switch off and then back on.

The switch performs two basic types of tests at power-up. During this

time, the Test LED (see Figure 1-1) lights steady green. These tests are:

•

Serial port

The serial console port test is the first test performed. If the switch

fails this test, no further tests are performed, and the console displays

no information.

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•

Memory

Memory tests on the CPU RAM are performed after the serial port

test. No results are displayed on the console.

After these two tests are performed, the operational software of the switch

is loaded. A series of more extensive diagnostic tests are then conducted

during which the Test LED remains lit. The results of the tests are

displayed on the terminal. If all tests pass, the Test LED turns off. When

all tests are complete, the system is functional and the user interface is

ready to receive commands at the console.

Network Cable Requirements

Copper

Table 2-1 specifies the cable types and length constraints for the various

copper interfaces on the ELS100-24TXG.

Table 2-1. Copper Cable Specifications

Interface Type

Cable Requirement

Maximum Length

10Base-T

Category 3 or 5 Unshielded Twisted

Pair (UTP)

100m (328 ft.)

100Base-TX

Category 5 UTP

100m (328 ft.)

25m (82 ft.)

1000Base-CX

150 ohm, shielded balanced

Fiber

Table 2-2 specifies the fiber types, bandwidth requirements, and length

constraints for the various Gigabit Ethernet fiber interfaces on the

ELS100-24TXG. The type of GBIC module installed determines the

interface type. The GBIC, along with the type of fiber installed, determines

the distance support.

Table 2-2. Gigabit Ethernet Fiber Specifications

Interface

Type

Fiber Type

Fiber

Diameter

(microns)

Modal

Bandwidth

(MHz * km)

Maximum

Length (m)

1000Base-SX

1000Base-LX

multi-mode

single-mode

62.5

160

200

400

500

400

500

N/A

220

275

500

550

5000

62.5

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10Base-T/100Base-TX Ports

The 10Base-T/100Base-TX ports use RJ-45 connectors. Figure 2-5

shows an RJ-45 connector being inserted into a port.

Figure 2-5. Inserting an RJ-45 Connector into a Port

The 10Base-T/100Base-TX ports interface to UTP cabling for connection

to 10Base-T or 100Base-TX network segments or end-stations. These

UTP connections meet the requirements of ISO 8877, specified by

10Base-T, Section 14 of the IEEE 802.3 specification. The ports are wired

with the MDI-X function implemented. Workstations or servers can be

connected to the ELS100-24TXG switch using standard straight-through

wired cables.

For connections to hubs or other switches, a crossover cable may be

necessary (refer to the “MDI/MDI-X Crossover Cable Wiring” section in

Appendix A). See Table A-2 for 10Base-T/100Base-TX connector pin

assignments.

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1000Base-X Gigabit Ethernet Ports

The fiber optic Gigabit Ethernet GBICs use dual SC connectors. Figure 2-

6 shows a dual SC connector being inserted into a Gigabit Ethernet port

on the ELS100-24TXG.

Figure 2-6. Inserting a Dual SC Connector into a Port

The 1000Base-X Gigabit Ethernet ports interface to different media types

depending on the GBIC module installed. The 1000Base-SX standard

over multi-mode fiber uses dual SC fiber connectors. The 1000Base-LX

standard over single mode or multi-mode fiber also uses dual SC fiber

connectors. The dual SC connectors are configured as a receive(RX)/

transmit(TX) pair with the RX connector positioned on the left side of the

port and the TX connector on the right side of the port.

Copper connections are also supported on the Gigabit Ethernet ports.

The 1000Base-CX standard over shielded, balanced copper uses High

Speed Serial Data Connectors (HSSDCs).

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3. ELS100-24TXG USER INTERFACE

Overview

When you have connected a terminal to the console port, or used Telnet

to access the switch over the network, access is gained to the console

menus. These menus allow you to reconfigure the switch from its factory

default settings, as well as to monitor switch status and performance. The

menus have a layout similar to the sample Main Menu shown in Figure 3-

1. The information is divided into the following parts:

•

Menu Identification (includes model number)

Menu Name (includes access privileges)

Selectable Items listed by letters

Screen Prompt for menu selections and entry of field parameters,

and Message Area for display of next entry option, parameters, or

error messages.

Menu ID

Cabletron Systems ELS100-24TXG

MAIN MENU

Menu name

Access Control: READ/WRITE

a. System Configuration Menu

b Switch Configuration Menu

c. Port Menu

Selectable

items

d. Switch Statistics Screen

e. General Information Screen

f. Download Software Menu

g. Save Current Configuration

h. Return to Default Configuration

i. Logout

j. Reset

Screen prompt &

message area

Enter Selection:

Figure 3-1. Sample Main Menu

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User Access

There are two modes of access to the user interface: READ-ONLY and

READ/WRITE. READ-ONLY access allows you to view switch

information, but not modify any operating parameters. READ/WRITE

access allows you to both read and modify switch information. You are

required to login with a password before obtaining READ/WRITE access.

If no password is entered (press only the [Enter] key), you are logged in

with READ-ONLY access. No password is configured in the factory

default settings, allowing full READ/WRITE access until a password is

set.

To use the console menus, do the following:

1. Type the letter associated with the desired option.

If the selected item is a submenu title, the submenu is displayed

when you enter the letter.

2. Enter the parameter requested by the screen prompt.

If the selected item is a parameter, the system displays a prompt for

the entry of a new parameter value. If the value entered is invalid, a

beep sounds, or a message displays, requesting you to enter a valid

value.

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Factory Defaults

Table 3-1 lists the factory default settings for the switch configuration

parameters. Each of these parameters can be changed via the console

menus or Telnet.

Table 3-1. Factory Default Settings

Parameter

Default Value

Active Aging Time

Auto-negotiation Enable

Broadcast Cutoff Rate

BootP/DHCP Enable

Bridge Priority

300

Yes

500000

Yes

32768

Class of Service Enable

Class of Service Port Priority

Class of Service Priority Threshold

Flow Control Enable

Forward Delay

Full Duplex

Yes

Hello Time

Max Age

Password

<none>

Path Cost

100 for 10Mbps speed ports

10 for 100Mbps speed ports

1 for 1Gbps speed ports

Port Enable

Yes

Port Priority

128

Port Speed

100 for 10/100 ports

Port Mirroring Enable

Screen Timeout

SNMP Private Community Name

SNMP Public Community Name

Spanning Tree Protocol Enable

Terminal Baud Rate

Terminal Hardware Flow Control

VLAN Enable

private

public

Yes

9600

VLAN Port Type

Access

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Menu Hierarchy

Figure 3-2 shows the ELS100-24TXG switch user interface menu

hierarchy.

SNMP Private Community Name

SNMP Public Community Name

Trap Destination #1-4

SNMP Configuration Menu

System Name

System Location

System Contact

IP Address

System

Configuration

Community Name #1-4

Subnet Mask

Display Table

Default Gateway

BootP/DHCP Enable

Screen Timeout (minutes)

Password

Make Entry Static

Add Static Entry

Delete Static Entry

Modify Static Entry

Search by Port#

Terminal Baud Rate

Search by MAC Address

Switch

Configuration

Forwarding Table Configuration Menu

Spanning Tree Configuration Menu

VLAN Configuration Menu

Class of Service Configuration Menu

Forwarding Table Aging Time (seconds)

Broadcast Cutoff Rate

Spanning Tree Protocol Enable

Port Configuration Menu

Hello Time (seconds)

Forward Delay (seconds)

Max Age (seconds)

Port ID

Port Name

Path Cost

Port Priority

Port State

Select Port

Port Mirroring Enable

Mirrored Port

Mirroring Port

Bridge Priority

VLAN Enable

VLAN Menu

VLAN Port Menu

Port Menu

Port Name

Enable Status

Link Status

Auto Negotiated Status

Full Duplex Status

Speed (10/100Mbps)

Type

VLAN Name

Ports in VLAN

VLAN Egress Ports

Configure

Class of Service Enable

Priority Threshold

Configure Port Priority

Flow Control

Configure

Port ID

Port Name

Type

Port Name

Port Enable

Flow Control Enable

Auto-negotiation Enable

Full Duplex

Switch

Statistics

Screen

Modify Port Type

Transmitted

Received

Forwarded

Filtered

Port Speed

Port ID

Port Name

Priority Default

Configure

Dropped

Errored

Switch Summary

Port Statistics

Frames Transmitted

Frames Received

Frames Forwarded

Frames Filtered

General

Information

Screen

Frames Dropped

Frames Errored

Software Version

Serial Number

Base MAC Address

Up Time (minutes)

Power Up Count

Port #n Statistics

Download Software Menu

Frames Transmitted

Frames Received

Collisions

Late Collisions

Frames Forwarded

Frames Filtered

Frames Dropped

Broadcasts Transmitted

Broadcasts Received

Multicasts Transmitted

Multicasts Received

Bytes Transmitted

CRC/Alignment Errors

Undersized Frames

Oversized Frames

Fragments

Jabbers

64 Byte Frames

65 to 127 Byte Frames

128 to 255 Byte Frames

256 to 511 Byte Frames

512 to 1023 Byte Frames

1024 to 1518 Byte Frames

Save Current Configuration

Return to Default Configuration

Logout

Reset

Bytes Received

Pause Frames Transmitted

Pause Frames Received

Figure 3-2. ELS100-24TXG User Interface Menu Hierarchy

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Main Menu

The Main Menu is the first screen seen after successfully logging in to the

system. Figure 3-3 shows the Main Menu and the accompanying table

describes the Main Menu.

MAIN MENU

Access Control: READ/WRITE

a. System Configuration Menu

b Switch Configuration Menu

c. Port Menu

d. Switch Statistics Screen

e. General Information Screen

f. Download Software Menu

g. Save Current Configuration

h. Return to Default Configuration

i. Logout

j. Reset

x. Previous Menu

Enter Selection:

Figure 3-3. Main Menu

Selection

Description

System Configura-

tion Menu

Contains commands and parameters that reflect the global con-

figuration of the switch related to management.

Switch Configura-

tion Menu

Provides access to information and parameters affecting the

function of the switch, i.e. the movement of packets through the

switch. For example, you can configure Forwarding Table,

Spanning Tree, and virtual LANs (VLANs).

Port Menu

Shows the configuration of the individual ports on the switch

and allows you to modify switch port operation.

Switch Statistics

Screen

Presents switch-level and port-level statistics.

GeneralInformation

Screen

Displays the system software version, switch serial number,

base MAC address, system up time and power-up count.

Download Software

Contains parameters and commands for initiating a software

download to upgrade the switch operating software.

Save Current

Configuration

Saves current switch operating parameters to non-volatile

memory.

Return to Default

Configuration

Restores switch operating parameters to factory defaults. You

must reset the switch for activate default parameters.

Logout

Logs out of the console interface. Once you logout, you must

enter a password before you can access the console interface

again.

Reset

Performs a software reset of the switch by restarting the system

software and reloading all operating parameters.

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System Configuration Menu

The System Configuration Menu enables modification of system-level

switch configuration parameters. Select a from the Main Menu to view the

System Configuration Menu. Figure 3-4 shows the System Configuration

Menu and the accompanying table describes the System Configuration

Menu.

SYSTEM CONFIGURATION

Access Control: READ/WRITE

a. SNMP Configuration Menu

b System Name

c. System Location

d. System Contact

e. IP Address

000.000.000.000

f. Subnet Mask

000.000.000.000

g. Default Gateway

h. BootP/DHCP Enable

i. Screen Timeout (minutes)

j. Password

k. Terminal Baud Rate

l. Terminal Hardware Flow Control

000.000.000.000

Yes

None

9600

x. Previous Menu

Enter Selection:

Figure 3-4. System Configuration Menu

Selection

Description

SNMP Configura-

tion Menu

Menu for configuring SNMP-related parameters.

System Name

System Location

System Contact

IP Address

The switch administrative name (1-36 character range).

The physical switch location (1-36 character range).

The switch contact person (1-36 character range).

The IP address of the switch.

Subnet Mask

Subnet mask associated with the switch IP address.

Default Gateway

The default gateway (or router) to which the switch sends IP

packets destined for a different subnet.

BootP/DHCP

Enable

Allows you to enable (Yes) or disable (No) the BootP and DHCP

protocols for automatically configuring the switch’s IP address

information.

Screen Timeout

(minutes)

The duration of time before a serial console or Telnet session

terminates due to user inactivity (0-65535 numeric range). A

value of “0” means that the screen will not terminate at any time.

Password

Allows “read/write” access to the user interface, via the serial

console or Telnet (1-10 character range).

Terminal Baud Rate Serial console baud rate (2400, 9600 or 19200).

Terminal Hardware

Flow Control

Allows you to enable (Yes) or disable (No) hardware flow con-

trol on serial console interface. Signals DTR, RTS and CTS are

used for this purpose. Flow control should be enabled if using

external modem.

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SNMP Configuration Menu

The SNMP Configuration Menu allows you to modify SNMP-related

configuration parameters. Select a from the System Configuration Menu

to view the SNMP Configuration Menu. Figure 3-5 shows the SNMP

Configuration Menu and accompanying table describes the SNMP

Configuration Menu.

SNMP CONFIGURATION

Access Control: READ/WRITE

private

public

000.000.000.000

public

000.000.000.000

public

000.000.000.000

public

000.000.000.000

public

a. SNMP Private Community Name

b. SNMP Public Community Name

c. Trap Destination #1

d. Community Name #1

e. Trap Destination #2

f. Community Name #2

g. Trap Destination #3

h. Community Name #3

i. Trap Destination #4

j. Community Name #4

x. Previous Menu

Enter Selection:

Figure 3-5. SNMP Configuration Menu

Selection

Description

SNMP Private

The community name for read/write SNMP access to

Community Name

the device (1-10 character range; the default name is:

“private”).

SNMP Public

Community Name

The community name for read only SNMP access to

the device (1-10 character range; the default name is:

“public”).

Trap Destination #1

Community Name #1

Trap Destination #2

Community Name #2

Trap Destination #3

Community Name #3

Trap Destination #4

Community Name #4

The IP address of trap destination #1 where SNMP

trap messages are forwarded.

The SNMP community name to use for traps forwarded

to trap destination #1.

The IP address of trap destination #2 where SNMP

trap messages are forwarded.

The SNMP community name to use for traps forwarded

to trap destination #2.

The IP address of trap destination #3 where SNMP

trap messages are forwarded.

The SNMP community name to use for traps forwarded

to trap destination #3.

The IP address of trap destination #4 where SNMP

trap messages are forwarded.

The SNMP community name to use for traps forwarded

to trap destination #4.

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Switch Configuration Menu

The Switch Configuration Menu allows you to modify switching-related

configuration parameters. Select b from the Main Menu to view the Switch

Configuration Menu. Figure 3-6 shows the Switch Configuration Menu

and the accompanying table describes the Switch Configuration Menu.

SWITCH CONFIGURATION

Access Control: READ/WRITE

a. Forwarding Table Configuration Menu

b. Spanning Tree Configuration Menu

c. VLAN Configuration Menu

d. Class of Service Configuration Menu

e. Forwarding Table Aging Time(seconds) 300

f. Broadcast Cutoff Rate

g. Port Mirroring Enable

h. Mirrored Port

500000

i. Mirroring Port

j. Transmit Data Mirror Enable

k. Receive Data Mirror Enable

Yes

x. Previous Menu

Enter Selection:

Figure 3-6. Switch Configuration Menu

Selection

Description

Forwarding Table

Menu for configuring the switch forwarding table.

Configuration Menu

Spanning Tree Configura-

tion Menu

Menu for configuring the switch Spanning Tree operation.

VLAN Configuration Menu

Menu for configuring the VLAN operation of the switch.

Menu for configuring Class of Service for the switch.

Class of Service

Configuration Menu

Forwarding Table Aging

Time

Time in seconds until entries in the forwarding table are

aged out if not accessed (10-1,000,000 second range).

Broadcast Cutoff Rate

Per second rate past which broadcast and destination un-

known unicast frames are not flooded on each group of 8

ports on the switch (100-500,000 frames per second range).

Port Mirroring Enable

Mirrored Port

Allows you to enable (Yes) or disable (No) port mirroring.

The source port for the data to be mirrored.

Mirroring Port

The destination port for the data to be mirrored.

Transmit Data Mirror

Enable *

Allows you to enable (Yes) or disable (No) the mirroring of

data transmitted out the mirrored port.

Receive Data Mirror

Enable *

Allows you to enable (Yes) or disable (No) the mirroring of

data received by the mirrored port.

* Only one of these options can be enabled at any given time. Changing the setting

of one of these options automatically changes the setting of the other option.

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Forwarding Table Configuration Menu

The Forwarding Table Configuration Menu allows you to view and modify

forwarding table parameters. The MAC address of each forwarding table

entry is displayed along with its type, disposition, and associated port

number. Select a from the Switch Configuration Menu to view the

Forwarding Table Configuration Menu. Figure 3-7 shows the Forwarding

Table Configuration Menu and the accompanying table describes the

Forwarding Table Configuration Menu.

FORWARDING TABLE CONFIGURATION

Access Control: READ/WRITE

MAC ADDRESS

TYPE

DISPOSITION

PORT ID

PORT NAME

---------------------------------------------------------------------------------------------------------------------

0a0a0a0a0a0a

0a0a0a0a0a0b

0a0a0a0a0a0c

0a0a0a0a0a0d

0a0a0a0a0a0e

0a0a0a0a0a0f

0a0a0a0a0a10

0a0a0a0a0a11

DYNAMIC

FORWARD

n. Next Page

p. Previous Page

f. First Page

l. Last Page

a. Display Table

b. Make Entry Static

c. Add Static Entry d. Delete Static Entry

e. Modify Static Entry

s. Search by Port # m. Search by MAC Address x. Previous Menu

Enter Selection:

Figure 3-7. Forwarding Table Configuration Menu

Field

Description

MAC Address

Type

MAC address for the listed port.

Displays the type of address entry: system, dynamic or static.

Disposition

Displays disposition of the address entry: local, forward or

discard.

Port ID

Displays the port number associated with the MAC address

entry.

Port Name

Selection

Displays the administrative name assigned to the port.

Description

First Page

Last Page

Displays the next page of the forwarding table.

Displays the previous page of the forwarding table.

Displays the first page (top) of the forwarding table.

Displays the last page of the forwarding table.

continued on next page

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Forwarding Table Configuration Menu (continued)

Description

Selection

Display Table

Redisplays the forwarding table.

Make Entry Static

Add Static Entry

Delete Static Entry

Modify Static Entry

Search by Port #

Makes a dynamic entry in the forwarding table static.

Adds a static entry to the forwarding table.

Deletes a static entry from the forwarding table.

Modifies a static entry from the forwarding table.

Performs a search by port number and posts the search

results at the top of the screen.

Search by MAC

Address

Performs a search by MAC Address and posts the search

results at the top of the screen.

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Spanning Tree Configuration Menu

The Spanning Tree Configuration Menu allows you to view and modify

Spanning Tree parameters. Select b from the Switch Configuration Menu

to view the Spanning Tree Configuration Menu. A letter identifies

selections that can be modified. All other fields are read-only. Figure 3-8

shows the Spanning Tree Configuration Menu and the accompanying

table describes the Spanning Tree Configuration Menu.

SPANNING TREE CONFIGURATION

Access Control: READ/WRITE

32768-000000000000

Bridge ID

Designated Root

Root Path Cost

Root Port

NO PORT

Topology Change Count

a. Spanning Tree Protocol Enable

b. Port Configuration Menu

c. Hello Time (seconds)

d. Forward Delay (seconds)

e. Max Age (seconds)

f. Bridge Priority

32768

x. Previous Menu

Enter Selection:

Figure 3-8. Spanning Tree Configuration Menu

Field

Description

Bridge ID

A unique identifier for the bridge (switch) in the Span-

ning Tree. The ID is a combination of the bridge prior-

ity and port 1 MAC address.

Designated Root

The bridge in the Spanning Tree with the lowest

Bridge ID value, designated as the root bridge.

Root Path Cost

Root Port

The cost of the path to the root bridge.

The port identifier of the port that offers the lowest cost

path to the root bridge.

Topology Change

Count

The count of the number of times the network topolo-

gy has changed from a Spanning Tree reconfigura-

tion.

continued on next page

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Spanning Tree Configuration Menu (continued)

Selection

Description

Spanning Tree Protocol

Enable

Allows you to enable (Yes) or disable (No) the

global Spanning Tree operation on the switch.

Port Configuration Menu Provides access to the Spanning Tree Port Con-

figuration Menu.

Hello Time (seconds)

The time interval between the sending of Config-

uration BPDUs by the bridge, if it is root (1-10

second range).

Forward Delay (sec-

onds)

The time interval delay before a port transfers

into the forwarding state, if it is root (4-30 second

range).

Max Age (seconds)

Bridge Priority

The maximum age of received protocol informa-

tion before it is discarded (6-40 second range).

A relative priority of bridges, with the lowest val-

ue bridge ID indicating the highest priority (0-

65535 range).

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Spanning Tree Port Configuration Menu

The Spanning Tree Port Configuration Menu allows you to view Spanning

Tree Configuration information for all of the ports in a table format. Select

b from the Spanning Tree Configuration Menu to view the Spanning Tree

Port Configuration Menu. Figure 3-9 shows the Spanning Tree Port

Configuration Menu and the accompanying table describes the Spanning

Tree Port Configuration Menu.

SPANNING TREE PORT CONFIGURATION

PORT ID PORT NAME PATH COST

Access Control: READ/WRITE

PORT PRIORITY PORT STATE

---------------------------------------------------------------------------------------------------------

128

FORWARDING

n. Next Page

a. Select Port

Enter Selection:

p. Previous Page

r. Refresh

f. First Page

x. Previous Menu

l. Last Page

Figure 3-9. Spanning Tree Port Configuration Menu

Field

Description

Port ID

A unique identifier for a port on the bridge (switch).

The administrative name assigned to the port.

Port Name

Path Cost

The contribution of the path through this port, when it is the root

port, to the total path cost from this bridge to the root bridge. 10

for 100Mbps ports, 100 for 10Mbps ports, 1 for 1Gbps ports.

Port Priority

Port State

The relative priority of the port on the bridge.

The current Spanning Tree state of the port on the bridge, either

disabled, listening, learning, forwarding, or blocking.

Selection

Description

First Page

Last Page

Select Port

Displays the next page of the table.

Displays the previous page of the table.

Displays the first page (top) of the table.

Displays the last page of the table.

Allows you to enter a port number to view and modify port param-

eters in the Spanning Tree Port #n Configuration Menu.

Refresh

Refreshes the screen to reflect latest system conditions.

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Spanning Tree Port #n Configuration Menu

The Spanning Tree Port #n Configuration Menu allows you to view

Spanning Tree Port Configuration information for an individual port.

Select a from the Spanning Tree Port Configuration Menu to view the

Spanning Tree Port #n Configuration Menu. Figure 3-10 shows the

Spanning Tree Port #n Configuration Menu and the accompanying table

describes the Spanning Tree Port #n Configuration Menu. The “Port #n”

designation represents the specific port number for configuration.

SPANNING TREE PORT #1 CONFIGURATION Access Control: READ/WRITE

Port State

DISABLED

MAC Address

000000000000

Designated Cost

Designated Port

Designated Root

Designated Bridge

a. Path Cost

b. Port Priority

32768

x. Previous Menu

Enter Selection:

Figure 3-10. Spanning Tree Port Configuration Menu

Field

Description

Port State

The current Spanning Tree state of the port, either disabled,

listening, learning, forwarding, or blocking.

MAC Address

The MAC address of the port.

Designated Cost

The cost of the path to the Root offered by the designated

port for the LAN associated with the port.

Designated Port

Designated Root

Designated Bridge

The Port ID of the port believed to be the designated port for

the LAN associated with the port.

The Bridge ID of the bridge recorded as the Root for the LAN

associated with the port.

The Bridge ID of the bridge believed to be the designated

bridge for the LAN associated with the port.

Selection

Description

Path Cost

The contribution of the path through this port, when it is the

root port, to the total path cost from this bridge to the root

bridge (1-65535 range).

Port Priority

The relative priority of the port on the bridge (0-255 range).

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VLAN Configuration Menu

The VLAN Configuration Menu allows you to configure the operation of

Virtual LANs (VLANs) in the switch. Select c from the Switch

Configuration Menu to view the VLAN Configuration Menu. Figure 3-11

shows the VLAN Configuration Menu and the accompanying table

describes the VLAN Configuration Menu. See Appendix D, “Virtual LANs

(VLANs)” for more information about this feature.

VLAN CONFIGURATION

Access Control: READ/WRITE

a. VLAN Enable

b. VLAN Menu

c. VLAN Port Menu

x. Previous Menu

Enter Selection:

Figure 3-11. VLAN Configuration Menu

Selection

Description

VLAN Enable

Allows you to enable (Yes) or disable (No) the

global VLAN operation of the switch.

VLAN Menu

Allows you to open the VLAN Menu.

VLAN Port Menu

Menu for configuring VLAN information per

port.

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VLAN Menu

The VLAN Menu displays the configuration of VLANs in the switch and

allows access to the VLAN #n Configuration Menu to create and configure

VLANs. Select b from the VLAN Configuration Menu to view the VLAN

Menu. Figure 3-12 shows the VLAN Menu and the accompanying table

describes the VLAN Menu.

VLAN MENU

Access Control: READ/WRITE

ID VLAN NAME

PORTS IN VLANVLAN EGRESS PORTS

-------------------------------------------------------------------------------------------------------

1 default 1-26 None

c. Configure d. Delete x. Previous Menu

Enter Selection:

Figure 3-12. VLAN Menu

Field

Description

The identification number of the VLAN (1-4 char-

acter range).

VLAN Name

The administrative name assigned to the VLAN

(1-14 character range; entering a VLAN name is

not required).

Ports in VLAN

The ports assigned to the VLAN.

VLAN Egress Ports

The egress (exit) ports which link the ELS100-

24TXG to other devices which also include mem-

bers of the same VLAN.

Selection

Description

Configure

Allows you to configure an existing VLAN listed in

the VLAN table, create a new VLAN (1-4094 nu-

merical range), and to open the VLAN #n Config-

uration Menu.

Delete

Allows you to delete a specific VLAN.

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VLAN #n Configuration Menu

The VLAN #n Configuration Menu allows you to configure a name for a

specific VLAN, add or remove a port in the VLAN, and add or remove an

egress port in the VLAN. Select c from the VLAN Menu to view the VLAN

#n Configuration Menu. Figure 3-13 shows the VLAN #n Configuration

Menu and the accompanying table describes the VLAN #n Configuration

Menu.

1. The designation “#n” represents the number of the

specific VLAN to be configured.

2. When configuring ports using the Ports in VLAN pa-

rameter, they will be moved to that selected VLAN, and

automatically removed from their previous VLAN.

VLAN #n CONFIGURATION

Access Control: READ/WRITE

Ports in VLAN

VLAN Egress Ports

1-26

None

a. VLAN Name

default

b. Add Port in VLAN

c. Remove Port In VLAN

d. Add VLAN Egress Port

e. Remove VLAN Egress Port

x. Previous Menu

Enter Selection:

Figure 3-13. VLAN #n Configuration Menu

Field

Description

Ports in VLAN

Lists the ports in the specific VLAN.

VLAN Egress Ports

Selection

Lists the VLAN Egress Ports for the specific VLAN.

Description

VLAN Name

Allows you to enter an administrative name for the

VLAN (1-14 character range; entering a VLAN

name is not required).

Add Port in VLAN

Allows you to enter a port in the VLAN.

Allows you to remove a port in the VLAN.

Allows you to add a VLAN Egress Port.

Allows you to remove a VLAN Egress Port.

Remove Port in VLAN

Add VLAN Egress Port

Remove VLAN Egress Port

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VLAN Port Menu

The VLAN Port Menu displays a table of VLAN configuration information

on a per port basis and allows you to modify the VLAN Port Type. Select

c from the VLAN Configuration Menu to view the VLAN Port Menu. Figure

3-14 shows the VLAN Port Menu and the accompanying table describes

the VLAN Port Menu.

VLAN PORT MENU

Access Control: READ/WRITE

PORT ID

PORT NAME

TYPE

---------------------------------------------------------------------------------------------------------

ACCESS

n. Next Page

p. Previous Page

f. First Page

l. Last Page

a. Modify Port Type

Enter Selection:

x. Previous Menu

Figure 3-14. VLAN Port Configuration Menu

Field

Description

Port ID

Port Name

Type

The number assigned to the port.

The administrative name assigned to the port

The VLAN type for each port (either Hybrid or Access).

Hybrid ports accept tagged and non-tagged frames while

Access ports only allow non-tagged frames.

Selection

Description

Displays the next page of the table.

First Page

Displays the previous page of the table.

Displays the first page of the table.

Last Page

Displays the last page of the table.

Modify Port Type

Allows you to modify the port type (either Hybrid or Access).

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Class of Service Configuration Menu

The Class of Service Configuration Menu allows you to configure Class of

Service settings for the system as well as to set the Class of Service for

VLAN tagged frames. Select d from the Switch Configuration Menu to

view the Class of Service Configuration Menu. Figure 3-15 shows the

Class of Service Configuration Menu and the accompanying table

describes the Class of Service Configuration Menu.

CLASS OF SERVICE CONFIGURATION

Access Control: READ/WRITE

a. Class of Service Enable

b. Priority Threshold

c. Configure Port Priority

x. Previous Menu

Enter Selection:

Figure 3-15. Class of Service Configuration Menu

Selection

Description

Class of Service

Enable

Allows you to enable (Yes) or disable (No) Class of

Service operation for the system.

Priority Threshold

Allows you to enter the global priority threshold level.

The configurable range is 0-7 (0=low, 7=high).

VLAN tagged frames with a priority level below this

threshold level will be assigned normal priority level

through the switch.

VLAN tagged frames with a priority level equal to or

greater than this threshold level will be assigned high

priority through the switch.

Configure Port Priority

Allows you to open the Port Priority Menu for config-

uring Class of Service information per port.

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Port Priority Menu

The Port Priority Menu allows you to modify and display a table which

shows Class of Service configuration information on a per port basis.

Select c from the Class of Service Configuration Menu to view the Port

Priority Configuration Menu. Figure 3-16 shows the Port Priority

Configuration Menu and the accompanying table describes the Port

Priority Configuration Menu.

PORT PRIORITY

Access Control: READ/WRITE

PRIORITY DEFAULT

PORT ID PORT NAME

-----------------------------------------------------------------------------------------------------------

n. Next Page

c. Configure

p. Previous Page

x. Previous Menu

f. First Page

l. Last Page

Enter Selection:

Figure 3-16. Port Priority Configuration Menu

Field

Description

Port ID

Port Name

The port number assigned to the port.

The administrative name assigned to the port (1-14

character range).

Priority Default

The priority level assigned to non-tagged frames enter-

ing the associated port. The configurable range is 0-7

(0=low, 7=high). This value, compared to the Priority

Threshold Value, determines the priority level as-

signed to all non-tagged frames.

Selection

First Page

Last Page

Configure

Description

Displays the next page of the table.

Displays the previous page of the table.

Displays the first page of the table.

Displays the last page of the table.

Allows you to configure the priority default for a specific

port (0-7 number range).

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Port Menu

The Port Menu allows you to display information for each port in a table

format, as well as to access the Port Configuration Menu. You can also

refresh the screen information. Select c from the Main Menu to view the

Port Menu. Figure 3-17 shows the Port Menu and the accompanying table

describes the Port Menu.

PORT MENU

Access Control: READ/WRITE

LINK

AUTO

FULL

PORT FLOW

ID PORT NAME ENABLED

STATUS

NEGOTIATED DUPLEX SPEED TYPE CONTROL

---------------------------------------------------------------------------------------------------------------------------------------

Yes

CONNECTED

Yes

100 100TX

n. Next Page

p. Previous Page

c. Configure

f. First Page l. Last Page

x. Previous Menu

r. Refresh

Enter Selection:

Figure 3-17. Port Menu

Field

Description

The number assigned to the port.

Port Name

Enabled

Link Status

The administrative name assigned to the port (1-14 character range).

The current “enabled” state of the port, either “Yes” or “No.”

The current link state of the port, either “Connected” or “Disconnected.”

Auto

Negotiated

The current state of auto-negotiation for the port, whether or not it has

completed auto-negotiation, either “Yes” or “No”.

Full Duplex

Speed

The current full duplex state of the port, either “Yes” or “No.”

The current speed of the port, either 10Mbps, 100Mbps, or 1000Mbps.

Type

Current connection type: 10T=10Base-T, 100T=100Base-TX,

1000SX=1000Base-SX, 1000LX=1000Base-LX, 1000CX=1000Base-CX.

Flow Control

Selection

The current enable/disable flow control port state, either “Yes” or “No.”

Description

Displays the next page of the table.

Previous Page Displays the previous page of the table.

First Page

Last Page

Refresh

Displays the first page (top) of the table.

Displays the last page of the table.

Refreshes the screen to reflect latest system conditions.

Configure

Opens up the Port Configuration Menu. From this menu you can configure

an individual port or multiple ports (See Section 4).

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Port Configuration Menu

The Port Configuration Menu allows you to configure port settings for a

specific port. Select c from the Port Menu to view the Port Configuration

Menu. Figure 3-18 shows the Port Configuration Menu and the

accompanying table describes the Port Configuration Menu.

PORTS 1-5 CONFIGURATION

Port Name

Access Control: READ/WRITE

b. Port Enable

Yes

c. Flow Control Enable

d. Auto-negotiation Enable

e. Full Duplex

Yes

100

f. Port Speed

x. Previous Menu

Enter Selection:

Figure 3-18. Port Configuration Menu

Selection

Description

Port Name

Allows you to assign an administrative name to the port

(1-14 character range).

Port Enable

Allows you to enable (Yes) or disable (No) the port(s).

Flow Control Enable

Allows you to enable (Yes) or disable (No) flow control on the

port(s).

Auto-negotiation

Enable

Allows you to enable (Yes) or disable (No) the auto-negotiation

mode for the port(s). This parameter does not appear for the

Gigabit Ethernet ports.

For 10/100 ports, if Auto-negotiation Enable is set to "No", the

Full Duplex and Port Speed fields display and are eligible for

configuration. For Gigabit Ethernet ports, if Auto-negotiation

Enable is set to "No", the Flow Control Enable field displays and

is eligible for configuration.

For 10/100 ports, if Auto-negotiation Enable is set to "Yes", the

Full Duplex and Port Speed fields disappear and the system

automatically manages these functions. For Gigabit Ethernet

ports, if Auto-negotiation Enable is set to "Yes", the Flow Con-

trol Enable field disappears and the system automatically man-

ages this function.

Full Duplex

Port Speed

Allows you to enable (Yes) or disable (No) the full duplex mode

for the port(s). This parameter cannot be changed for Gigabit

Ethernet ports which always operate in full duplex mode.

Allows you to set the operational speed for the port(s). For 10/

100 ports, this parameter can be set to either 10 or 100. This

parameter cannot be changed for Gigabit Ethernet ports and is

always set at 1000, corresponding to 1000Mbps.

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Switch Statistics Screen

The Switch Statistics Screen provides a summary display of port-level

statistics, and provides access to the Port Statistics screens. You can also

clear or refresh the statistics. Select d from the Main Menu to view the

Switch Statistics Screen. Figure 3-19 shows the Switch Statistics Screen

and the accompanying table describes the Switch Statistics Screen.

SWITCH STATISTICS

Access Control: READ/WRITE

ID TRANSMITTED RECEIVED FORWARDED FILTERED DROPPED ERRORED

---------------------------------------------------------------------------------------------------------------------------

n. Next Page

p. Previous Page

f. First Page

l. Last Page

s. Switch Summary

d. Port Statistics

x. Previous Menu

r. Refresh

c. Clear

Enter Selection:

Figure 3-19. Switch Statistics Screen

Field

Description

The number assigned to the port.

Number of frames transmitted out the port.

Number of frames received on the port.

Number of frames forwarded through the port.

Number of frames filtered on the port.

Transmitted

Received

Forwarded

Filtered

Dropped

Number of frames received on the port that were dropped by the

switch due to lack of resources.

Errored

Number of errored frames received on the port.

Description

Selection

First Page

Last Page

Switch Summary

Port Statistics

Refresh

Displays the next page of the table.

Displays the previous page of the table.

Displays the first page of the table.

Displays the last page of the table.

Allows you to open the Switch Summary Screen.

Allows you to open the Port Statistics Screen.

Refreshes switch statistics.

Clear

Clears (or sets to zero) switch statistics.

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Switch Summary Screen

The Switch Summary Screen allows you to display sum total statistics for

all ports of the switch. You can also clear or refresh the statistics. Select

s from the Switch Statistics Screen to view the Switch Summary screen.

Figure 3-20 shows the Switch Summary Screen and the accompanying

table describes the Switch Summary Screen.

SWITCH SUMMARY

Access Control: READ/WRITE

Frames Transmitted

Frames Received

Frames Forwarded

Frames Filtered

Frames Dropped

Frames Errored

r. Refresh

c. Clear

x. Previous Menu

Enter Selection:

Figure 3-20. Switch Summary Screen

Field

Description

Frames Transmit-

ted

Total number of frames transmitted out all ports.

Frames Received

Total number of frames received on all ports.

Frames Forwarded

Frames Filtered

Frames Dropped

Total number of frames forwarded through the switch.

Total number of frames filtered on all ports.

Total number of frames dropped by the switch due to lack

of resources.

Frames Errored

Selection

Refresh

Total number of errored frames received from all ports.

Description

Refreshes switch summary statistics.

Clears (or sets to zero) switch summary statistics.

Clear

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Port Statistics Screen

The Port Statistics Screen allows you to display statistics for each port on

the switch. Many of these statistics correspond to the Statistics group of

RMON. You can also refresh or clear the statistics. Select s from the

Switch Statistics Screen to view the Port Statistics screen. Figure 3-21

shows the Port Statistics Screen and the accompanying table describes

the Port Statistics Screen.

PORT 1 STATISTICS

Access Control: READ/WRITE

Collisions 0

Frames Transmitted

Frames Received

Frames Forwarded

Frames Filtered

Late Collisions

CRC/Alignment Errors

Undersized Frames

Oversized Frames

Fragments

Frames Dropped

Broadcasts Transmitted

Broadcasts Received

Multicasts Transmitted

Multicasts Received

Bytes Transmitted

Bytes Received

Pause Frames Transmitted

Pause Frames Received

Jabbers

64 Byte Frames

65 to 127 Byte Frames

128 to 255 Byte Frames

256 to 511 Byte Frames

512 to 1023 Byte Frames

1024 to 1518 Byte Frames

r. Refresh

c. Clear

x. Previous Menu

Enter Selection:

Figure 3-21. Port Statistics Screen

Description

Field

Frames Transmitted

Frames Received

Frames Forwarded

Total number of frames transmitted on the port.

Total number of frames received on the port.

Total number of frames received on the port which were

forwarded to other ports.

Frames Filtered

Frames Dropped

Total number of frames received on the port which were

filtered.

Total number of frames received on the port which were

dropped by the switch due to lack of resources.

Broadcasts Transmit-

ted

Total number of broadcast frames transmitted on the

port.

Broadcasts Received

Total number of broadcast frames received on the port.

continued on next page

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Figure 3-21 Port Statistics Screen (continued)

Description

Field

Multicasts Transmitted

Total number of multicast frames transmitted on the

port.

Multicasts Received

Total number of multicast frames received on the

port.

Bytes Transmitted

Bytes Received

Total number of bytes transmitted on the port.

Total number of bytes received on the port.

Pause Frames Transmit-

ted

Total number of flow control pause frames transmit-

ted on the port.

Pause Frames Received

Total number of flow control pause frames received

on the port.

Collisions

Total number of collisions detected on the port.

Total number of late collisions detected on the port.

Late Collisions

CRC/Alignment Errors

Total number of frames received on the port which

had either a CRC or an alignment error.

Undersized Frames

Oversized Frames

Fragments

Total number of frames received on the port which

were undersized.

Total number of frames received on the port which

were oversized.

Total number of frames received on the port which

were fragments.

Jabbers

Total number of frames received on the port which

were jabbers.

64 Byte Frames

Total number of frames received and transmitted on

the port which were 64 bytes in length.

65 to 127 Byte Frames

128 to 255 Byte Frames

256 to 511 Byte Frames

512 to 1023 Byte Frames

1024 to 1518 Byte Frames

Total number of frames received and transmitted on

the port which were from 65 to 127 bytes in length.

Total number of frames received and transmitted on

the port which were from 128 to 255 bytes in length.

Total number of frames received and transmitted on

the port which were from 256 to 511 bytes in length.

Total number of frames received and transmitted on

the port which were from 512 to 1023 bytes in length.

Total number of frames received and transmitted on

the port which were from 1024 to 1518 bytes in

length.

Selection

Refresh

Clear

Description

Refreshes port statistics.

Clears (or sets to zero) port statistics.

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General Information Screen

The General Information Screen allows you to view general system

information. Select e from the Main Menu to view the General Information

Screen. Figure 3-22 shows the General Information Screen and the

accompanying table describes the General Information Screen.

GENERAL INFORMATION

Access Control: READ/WRITE

1.00

Software Version

Serial Number

100

Base MAC Address

Up Time(minutes)

Power Up Count

00c0ba000000

x. Previous Menu

Enter Selection:

Figure 3-22. General Information Screen

Field

Description

Software Version

The version of systemsoftware currently operating

on the switch.

Serial Number

The serial number of the switch.

Base MAC Address

The base MAC address of the switch (port 1 ad-

dress).

Up Time (minutes)

Power Up Count

The number of minutes the switch has been oper-

ational since the last power cycle or reset.

The number of times the system has powered up

or been reset since the switch was originally

shipped from the factory.

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Download Software Menu

The Download Software Menu allows you to set up and initiate a software

download. Select f from the Main Menu to view the Download Software

Menu. Figure 3-23 shows the Download Software Menu and the

accompanying table describes the Download Software Menu.

DOWNLOAD SOFTWARE

Access Control: READ/WRITE

a. TFTP Server IP Address

b. TFTP File Name

1.2.3.4

c. Start TFTP Download

d. Start XMODEM Download

x. Previous Menu

Enter Selection:

Figure 3-23. Download Software Menu

Selection

Description

TFTP Server IP Address

TFTP File Name

The IP address of the TFTP server.

The file name to be downloaded from the

TFTP server (maximum of 80 characters).

Start TFTP Download

Starts a TFTP download using TFTP Server

IP Address and TFTP File Name information.

Start XMODEM Download

Starts an XMODEM (serial) download.

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Save Current Configuration

The Save Current Configuration screen ensures that all changes made to

the ELS100-24TXG switch via the console menus will be stored in the

event of power outages or power cycles.

To save your current configuration, do the following:

1. Select g from the Main Menu to view the Save Current Configuration

screen.

The following message prompt displays:

The current settings will become permanent.

All the saved settings will be lost!

a. OK

x. Cancel and return to the Previous Menu

2. Select either a to confirm the process or x to cancel the process.

Return to Default Configuration

The Return to Default Configuration screen allows you to restore the

original factory default switch settings before changes were made via the

user interface or SNMP.

To return to default configuration settings, do the following:

1. Select h from the Main Menu to view the Return to Default

Configuration screen.

The following message prompt displays:

Switch will return to default settings.

All the current changes and settings will be lost!

a. OK

x. Cancel and return to the Previous Menu

2. Select either a to confirm the process or x to cancel the process.

Logout

The Logout menu item allows you to log out of the user interface and

return to the Login screen. Select i from the Main Menu to logout. After

this command is entered, the system logout occurs automatically.

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Reset

The Reset screen allows you to perform a switch hardware reset. You are

first prompted as to whether or not to save the current switch

configuration.

To reset the switch, do the following:

1. Select j from the Main Menu to view the Reset screen.

The following message prompt displays:

Switch will go through a hardware reset.

All the current changes that have not been saved

will be lost!

a. Save changes and Reset

b. Don’t save changes and Reset

x. Cancel and return to the Previous Menu

2. Select either a or b to confirm the process or x to cancel the process.

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4. CONFIGURING & MONITORING THE SWITCH

Common Tasks

The switch console menus allow you to modify default switch settings and

configure the switch for network management. They also allow you to

monitor switch performance and status. See Section 3, “ELS100-24TXG

User Interface,” for an overview of the menu hierarchy and a description

of all menus. The following sections describe common tasks in setting up

and operating the ELS100-24TXG switch using the console menus.

To begin, set operating parameters and make sure the network

connections are correct by performing these tasks:

•

Setting password protection for the switch to prevent unauthorized

access to console menus

Assigning an IP address for the switch if you plan to manage the

switch using SNMP, or if you use Telnet to access the switch

Checking network configuration status and verifying that network

connections are correct

After the switch is installed and operating, you may want to perform any

of the following tasks:

•

Connecting via Telnet for in-band access to the console menus

Setting SNMP parameters for management access

Viewing switch statistics to monitor and evaluate switch performance

and traffic patterns on the network

•

Configuring port mirroring

Downloading a software upgrade

Configuring Spanning Tree parameters

Configuring VLANs

Configuring Class of Service

Configuring port operation (enable/disable, port speed, full/half

duplex and flow control)

•

Configuring the forwarding table

Configuring the broadcast cutoff rate

Setting a default gateway

Configuring BootP/DHCP

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Setting Password Protection

The ELS100-24TXG switch is factory-configured with access rights to the

console menus set to READ/WRITE. This setting allows anyone to use

the console menus to modify any operational parameter. To protect the

configuration of the switch from unauthorized modification, you should

enable password protection to the console menus.

To enter a password, do the following:

1. Select Password from the System Configuration Menu and press

[Enter].

2. Enter a password containing one to eight alphanumeric characters.

The password is not case sensitive. For verification, you are asked to

enter your password again. If both entries agree, the new password is

stored.

By factory default, there is no password configured. This means that at

the login:prompt, all you have to do is press [Enter] to gain READ/

WRITE access to the console menus. When you configure the password

parameter, the factory default setting is deactivated and the new

password must be used to gain READ/WRITE access to the console

menus. After a password has been configured, entering a different

password, or pressing only [Enter] at the "login:" prompt will result in

READ-ONLY access. The current access right level appears at the top of

the management screen.

If you forget your password, contact your Cabletron System Support

Representative.

You are automatically logged out from the console menus

due to inactivity based on the Screen Timeout setting in the

System Configuration Menu. A setting of “0” permits the

console menus to remain available indefinitely.

Assigning an IP Address

To assign an IP address to the switch, do the following:

1. Select System Configuration Menu from the Main menu.

2. Select IP address from the menu and enter the IP address. Press

[Enter].

The IP address is now programmed. The subnet mask is automatically set

to correspond to the class of the address entered. If a different mask is

used on the network, select Subnet Mask from the menu and enter the

appropriate mask.

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Checking Network Configuration Status

To check connection status for the network, do the following:

1. Select Port Menu from the Main Menu.

If a network cable is properly connected to a port, the Link Status for

the port reads CONNECTED. If no cable is connected to the port, or

if the cable or port is faulty, the Link Status for the port reads DIS-

CONNECTED.

2. If you see a DISCONNECTED status for a connected port, plug the

cable into another port on the switch or try another cable.

Connecting via Telnet

You can connect to the ELS100-24TXG switch from a remote location

using the Telnet application. This application allows you to establish in-

band access to the console menus.

To connect to the ELS100-24TXG switch via Telnet, do the following:

1. Assign an IP address using the System Configuration Menu.

2. Set a password using the System Configuration Menu.

3. Login to the ELS100-24TXG switch via Telnet using the configured

IP address and the password.

Setting SNMP Management Access

Access to the ELS100-24TXG switch through SNMP is controlled by

community names. The community names set for the switch must match

those used by the SNMP management station for successful

communication to occur. The switch uses two community names. The

“Public” community name allows read-only access to the device via

SNMP. The “Private” community name allows read/write access.

The ELS100-24TXG switch can send SNMP messages called traps to

SNMP management stations when an important event occurs with the

switch. The switch allows up to four destinations to be configured for

these trap messages to be sent.

To configure SNMP access for the switch, do the following:

1. Select System Configuration Menu from the Main Menu.

2. Select SNMP Configuration Menu.

3. Select SNMP Private Community Name from the menu and enter the

desired read/write access community name (you are permitted to

enter from one to 10 characters).

4. Select SNMP Public Community Name and enter the desired read-

only community name (you are permitted to enter from one to 10

characters).

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5. Select one or more Trap Destination entries from the menu and enter

the appropriate IP addresses.

6. For each trap destination entered, a corresponding community name

should be entered.

Viewing Switch Statistics

To view switch statistics, do the following:

1. Select Switch Statistics Screen from the Main Menu.

The screen lists the main statistical counts for all ports on the switch

simultaneously.

2. Select Switch Summary from the Switch Statistics Screen.

The screen lists a summary of sum total statistics for all ports on the

switch.

3. Select Port Statistics from the Switch Statistics Screen.

4. Enter the port number. Press [Enter].

The screen lists expanded port-level statistics for an individual port.

5. On any of the statistics screens, select Clear to clear (zero) the

displayed statistical counts and Refresh to refresh (update) the

displayed statistical counts.

Configuring Port Mirroring

You can mirror the traffic being switched on any 10/100 port for the

purposes of network traffic analysis and connection assurance. Port

mirroring is not supported on the Gigabit Ethernet ports. When Port

Mirroring is enabled, one port in each group of eight becomes a monitor

port for any one of the other ports within the group.

To configure port mirroring, do the following:

1. Select Switch Configuration Menu from the Main Menu.

2. Turn the switch port mirroring operation on or off by toggling the Port

Mirroring Enable option (pressing g).

3. Select Mirrored Port for the port to be mirrored (traffic information

source) and enter the number of the port. Press [Enter].

5. Select Transmit Data Mirror Enable to mirror the data being

transmitted out the mirrored port to the mirroring port. Alternatively,

select Receive Data Mirror Enable to mirror the data being received

on the mirrored port to the mirroring port. Only one of these

parameters can be enabled at a given time.

6. Connect a traffic analyzer or RMON probe to the mirroring port.

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Downloading a Software Upgrade

You can upgrade the operational software in the ELS100-24TXG switch

without physically opening the switch or being in the same location. The

software storage sector in the flash memory of the switch is

reprogrammable, allowing you to easily download software feature

enhancements and problem fixes to the switch from a local or remote

location.

Software can be downloaded to the switch in two ways:

•

Via the serial port. This procedure is an out-of-band operation that

copies the software through the serial port to the switch. This

operation takes approximately 10 minutes and requires minimal

configuration.

•

Via TFTP download. This procedure uses a TFTP server connected

to the network and downloads the software using the TFTP protocol.

A TFTP download is much faster than a serial download, requiring

only a few seconds, and can be used to upgrade an ELS100-24TXG

switch that is not physically proximate. The disadvantage is that this

method requires a TFTP server and additional setup.

Downloading Via the Serial Port

A serial download is the easiest method to upgrade the ELS100-24TXG

switch software, requiring the least amount of equipment and

configuration.

To download switch software via the serial port, do the following:

1. Select Download Software Menu from the Main Menu.

2. Select Start XMODEM Download.

The following message prompt displays:

Software downloader is running.

Software downloader request: Please start XMODEM

transfer (9600, N, 1). (Please ignore any

characters that may appear on the next line).

3. Send the file using the XMODEM protocol from your computer

application (the procedure varies depending upon the application

used).

When the XMODEM procedure finishes, the following message

prompt displays:

Software download successfully completed XMODEM

download. Please wait while program flash is being

written. Software downloader is exiting after

successful download to flash. Please wait while

system initializes.

The system software will reinitialize and display the login prompt.

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Downloading Via TFTP

To perform a TFTP download, you must first configure the ELS100-

24TXG switch. This consists of programming the switch with an IP

address, if this has not already been done, and entering the IP address of

the TFTP server and the name of the upgrade file. To program the switch

IP address, go to the System Configuration Menu which is accessible

from the Main Menu screen.

To download switch software via TFTP, do the following:

1. Select TFTP Server IP Address from the Download Software Menu.

2. Enter the TFTP server IP address and press [Enter].

3. Select TFTP File Name and enter the file name to be downloaded

from the TFTP server.

For a TFTP download, the path to the file must be in-

cluded in its name. For example, if the upgrade file

name is filename.bin and it resides in the directory /

usr/tftp on the TFTP server, then you must enter the

TFTP file name as: “/usr/tftp/filename.bin”.

4. If necessary, configure the address of an IP gateway to reach the

server from the switch using the Default Gateway field on the System

Configuration Menu.

5. Configure the TFTP server by copying the download file to the

appropriate directory and starting the server.

6. Select Start TFTP Download and press [Enter].

To verify that the TFTP download has been successfully completed,

note the software version level displayed on the General Information

screen accessible from the Main Menu. This number should match

the version number of the downloaded file.

Configuring Spanning Tree Parameters

The ELS100-24TXG switch supports the IEEE 802.1D Spanning Tree

Protocol. This protocol allows redundant connections to be created

between LAN segments for purposes of fault tolerance. Two or more

physical paths between different segments can be created through the

switch, with the Spanning Tree Protocol choosing a single path at any

given time and disabling all others.

If the chosen path fails for any reason, a disabled alternative is activated,

thereby maintaining the connection. See Appendix B, “Spanning Tree

Concepts,” for further information on using the Spanning Tree Protocol in

a network.

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To configure Spanning Tree Parameters, do the following:

Configuring Spanning Tree parameters from their de-

fault can cause serious deterioration of network per-

formance.

1. Select Switch Configuration Menu from the Main Menu.

2. Select Spanning Tree Configuration Menu.

3. Turn the switch Spanning Tree operation on or off by toggling the

Spanning Tree Protocol Enable option by pressing a.

4. Change the main Spanning Tree operational parameters as desired.

The parameters on this screen affect the operation of Spanning Tree

on the switch as a whole.

5. Select Port Configuration.

The Spanning Tree Port Configuration Menu displays. Change the

parameters that display in this menu as required.

Configuring VLANs

A virtual LAN (VLAN) is a group of network devices on one or more

network segments configured such that they can communicate as if they

are on the same LAN. VLANs are based on logical instead of physical

connections and so enable greater flexibility in network design.

The most fundamental benefit of VLANs is the ability to create

workgroups of users based on function rather than on physical location or

media. For further information, see Appendix D, “Virtual LANs (VLANs).”

To configure VLANs, do the following:

1. Select Switch Configuration Menu from the Main Menu.

2. Select VLAN Configuration Menu.

3. Turn the global switch VLAN operation on or off by toggling the VLAN

Enable option by pressing a.

4. Select VLAN Menu.

The VLAN Menu displays. This menu displays the current configura-

tion of VLANs in the system.

5. To delete a current VLAN, select Delete, then enter the number of the

VLAN.

6. To configure a VLAN, select Configure and enter a VLAN number. A

new VLAN can be created this way.

The VLAN #n Configuration Menu displays. From this menu, you can

configure VLAN names, add/delete ports in a VLAN, and add/delete

egress ports for a VLAN.

7. From the main VLAN Configuration Menu, select VLAN Port Menu to

configure the VLAN port mode (hybrid or access) for individual ports.

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Configuring Class of Service

You can configure Class of Service parameters using the Class of Service

Configuration Menu. This menu permits you to configure priority levels to

traffic being forwarded through the switch. During periods of congestion,

Class of Service settings ensure that traffic which has been assigned high

priority is forwarded through the switch ahead of normal priority traffic. For

further information, see Appendix E, “Class of Service.”

To configure Class of Service, do the following:

1. Select Class of Service Configuration Menu from the Switch

Configuration Menu.

2. Turn the global switch Class of Service operation on or off by toggling

the Class of Service Enable option by pressing a.

3. Select Priority Threshold and enter a number between 0 and 7. This

number represents the threshold between high and low priority traffic

passing through the switch.

4. Select Configure Port Priority.

The Port Priority Menu displays. From this menu, individual port pri-

ority levels can be configured.

Configuring Port Operation

You can configure 10/100 ports for operational parameters such as auto-

negotiation, duplex mode, port speed and flow control. On the Gigabit

Ethernet ports, flow control and auto-negotiation can be configured, but

duplex mode and port speed cannot. The Gigabit Ethernet ports always

operate in full duplex mode and at a 1000Mbps speed.

To configure port operation, do the following:

1. Select Port Menu from the Main Menu.

2. Select Configure and enter an individual port number or multiple port

numbers. Press [Enter].

Examples: You can configure an individual port or

multiple ports, separated by commas or hyphens, in ei-

ther:

a list: ports 1, 3, 5, 7

a range: ports 6-9

or a combination of both: 1, 3, 5, 7, 10-15, 21, 23

The port number(s) entered displays on the top of the Port Configu-

ration screen.

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3. Select Port Name and enter a Port Name. Press [Enter].

4. Select Port Enable to toggle between enabling (Yes) and disabling

(No) the port(s).

5. Select Flow Control Enable to toggle between enabling (Yes) or

disabling (No) flow control on the port(s).

6. Select Auto-negotiation Enable to toggle between enabling (Yes) or

disabling (No) auto-negotiation on the port.

For 10/100 ports, if Auto-negotiation Enable is set to

"No", the Full Duplex and Port Speed parameters can

be configured. For Gigabit Ethernet ports, if Auto-ne-

gotiation Enable is set to "No", the Flow Control En-

able parameter can be configured.

For 10/100 ports, if Auto-negotiation Enable is set to

"Yes", the Full Duplex and Port Speed fields disappear

and the system automatically configures these func-

tions. For Gigabit Ethernet ports, if Auto-negotiation

Enable is set to "Yes", the Flow Control Enable field

disappears and the system automatically configures

this function.

7. Select Full Duplex to toggle between Yes (Full Duplex) and No (Half

Duplex) mode on the port(s).

8. Select Port Speed to toggle between 10Mbps and 100Mbps speeds

on the port(s).

Configuring the Forwarding Table

The Forwarding Table allows you to designate forwarding treatment

through the switch for specific MAC addresses, allowing you to maintain

the efficiency and security of your network. You can search for specific

MAC addresses by the address itself or by port number. The switch learns

addresses dynamically from incoming packets and builds a table of these

addresses along with their associated ports. There are three types of

MAC addresses in the forwarding table:

•

Dynamic MAC addresses, which are dynamically learned by the

switch and removed automatically from the forwarding table. These

addresses are removed due to non-use based on the time period

defined by the Forwarding Table Aging Time parameter in the Switch

Configuration Menu.

•

Static MAC addresses, which are entered manually, stored in

nonvolatile memory and automatically placed in the forwarding table.

System MAC addresses, which are set by the system software and

cannot be modified. Each switch port has a permanent system MAC

address assigned to it.

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There are three types of dispositions associated with each address in the

forwarding table:

•

Forward, which directs packets destined for a specific MAC address

to a specific port.

Discard, which drops packets destined for a specific MAC address

(and thus provides a security function by blocking certain packets).

Local, which is for packets destined for the switch itself (such as a

“local” SNMP management packet).

To configure the forwarding table, do the following:

1. Select Switch Configuration Menu from the Main Menu.

2. Select Forwarding Table Configuration Menu.

To either make an existing dynamic entry static (Make Entry Static) or

delete a static entry (Delete Static Entry), do the following:

1. Select the letter associated with the option.

The following message prompt displays:

Enter MAC Address:

2. Enter the MAC address. Press [Enter].

To either add a static entry (Add Static Entry) or modify a static entry

(Modify Static Entry), do the following:

1. Select the letter associated with the option.

The following message prompt displays:

Enter MAC Address:

2. Enter the MAC address. Press [Enter].

The following message prompt displays:

Forward to Port (Y/N):

3. Do one of the following:

If you select “Y” and Press [Enter], the system displays:

Enter Port Number (1-26):

Enter the port number. Press [Enter].

If you select “N” and press [Enter], the system displays “discard” in

the Disposition field.

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Configuring Broadcast Cutoff Rate

This setting affects the throttling of excessive broadcast or unicast

packets with unknown MAC addresses being handled by the switch.

Normally, when these types of packets are received by the switch, they

are forwarded (flooded) to every port on the switch or on a VLAN.

However, if the receiving rate of these packets exceeds the broadcast

cutoff rate, the switch will throttle back or limit the forwarding of these

packets based on the configured Broadcast Cutoff Rate. This mechanism

helps to prevent broadcast storms, a problem often encountered in

Ethernet networks.

To configure the broadcast cutoff rate, do the following:

1. Select Switch Configuration Menu from the Main Menu.

2. Select Broadcast Cutoff Rate, enter the rate value, and press [Enter].

Valid values are in the range from 100 to 500,000 per second. This

rate value is applied to each grouping of 8 10/100 ports and each Gi-

gabit Ethernet port on the switch. A setting of 500,000 essentially dis-

ables this feature.

Setting a Default Gateway

The Default Gateway parameter defines the IP address of a router or

other network device to which IP packets are to be sent if destined for a

subnet outside of that which the switch is operating.

To set a default gateway, do the following:

1. Select System Configuration Menu from the Main Menu.

2. Select Default Gateway.

3. Enter the gateway IP address. Press [Enter].

Configuring BootP/DHCP

The DHCP and BootP protocols allow you to automatically configure the

switch’s IP address information. Enabling this feature greatly speeds up

device configuration, especially when a large number of devices are

installed.

A DHCP and/or BootP server must be operating on the network and be

properly configured for this option to work. When this option is enabled,

the switch first tries to obtain an IP address from a DHCP server. If this

fails, the switch tries to obtain an IP address from a BootP server. If this

fails, the switch uses a previously configured IP address, if one exists.

To configure BootP/DHCP, do the following:

1. Select System Configuration Menu from the Main Menu.

2. Select BootP/DHCP Enable.

This selection toggles between Enable and Disable.

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5. SNMP MANAGEMENT

The SNMP Protocol

SNMP (Simple Network Management Protocol) is a communication

protocol designed specifically for the purpose of managing devices or

other elements on a network. Network equipment commonly managed

with SNMP includes hubs, switches, routers, and host computers. SNMP

is typically used to configure these types of devices for proper operation

in their network environment, as well as to monitor them to evaluate their

performance and detect potential problems.

Managed entities supporting SNMP typically contain software, which runs

locally on the device and is referred to as an agent. In Figure 5-1, software

in an ELS100-24TXG switch functions as an agent, monitoring and

controlling the functionality of the switch.

Figure 5-1. ELS100-24TXG Switches Managed by an

SNMP Management Workstation

A defined set of variables, referred to as managed objects, is maintained

by the agent and used to manage the device. These objects are defined

in a Management Information Base (MIB) which allows for a standard

presentation of the information controlled by the agent over the network.

The software used to access the information maintained by the SNMP

agents across a network is referred to as the SNMP Manager, and

typically runs on a workstation.

The SNMP manager software uses a MIB specification, equivalent to that

which the agent maintains, to read and write objects controlled by the

agent for purposes of configuring and monitoring the device. SNMP

defines the format of the MIB specifications and the protocol used to

access this information.

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There are three main operations defined in SNMP:

•

Operations that read information from the managed device, such as

those used to obtain status or statistical data, are called GET

operations.

•

Operations that change a functional parameter on the device, such

as those used to configure Spanning Tree or to initiate a software

download, are referred to as SET operations. GET and SET

operations are initiated only by the manager software, and result in a

response by the agent.

•

The third operation type, the TRAP, allows the agent to send an

unsolicited message to the manager. This operation is typically used

as an alert of a potential problem or a change of status with the

device. The Trap Destination parameter in the SNMP Configuration

Menu is used to configure the IP addresses of the SNMP Manager to

which ELS100-24TXG trap messages are sent.

MIB Objects

A number of standard MIB specifications have been defined for managing

network equipment. SNMP compliant devices typically support one or

more standard MIBs defined by the Internet Engineering Task Force

(IETF), in the form of Request for Comments (RFC) documents.

These MIBs provide a common method of managing devices, such as

switches and hubs, and network interfaces, such as Ethernet and token

ring. The primary standard MIB, referred to as MIB-II, provides an overall

view of the managed agent and must be supported, at least in part, by all

SNMP agents. In addition, proprietary MIB extensions are defined by

commercial vendors for managing device-specific functions of their

products.

The ELS100-24TXG switch supports four standard MIBs:

•

RFC 1213 - Management Information Base for Network

Management of TCP/IP based Internets (MIB-II)

RFC 1398 - Definitions of Managed Objects for the Ethernet-like

Interface Types (Ethernet MIB)

•

RFC 1493 - Definitions of Managed Objects for Bridges

RFC 1757 - Remote Network Monitoring Management Information

Base

The ELS100-24TXG switch also supports Cabletron proprietary MIB

extensions.

RFC 1213 (MIB-II)

RFC 1213 provides management of switch system-level parameters,

including TCP/IP protocol-related statistics, IP addressing, routing table

information, and interface statistics for each switch port. MIB-II is the

standard MIB defined by RFC 1213. All agent devices operating SNMP

are required to support at least part of MIB-II.

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This MIB reports information about the protocols and network interfaces

supported on the agent itself, as well as other general information. The

MIB is divided into a number of groups, each of which corresponds to a

specific protocol or set of information. Some groups are defined in other

RFC documents.

The groups specifically defined in RFC 1213 and supported by the

ELS100-24TXG switch system software are as follows:

•

System – General information about the agent system

Interfaces – Information about the network interfaces of the system

Address Translation – Interface address information, both MAC level

and network (IP) level

•

IP – Statistics and information related to the IP protocol

ICMP – Statistics and information related to the ICMP protocol

TCP – Statistics and information related to the TCP protocol

UDP – Statistics and information related to the UDP protocol

Transmission – Statistics and information related to the physical

network medium to which the system interfaces (e.g. Ethernet, token

ring, etc.).

•

SNMP – Statistics and information related to the SNMP protocol

RFC 1398 (Ethernet MIB)

RFC 1398 provides management and monitoring for the Ethernet-specific

aspects of each port on the switch. This is the Ethernet-specific statistics

subgroup of the MIB-II Transmission group. This group provides a set of

statistics related to Ethernet’s physical level operation. Specifically, error

and collision-related statistics are presented.

RFC 1493 (Bridge MIB)

RFC 1493 is a group defined under MIB-II. This MIB deals with the

operation of the system as an 802.1D-compliant bridge. Areas of

functionality supported by this group include Spanning Tree and

forwarding table information and configuration.

RFC 1757 (RMON MIB)

RFC 1757 is a group defined under MIB-II. This MIB provides

management for the RMON aspects of the switch. The ELS100-24TXG

switch supports four of the nine groups of RMON defined for Ethernet

networks on a per port basis. For further information, see the subsection

“RMON” in Chapter 1.

Cabletron Proprietary MIB Extensions

Areas of ELS100-24TXG switch functionality not covered by the standard

RFC MIBs are specified in the Cabletron private MIB. This MIB definition

is specified separately from MIB-II. Areas covered in this MIB include

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various system, switch, and port level information. System information

MIB variables are shown in Table 5-1, switch information variables in

Table 5-2, and port variables in Table 5-3.

Table 5-1. System Information Variables

Variable

Description

SerialNo

Serial number of the unit.

TftpIpAddress

TftpFilename

PowerUpCount

TFTP server IP address for TFTP downloads.

Filename of the download upgrade file on the TFTP server.

Cumulative number of times switch has powered up or

been reset.

BroadcastCutoffRate

Per second rate past which broadcast and destination un-

known unicast frames are not flooded on each group of 8

10/100 ports and each Gigabit Ethernet port on the switch.

GatewayIPAddress

TftpStartDownload

IP address of the default gateway (router) to which packets

destined for another subnet are sent.

Start TFTP downloads via SNMP, using TftpIpAddress and

TftpFilename.

BootpDhcpEnable

Reset

Enable/disable BootP/DHCP for IP address configuration.

Remotely execute a software reset of the switch.

Table 5-2. Switch Information Variables

Variable

Description

SwitchIpAddress

SwitchSubnetMask

ActiveAgingTime

IP address of the switch, used for management.

Subnet mask corresponding to the SwitchIPAddress.

Aging tick period in seconds by which addresses in the for-

warding table are aged out.

SwitchStpStatus

SwitchManager

SwitchTrapRcvr1

Enable/disable operation of Spanning Tree on the switch.

List of SNMP trap manager IP addresses.

SNMP trap manager IP address #1.

SwitchTrapCommunity1

SNMP community associated with trap manager

IPaddress #1.

SwitchTrapRcvr2

SNMP trap manager IP address #2.

SwitchTrapCommunity2

SNMP community associated with trap manager

IP address #2.

SwitchTrapRcvr3

SNMP trap manager IP address #3.

SwitchTrapCommunity3

SNMP community associated with trap manager

IP address #3.

SwitchTrapRcvr4

SNMP trap manager IP address #4.

SwitchTrapCommunity4

SNMP community associated with trap manager

IP address #4.

SwitchPortMirroring Status

Enable/disable port mirroring operation of the switch.

continued on next page

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Table 5-2 Switch Information Variables (continued)

Description

Variable

SwitchMirroredPort

SwitchMirroringPort

SwitchXmitMirrorEnable

Port to be mirrored from.

Port to be mirroring to.

Enable/disable mirroring of transmitted traffic out of the

mirrored port to the mirroring port.

SwitchRcvMirrorEnable

Enable/disable mirroring of received traffic into the mir-

rored port to the mirroring port.

SwitchVlanEnable

SwitchVlanConfigTable

SwitchVlanId

Enable/disable global VLAN operation of switch.

Table indexed by SwitchVlanId

VLAN number or ID.

SwitchVlanName

SwitchVlanPorts

SwitchVlanStatus

Text string for VLAN name.

Ports in the VLAN.

Variable used to add or delete entries from the VlanCon-

figTable.

SwitchVlanEgressPorts

SwitchVlanStatus

Ports to which traffic destined for this VLAN may be

transmitted.

Variable used to add or delete entries from the Vlan

ConfigTable.

SwitchVlanPortTable

SwitchVlanPortId

SwitchVlanPvid

Table indexed by SwitchVlanPortId.

Port number or ID.

Port VLAN ID (PVID) for this port.

SwitchVlanPortType

The type of VLAN this port is operating as, either hybrid

or access.

SwitchPriorityEnable

Enable/disable global traffic priority in the switch.

SwitchPriorityThreshold

Priority threshold level (0-7) in the switch which defines

switch traffic to be high or low priority.

SwitchPriorityPortTable

SwitchPriorityPortId

SwitchPriorityDefault

Priority table indexed by SwitchPriorityPortId.

Port number or ID.

Priority level (0-7) assigned to untagged traffic entering

the associated port.

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Table 5-3. Port Variables

Variable

Description

PortId

Port number or ID.

Link status of the port.

PortStatus

PortDuplexStatus

Full/half duplex setting of the port. Not configurable

if auto-negotiation is enabled.

PortName

PortEnable

PortSpeed

Text name assigned to the port.

Enable/disable status of the port.

Speed the port is operating at. Not configurable if

auto-negotiation is enabled.

PortAutonegEnable

PortFlowControlEnable

PortType

Enable/disable auto-negotiation on the port.

Enable/disable flow control on the port.

The type of port, either: 10Base-T, 100Base-TX,

1000Base-SX, 1000Base-LX, or 1000Base-CX.

Compiling MIB Extensions: Cabletron Website

The MIBs supported by the ELS100-24TXG switch must be compiled into

the SNMP network management platform before the switch can be

managed. The supported MIBs are available using Cabletron’s website

at:

http://www.cabletron.com

The four standard MIB specifications listed above with which the

ELS100-24TXG switch is compliant are generally available with the

SNMP management platform.

Application modules specific to managing the ELS100-24TXG switch

under different network management platforms are available. Contact

Cabletron Systems for information regarding supported platforms.

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APPENDIX A. TECHNICAL SPECIFICATIONS

General

Standards Compliance

IEEE 802.1D Transparent Bridging Specifications (ISO/IEC 10038)

IEEE 802.1p Traffic Class Expediting and Dynamic Multicast Filtering

IEEE 802.1Q Virtual Bridged Local Area Networks

IEEE 802.2 Local Area Networks, Logical Link Control (LLC)

IEEE 802.3 CSMA/CD 9 (ISO/IEC 8802-3)

IEEE 802.3i 10Base-T (ISO/IEC 8802-3, clause 14)

IEEE 802.3u 100Base-TX (ISO/IEC 8802-3, clause 25)

IEEE 802.3x Flow Control

IEEE 802.3z Gigabit Ethernet

EIA RS-232C (DTE-to-DCE)

EIA RS-310C (19” rackmount)

Certification

Emissions: FCC Part 15, Subpart B, Class A; EN55022 (CISPR 22),

Class A; VCCI

Safety: UL 1950; cUL 1950 (CSA); IEC 950 (TUV)

CE Directives: 89/336/EEC; 93/68/EEC; 73/23/EEC

Data Rate

10 Mbps Manchester encoded, 100 Mbps 4B/5B encoded, or 1 Gbps 8B/

10B encoded.

Environmental Specifications

Operating temperature:

Operating humidity:

Storage temperature:

Storage humidity:

32° to 113° F ( 0° C to 45° C)

5 to 95% relative, non-condensing

-22° to 158°F (-30° C to 70° C)

5 to 95% relative, non-condensing

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Electrical Specifications

Input voltage:

100-240 VAC

50-60 Hz

75 VA

Input frequency:

Maximum power consumption:

Physical

Height:

Length:

1.75 in. (4.4 cm)

16.0 in. (40.6 cm)

Width:

17.1 in. (43.4 cm mountable in a

standard 19 in. rack)

Weight:

10.5 lb. (4.8 kg)

Microprocessor

Type:

Intel i960J series, 32 bit

33 MHz

Speed:

Memory

Processor DRAM:

4 MB

Packet Buffer Memory:

4 MB per 8 10/100 ports

8 MB per 1 Gigabit Ethernet port

Flash Memory:

2 MB

72 Technical Specifications

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Port Specifications

Console Port

Table A-1 shows the console port pin assignments.

Table A-1. RS-232 Console Port Pin Assignments

Signal Name

RTS/CTS

TXD

RXD

DSR

Ground

DTR

DCD

Not used

10Base-T and 100Base-TX Ports

Table A-2 shows the 10Base-T/100Base-TX pinouts. These ports are

wired MDI-X. All undefined pins are not used.

Table A-2. 10Base-T/100Base-TX Pinouts

MDI-X Signal Name

RD+

RD-

TD+

TD-

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MDI/MDI-X Crossover Cable Wiring

Figure A-1 shows the wiring scheme for implementing a crossover cable

if needed for connection to the switch’s 10Base-T or 100Base-TX ports.

Such a cable may be required when connecting the switch to another

switch or a hub device.

Figure A-1. External Crossover Cable Wiring

Power Cord Set Requirements

The wide-range input feature of the ELS100-24TXG Ethernet switch

permits it to operate from any line voltage between 100 and 240 VAC.

The power cord set (appliance coupler, flexible cord, and wall plug) you

received with the switch meets the requirements for use in the country

where you purchased the switch.

Power cord sets for use in other countries must meet the requirements of

the country where you use the switch. For more information on power

cord set requirements, contact your Cabletron System Support

Representative.

General Requirements

The requirements listed below are applicable to all countries:

•

The length of the power cord set must be at least 5.00 feet (1.5 m)

and a maximum of 6.56 feet (2.0 m).

•

All power cord sets must be approved by an acceptable accredited

agency responsible for evaluation in the country where the power

cord set will be used.

•

The power cord set must have a minimum current capacity of 10A

and a nominal voltage rating of 125 or 250 VAC, as required by each

country’s power system.

The appliance coupler must meet the mechanical configuration of an

EN 60 320/IEC 320 Standard Sheet C13 connector for mating with

appliance inlet on the switch.

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Country-Specific Requirements

Table A-3 lists the power cord set requirements by country and identifies

the accredited agency within that country.

Table A-3. Power Cord Set Requirements by Country

Country

Australia

Austria

Accredited Agency

EANSW

OVE

See Notes *

Belgium

CEBC

CSA

Canada

Denmark

Finland

DEMKO

FIMKO

UTE

France

Germany

Italy

VDE

IMQ

Japan

JIS

Netherlands

Norway

KEMA

NEMKO

SEMKO

SEV

Sweden

Switzerland

United Kingdom

United States

BSI

* The note column includes a number. Associate this num-

ber with the corresponding notes listed after the table to ob-

tain specific power standards and requirements.

Note 1

Flexible cord must be <HAR> Type HO5VV-F or HO3VV-F, 3-conductor,

1.0 mm2, or 0.75 mm2 conductor size. Power cord set fittings (appliance

coupler and wall plug) must bear the certification mark of the agency

responsible for evaluation in the country where it will be used.

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Note 2

Flexible cord must be Type SV, SJ, SPT or equivalent, No. 18 AWG, 3-

conductor. Wall plug must be a two-pole grounding type with a NEMA 5-

15P (15A, 125V) or NEMA 6-15P (15A 250V) configuration.

Note 3

Appliance coupler, flexible cord, and wall plug must bear a "T" mark and

registration number in accordance with the Japanese Dentori Law.

Flexible cord must be Type VCT or VCTF, 3-conductor, 0.75mm2

conductor size. Wall plug must be a two-pole grounding type with a

Japanese Industrial Standard C8303 (15A, 125V) configuration.

76 Technical Specifications

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APPENDIX B. SPANNING TREE CONCEPTS

General

The IEEE 802.1D Spanning Tree Protocol resolves the problems of

physical loops in a network by establishing one primary path between any

two switches in a network. Any duplicate paths are barred from use and

become standby or blocked paths until the original path fails, at which

point they can be brought into service.

Spanning Tree Features

The ELS100-24TXG switch meets the requirements of the Spanning Tree

Protocol (STP) by performing the following functions:

•

Creates a single spanning tree from any arrangement of switching or

bridging elements.

The term “switch” is used as an equivalent to

“bridge” in this document.

•

Compensates automatically for the failure, removal, or addition of

any device in an active data path.

Achieves port changes in short time intervals, which establishes a

stable active topology quickly with a minimum of network

disturbance.

•

Uses a minimum amount of communications bandwidth to

accomplish the operation of the Spanning Tree Protocol.

Reconfigures the active topology in a manner that is transparent to

stations transmitting and receiving data packets.

Manages the topology in a consistent and reproducible manner

through the use of Spanning Tree Protocol parameters.

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Spanning Tree Protocol in a Network

Figure B-1 illustrates the use of three ELS100-24TXG switches to

establish an effective Spanning Tree configuration. Switches A, B and C

are connected together in a redundant topology (more than one path

between two points). If the connection between A and B goes down, the

link between A and C becomes active, thereby establishing a path

between A and B through switch C. Additionally, if the connection

between B and C goes down, the link between A and C becomes active,

establishing a path between B and C through switch A.

Figure B-1. Spanning Tree Using ELS100-24TXG Switches

Spanning Tree Protocol Parameters

Several configuration parameters control the operation of the Spanning

Tree Protocol. Table B-1 describes the parameters and lists the ELS100-

24TXG switch default settings for each parameter.

You can cause serious network performance degradation

if you do not fully understand Spanning Tree concepts.

Be sure to consult personnel experienced with this pro-

cess prior to configuring Spanning Tree parameters.

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Table B-1. Spanning Tree Protocol Defaults

Description

Parameter

Default Value

Bridge

Group

Unique MAC group address, recognized by all bridges

in the network.

Address

Bridge

Identifier

Identifier for each bridge. This parameter consists of

two parts: a 16-bit bridge priority and a 48-bit network

adapter address. Ports are numbered in absolute

numbers starting from 1 regardless of their bridge

attachment. The network adapter address is the same

address as the first port of the bridge.

32768 (bridge

priority)

Port

Identifier

Identifies each port of each bridge, with an incremen-

tal default value given for each port.

Port 1 -32768

Port 2 -32769

Port 3 -32770

Port 4 -32771

Port 5 -32772

Port 6 -32773

Port 7 -32774

Port 8 -32775

Port 9 -32776

Port 10 -32777

Port 11 -32778

Port 12 -32779

Port 13 -32780

Port 14 -32781

Port 15 -32782

Port 16 -32783

Port 17 -32784

Port 18 -32785

Port 19 -32786

Port 20 -32787

Port 21 -32788

Port 22 -32789

Port 23 -32790

Port 24 -32791

Port 25 -32792

Port 26 -32793

Port Priority

Indicates the priority of a specific port in relation to

other ports.

128

Cost Compo-

nent of Each

Port

The Spanning Tree Protocol calculates and ensures

that an active topology generates minimal cost paths.

A value of 100 is generally used for 10Mbps Ethernet

networks, a value of 10 is for 100Mbps Ethernet

networks, and a value of 1 is for 1Gbps Ethernet

networks.

For detailed information on the operation of the Spanning Tree Protocol,

consult Section 4 of IEEE Standard 802.1D, ISO/IEC 10038:1993.

Spanning Tree Protocol Operation

When the Spanning Tree Protocol is enabled for the first time or when

there is a change in the network topology, such as a failure or the addition

or removal of a component, the Spanning Tree Protocol automatically

sets up the active topology of the current network.

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Communicating Between Bridges

Periodically, all devices running the Spanning Tree Protocol on a network

transmit packets to each other “in care of” the Bridge Group Address

which all bridges share. When a bridge receives a frame sent to the

Bridge Group Address, the bridge’s Spanning Tree Protocol processes

the packet. Application software and other LAN segments ignore the

packet. Bridges communicate between each other in order to determine

the Root Bridge.

Selecting a Root Bridge and Designated Bridges

During communication between bridges, one bridge is determined to

have the lowest bridge identifier. This bridge becomes the Root Bridge.

After the Root Bridge has been selected, each LAN segment looks for the

bridge that has the lowest cost relative to the Root Bridge. These bridges

become Designated Bridges.

Selecting Designated Ports

Each Designated Bridge selects a Designated Port. This port is

responsible for forwarding packets to the Root Bridge.

Handling Duplicate Paths

When the active topology of the network is determined, all packets

between any two nodes in the network use only one path. Where a

duplicate path exists, the non-designated port is put into a blocking state.

Remapping Network Topology

If there is a change in the network topology due to a failure or the removal

or addition of any active components, the active topology also changes.

This may trigger a change in the state of some blocked ports.

There are five (5) states that the ports can be in for spanning tree:

•

Blocking: A port in this state does not participate in the transmission

of frames, thus preventing duplication arising through multiple paths

existing in the active topology of the bridged LAN.

•

Listening: A port in this state is preparing to participate in the

transmission of frames. The transmission of frames is temporarily

disabled in order to prevent temporary loops, which may occur in a

bridged LAN during the lifetime of this state as the active topology of

the bridged LAN changes.

•

Learning: A port in this state is preparing to participate in the

transmission of frames.

Forwarding: A port in this state is participating in the transmission of

frames.

Disabled: A port in this state does not participate in the transmission

of frames or the operation of the spanning tree process.

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APPENDIX C. FLOW CONTROL

Flow control is a mechanism which allows you to protect the switch from

overload conditions and to keep additional traffic off the network when

excessive congestion will result. Figure C-1 illustrates flow control for both

half and full duplex applications.

Figure C-1. Flow Control for Full and Half Duplex Applications

Each port of the switch has a transmit queue which buffers frames to be

sent out on that port. In this example, large amounts of data are being

sent from Workstation A (connected to port X) and other ports on the

switch to Workstation B (connected to port Y).The queue on port Y starts

filling up with data until it reaches a determined threshold. The packet

which causes the threshold to be exceeded triggers the Flow Control

function on the port from which the packet entered the switch, in this case

port X.

Since port X is configured with Flow Control set to Enabled, the switch

responds by initiating a pause frame (full duplex applications) or back-

pressure mechanism (half duplex applications). The pause frame causes

Workstation A to stop sending packets. After a certain amount of time has

elapsed, determined by a value in the pause frame, Workstation A will

resume sending data. Similarly, the back-pressure mechanism forces

Workstation A to stop sending packets by inducing collisions on port X.

The pause frame flow control mechanism supported by the ELS100-

24TXG switch conforms with the IEEE 802.3x specification for full duplex

flow control.

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The ELS100-24TXG Port Statistics Screen indicates the number of pause

frames that have been sent, indicating the number of times full duplex flow

control has occurred. For the full duplex pause frame mechanism to work,

the device connected to the switch port must also support IEEE 802.3x

flow control. Flow Control is configurable per port in the Port Configuration

Menu of the console menu or via SNMP.

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APPENDIX D. VIRTUAL LANS (VLANS)

VLANs and Frame Tagging

The ELS100-24TXG supports IEEE 802.1Q-compliant virtual LANs

(VLANs). This capability provides a highly efficient architecture for

establishing VLANs within a network and for controlling broadcast/

multicast traffic between workgroups. Central to this capability is an

explicit frame tagging approach for carrying VLAN information between

interconnected network devices.

With frame tagging, a four byte data tag field is appended to frames that

cross the network. The tag identifies which VLAN the frame belongs to.

The tag may be added to the frame by the end station itself or by a

network device, such as a switch. In addition to VLAN information, the

relative priority of the frame in the network can specified by the tag (see

Appendix E, “Class of Service”).

In the example in Figure D-1 below, the workstations attached to the top

switch are members of the same two VLANs as the workstations attached

to the bottom switch. The 802.1Q tags are used to carry VLAN information

in the frames traveling between the two switches.

Figure D-1. Two Switch VLAN Configuration

If the ELS100-24TXG is so configured, and, if the frame does not already

contain a tag, a VLAN identifier is placed in a tag which is appended to

frames as they are received by the switch. Within the switch and between

switches compliant with IEEE 802.1Q, these identifiers are used to control

the destination of broadcast frames, preventing them from being flooded

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to all connected stations and interfaces. When frames are forwarded back

to destination end stations, the tag may or may not be stripped off,

depending on the configuration of the end station and the switch port.

By using 802.1Q tagged VLANs, users from physically dispersed

locations can be formed into groups by assigning them to specific VLANs.

Broadcast and multicast traffic for these specific VLANs can be directed

across the network without being radiated out to stations that are not

members of the same VLANs. Up to 4094 different VLANs can be

specified by the 802.1Q tag, thus permitting the configuration of up to

4094 virtual workgroups. This implementation is nonintrusive to end-

station applications and the associated clients.

ELS100-24TXG VLAN Configuration

VLAN operation on the ELS100-24TXG is disabled by default. When

VLANs are enabled, all frames are transferred internally through the

switch with a VLAN tag. This tag may already be on the frame entering

the switch, or added to the frame by the switch. VLAN information already

existing on frames entering the switch is automatically handled by the

switch. The ELS100-24TXG learns VLAN information from tagged frames

and appropriately switches frames out the proper ports based on this

information. The configuration of VLANs for frames entering the switch

without tags must be made by the user of the switch. This configuration

can be made either through the VLAN Menu in the console interface or

via SNMP. The parameters used to configure VLANs on the ELS100-

24TXG are explained below.

VLAN ID

The VLAN ID is used to uniquely identify different VLANs on a network.

The VLAN ID information is contained in the 802.1Q tag header on a

frame, and so identifies the VLAN to which a frame belongs. The ELS100-

24TXG recognizes VLAN IDs in the tags on frames entering the switch,

and can also add tags with an appropriate VLAN ID to untagged frames.

Ports in VLAN

When configuring VLANs on the ELS100-24TXG, individual ports are

assigned to specific VLANs by setting the Port VLAN ID (PVID) for each

port. Frames entering the switch which are untagged are automatically

assigned a VLAN ID by the switch based on the PVID of the incoming

port. The Ports in VLAN parameter makes the assignment of ports to

PVIDs. An individual port can only be assigned to a single PVID with this

parameter.

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VLAN Egress Ports

The VLAN Egress Ports parameter is used to assign ports to a VLAN for

carrying VLAN tagged frames across a network. The assignment of

egress ports does not affect the assignment of VLAN IDs to frames

entering the switch. However, frames exiting the switch may be sent out

the egress ports configured for a specific VLAN ID. Frames exiting the

switch via egress ports for a given VLAN are normally tagged.

VLAN Access Ports

Individual ELS100-24TXG ports can be configured as one of two types for

the purpose of VLAN configuration: Access or Hybrid. A VLAN Access

port is used to connect one or more VLAN-unaware devices to the switch.

VLAN tagged frames are not allowed to enter or exit an Access port. If a

tagged frame enters the switch on an Access port, the switch will drop the

frame. End-user stations which do not support 802.1Q tags should be

attached to ports on the switch configured as Access ports.

In Example 1 in Figure D-2, both ports are designated as Access ports.

The ports are both configured to be on VLAN X. An untagged frame (1)

comes in through the left port and gets tagged with a VLAN X tag (2),

based on the incoming port PVID. As the frame exits through the right

port, the tag is stripped (3) since the outgoing port is an Access port as

well and can only transmit untagged frames. The frame can propagate

through the switch in this example only because both ports are on the

same VLAN.

In Example 2 in Figure D-2, both ports are also Access ports, however the

port on the left is on VLAN X while the port on the right on VLAN Y. The

untagged frame (1) comes in through the left port and again gets tagged

with a VLAN X tag (2). However, because the outgoing port is on a

different VLAN (VLAN Y), the frame is dropped. In general, frames cannot

propagate between ports unless both ports belong to the same VLAN.

Figure D-2. VLAN Access Ports

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VLAN Hybrid Ports

A VLAN Hybrid port is used to connect one or more VLAN-aware or

VLAN-unaware devices to the switch. Both tagged and untagged frames

can be received and transmitted on Hybrid ports. Egress ports should

typically be configured as Hybrid ports.

When a frame with an unlearned source MAC address enters a Hybrid

port, the learning of that address and its associated VLAN is dependent

on whether the frame is tagged or not. If the frame is untagged, its source

MAC address is learned as a non-tagging station, with a VLAN ID equal

to the input port PVID. All frames subsequently sent to that MAC address

from this Hybrid port will be untagged. If the frame is tagged, its source

MAC address is learned as a tagging station, with a VLAN ID equal to the

value of the VLAN ID in the tag. All frames subsequently sent to that MAC

address from this Hybrid port will be tagged with that same VLAN ID.

In Example 1 in Figure D-3A, two ports are configured with two different

PVIDs, X and Y. A frame arrives (1) with a tag for VLAN Z. If the

destination MAC address of that frame has already been learned on the

destination port as a tagged station with the same VLAN ID of Z, the frame

is sent out that port (3) with the VLAN Z tag still appended to it. If the

address has not been learned with the VLAN ID of Z on the destination

port, the frame is dropped.

In Example 2 in Figure D-3A, a similar scenario to Example 1 occurs,

except that the incoming frame (1) is tagged with a VLAN Y tag. The frame

is being sent (2) to a port that belongs to VLAN Y. In this case, the

decision to append a VLAN Y tag or not to the outgoing frame depends

on whether the destination MAC address has been learned as a tagged

or as an untagged station. In this example, it was learned as an untagged

station, so the frame is sent out without a tag (3).

Identifiers

X,Y, Z = VLAN

H = Hybrid

Port

Example 1

Example 2

Figure D-3. VLAN Hybrid Ports (Examples 1 and 2)

86 Virtual LANs (VLANs)

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In Example 3 in Figure D-3B, an untagged frame arrives at the left port

(1). The switch tags the frame with the PVID for VLAN X (2). Since the

destination MAC address has already been learned as a tagged station

on VLAN X on the outgoing port, the frame is sent out with a VLAN X tag.

Example 4 in Figure D-3B is similar to Example 3 except that both ports

(incoming and outgoing) have a VLAN X PVID. The untagged frame

arrives at the incoming port (1) and gets tagged with a VLAN X tag (2).

The tag may or may not be stripped off as the frame exits the switch,

depending on how the MAC address of the destination device was

learned (3). In this example, the destination was learned as an untagged

station so the tag is stripped. This Hybrid port example is thus essentially

the same as the Access port case in Figure D-2, Example 1.

When sending broadcast or unknown DA unicast frames

out a Hybrid port, the frames are always tagged. The

VLAN ID of the tag is identical to the VLAN ID that was as-

signed to the frame when it entered the switch on the

source port.

Figure D-3B. VLAN Hybrid Ports (Examples 3 and 4)

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VLAN Application Example

A network administrator can use VLANs to define user groups regardless

of the physical LAN segment to which they are connected. The use of

Hybrid and Access links can further refine traffic flow in a multi-switch

environment. Figure D-4 shows the combination of both Hybrid and

Access links used in a network with three different VLANs. Workstations

are typically connected to the ELS100-24TXG via Access links. On the

internal corporate network (backbone), VLAN tags are used to identify the

VLAN association of frames.

It is possible to mix VLAN-aware and VLAN-unaware de-

vices on the same Hybrid switch port. However, this is not

recommended design practice.

Figure D-4. VLAN Application Example

88 Virtual LANs (VLANs)

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APPENDIX E. CLASS OF SERVICE

Class of Service support on the ELS100-24TXG allows you to assign

mission-critical data a higher priority through the switch by delaying less

critical traffic during periods of congestion. Higher priority traffic through

the switch is serviced first before lower priority traffic. The Class of

Service capability of the ELS100-24TXG switch is implemented by a

priority queuing mechanism. Class of Service is based on the IEEE

802.1p draft standard specification and allows you to define two priorities

of traffic on each switch port:

•

high

normal

As traffic enters the switch, it is assigned to one of the two priority levels

according to information located in the 802.1Q header tag of the frame

(see Appendix D, “Virtual LANs”) or according to the incoming port

number. Frames are then placed into one of two transmit queues on the

outbound switch port based on their priority level. Frames on the high

priority queue are transmitted first; when that queue empties, traffic on the

normal priority queue is transmitted. When priority queuing is being used,

each frame that passes through the switch contains a priority level in its

header tag. The priority information may already exist in incoming frames,

or be assigned by the switch. The determination of individual frame

priority is based on the following rules:

1. Incoming tagged frames contain a priority level (range: 0-7)

2. Incoming non-tagged frames are assigned a preconfigured default

priority level based on their incoming port (range: 0-7). The

assignment of priority per port is done via management using the

Port Priority Default parameter.

3. Priority levels of frames are compared against a reconfigured global

priority threshold setting, configured via management using the

Priority Threshold parameter. Those frames with levels equal to or

above the threshold are designated high priority traffic; those frames

with levels below the threshold are designated normal priority traffic.

The default setting for the threshold parameter is: 4 and above = High

Priority, 3 and below = Normal Priority.

Properly configured, the Class of Service mechanism assures that during

congestion, the highest priority data does not get delayed by normal

priority traffic. The tagged header in the frame governs individual frame

priority.

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Figure E-1 shows priority queuing operating within a switch. Frames

entering the switch through ports 1 and 4 are tagged as normal traffic and

placed in a normal priority queue on the outbound port. Frames entering

through ports 2 and 5 are tagged as high priority traffic and placed in a

high priority queue on the outbound port. Priority queuing can be

configured using the Class of Service Configuration Menu in the console

interface or via SNMP.

Figure E-1. Class of Service Example

90 Class Of Service

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APPENDIX F. ACRONYMS & ABBREVIATIONS

Term

Definition

10Base-T

10 Mbps twisted-pair Ethernet

100Mbps twisted-pair Fast Ethernet

1000Mbps Gigabit Ethernet

100Base-TX

1000Base-X

1000Base-SX

1000Mbps Gigabit Ethernet, short-wave laser

over multi-mode fiber

1000Base-LX

1000Base-CX

1000Mbps Gigabit Ethernet, long-wave laser

over single- or multi-mode fiber

1000Mbps Gigabit Ethernet, over shielded,

balanced copper

ANSI

American National Standards Institute

Application Specific Integrated Circuit

Bootstrap Protocol

ASIC

BootP

BPDU

CAT5

CoS

Bridge Protocol Data Unit

Category 5

Class of Service

CRC

Cyclic Redundancy Check

CSMA/CD

Carrier Sense Multiple Access/Collision Detec-

tion

DCE

DHCP

DSR

DTE

DTR

GBIC

ICMP

IEEE

Data Communications Equipment (modem)

Dynamic Host Configuration Protocol

Data Send Ready

Data Terminal Equipment

Data Terminal Ready

Gigabit Interface Converter

Internet Control Message Protocol

Institute of Electrical and Electronics Engineers

Internet Protocol

LAN

MAC

LED

MDI

Local Area Network

Media Access Control

Light Emitting Diode

Media Device Interface

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Term

MIB

Definition

Management Information Base

Port VLAN ID

PVID

RFC

Request for Comment

Remote Monitoring

RMON

RXD

Receive Data

SNMP

STP

Simple Network Management Protocol

Spanning Tree Protocol

TCP/IP

Transmission Control Protocol/Internet Proto-

col

TFTP

TXD

Trivial File Transfer Protocol

Transmit Data

UTP

Unshielded Twisted Pair

Virtual Local Area Network

Wide Area Network

VLAN

WAN

92 Acronyms & Abbreviations

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INDEX

1000Base-X, 1000Base-SX/LX/CX

ports, 29

console port, 11, 25

connecting to, 25

10Base-T/100Base-TX Pinouts, 81, 83

802.1D, 14, 79, 87

Spanning Tree Protocol, 66, 85

802.1p, 10, 18, 79, 97

802.1Q, 10, 79, 91, 92, 93

802.2, 79

defined, 11

pin assignments, 81

cost component of each port, 87

crossover cable, 28

cut-through, 14

802.3, 28, 79

802.3i, 9, 79

802.3u, 9, 79

Data Rate, 79

802.3x, 10, 79, 89, 90

802.3z, 9, 79

Default Gateway, 36

setting, 71

designated bridges, 88

Download Software Menu, 35, 58

downloading a software upgrade, 15, 65,

architecture, 10

auto-negotiation, 51, 52

configuring, 69

downloading via TFTP, 66

downloading via the serial port, 65

DTE connection, 25

dynamic MAC addresses, 69

base MAC address, 57

BootP/DHCP, 17

configuring, 71

Electrical Specifications, 80

bridge, 87, 88

Environmental Specifications, 79

communicating between bridges,

priority, 42

broadcast throttling, 17

configuring, 71

factory defaults, 33

fan outlets, 13

flow control, 18, 89

802.3x, 89, 90

features, 9

cable

RS-232, 25

certification, 79

forward delay, 42

Forwarding Table, 14, 39

configuring, 69

Class of Service, 18, 97, 98

802.1p, 97

Forwarding Table Configuration Menu,

configuring, 68

frame tagging, 18, 91

front panel, 11

front panel components, 11

full duplex mode, 17

Class of Service Configuration Menu, 49

client/server network application, 19

communication settings, 25

community names, 37, 63

configuring the switch

common tasks, 61

connecting network cables, 27

General Information Screen, 35, 57

Gigabit Ethernet ports, 16, 52

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port LEDs, 12

defined, 13

Hello Time, 42

Port Menu, 35, 51

port mirroring, 16

configuring, 64

port operation

configuring, 68

port priority, 43

Port Priority Menu, 50

Port Specifications, 81

Port Statistics Screen, 55

power connector, 13

power cord, 26

inspecting your shipment, 21

IP address

assigning, 62

LED mode button, 11, 12, 13

defined, 11

LEDs, 11, 12, 13

local backbone application, 20

power cord set requirements, 82

power LED, 11

defined, 11

power source, 21

power switch, 13

powering the switch, 26

power-up count, 57

power-up tests, 26

Priority Default, 50

Priority Threshold, 49

Logout, 35, 59

MAC addresses, 69

Main Menu, 31, 35

Max Age, 42

MDI/MDI-X Crossover Cable Wiring, 82

MDI-X, 28

Memory, 80

rear panel, 13

remapping network topology, 88

reset, 35, 60

resetting the switch, 60

Return to Default Configuration, 35, 59

RJ-45 connectors, 28

RMON, 16, 75

menu hierarchy, 34

MIB, 73, 74, 75, 78

MIB-II, 74

Microprocessor, 80

mirrored port, 38

mirroring port, 38

modes of access

read-only and read/write, 32

mounting ears, 23, 24

mounting the switch

rack, 24

Root Bridge, 88

router, 36, 73

table or shelf, 22

wall, 23

Save Current Configuration, 35, 59

SC fiber connector, 29

screen timeout, 62

serial number, 57

site requirements, 21

SNMP, 15, 37, 63, 73, 74, 78

setting access, 63

network configuration status, 63

non-volatile parameter storage, 15

SNMP Configuration Menu, 37

software version, 57

Spanning Tree, 14, 15, 66, 86, 87

Spanning Tree Configuration Menu, 41

Spanning Tree Parameters

configuring, 66

password protection, 15, 32, 62

Path Cost, 43, 44

performance, 10

Physical Specifications, 80

Port Configuration Menu, 52

Spanning Tree Port #n Configuration

Menu, 44

94 Index

ELS100-24TXG

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Spanning Tree Port Configuration Menu,

Spanning Tree Protocol

defaults, 87

Standards Compliance

IEEE, 79

Unshielded Twisted Pair (UTP), 27

Up Time, 57

user access, 32

store-and-forward, 14, 87, 100

Switch Configuration Menu, 35, 38

switch statistics, 64

Switch Statistics Screen, 35, 53

Switch Summary Screen, 54

System Configuration Menu, 35, 36

Ventilation, 21

VLAN #n Configuration Menu, 47

VLAN Access Ports, 48, 92, 93

VLAN application example, 96

VLAN Configuration Menu, 45

VLAN egress ports, 46

VLAN Hybrid ports, 48, 94, 95

VLAN Menu, 46

Telnet, 31

VLAN Port Menu, 48

VLANs, 18

connecting, 63

terminal, 15, 25, 99

Test LED, 11, 27

defined, 11

TFTP download, 66

TFTP file name, 58

802.1Q, 91

configuring, 67

VT100, 15

workgroup hubs, 20

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591-0046-03A

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