®
ONline Ethernet Bridge Module
Installation and Operation
Guide
Document Number 17-00104-5
Printed March 1996
Model Number: 5102B-EE
Software Version: 2.12
3Com Corporation
118 Turnpike Road
Southborough, MA 01772-1886
U.S.A.
(508) 460-8900
FAX (508) 460-8950
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The 3Com Multichannel Architecture Communications System is
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Contents
How to Use This Guide
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Structure of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi
Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xix
3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx
Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx
Chapter 1 — Introduction
The Bridge Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Bridge Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Interoperability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
ONline System Concentrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Ethernet Transceivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Ethernet Repeaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Other Bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Spanning Tree Loop Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Traffic Localization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Topology Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Automatic Address Learning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
High-Performance Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Transparent Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Downloadable Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Network Management Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Media Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
AUI and Backplane Connections . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Backplane Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Diagnostics and Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
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Chapter 2 — Installation
Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Summarized Bridge Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . 2-3
Module Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Module Extractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Dip Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Channel-Select Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Related Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
LED and Channel Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Remote Network Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Pre-Installation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Connecting a Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Connecting to the Bridge Module RS-232 Port . . . . . . . . . . . . . 2-14
Connecting the Transceiver Cable . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Setting Bridge and Channel Parameters . . . . . . . . . . . . . . . . . . . . . 2-15
Confirming Bridge Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Chapter 3 — Management Functions
Using Bridge Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Connecting to the Management Interface . . . . . . . . . . . . . . . . . 3-2
Entering and Editing Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Command Completion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Examining Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Modifying Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Saving Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Bridge Management Parameter Overview . . . . . . . . . . . . . . . . . . . . . 3-9
Management Interface Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Configuring the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Setting Bridge Module Terminal Options (Optional) . . . . . . . . . 3-11
Automatic Modem Hangup . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Configuring the Bridge Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Establishing Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Establishing the Administrator Password . . . . . . . . . . . . . . . . . . 3-13
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Establishing the User Password . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Configuring Other Bridge Module Parameters . . . . . . . . . . . . . 3-14
Bridge Module Name (Alias) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Bridge Module Management Prompt . . . . . . . . . . . . . . . . . . . . 3-15
Contact Name and Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Terminal Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Concentrator Reboot Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Setting SNMP Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Community Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Subnetwork Mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Alert Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Remote Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Bridge Module Operation and Performance (Configuration) . . . . . . 3-19
AGEING_TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Spantree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Filtering Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Static Address Filter Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Statistics Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
SHOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
CLEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Logging Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Chapter 4 — Management Commands
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Chapter 5 — Troubleshooting
Applying Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
PowerUp Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Management Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Bridge Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
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Chapter 6 — Firmw are Dow nload Instructions
Download Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Download Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Download Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Install the ProComm Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Connect the RS-232 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Download the New Bridge Module Software . . . . . . . . . . . . . . . . . . 6-8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
ProComm Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Bridge Module Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Appendix A — Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Interconnect Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Special Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Appendix B — Spanning Tree Discussion
Spanning Tree Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Spanning Tree Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Spanning Tree Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Appendix C — Cable Pinouts
Transceiver Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Transceiver Cable Differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Shielding and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
IEEE 802.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
V2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
V1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Cable Configuration Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
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Cable Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Troubleshooting Transceiver Cables . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Symptoms of Bad Transceiver Cables . . . . . . . . . . . . . . . . . . . . . C-6
Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
RS-232 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Appendix D — Pow er-Up Self-Test
Initiating Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Front Panel LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-3
When an Error Occurs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4
Appendix E — Technical Support
On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Support from Your Network Supplier . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Returning Products for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
Index
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Figures
Figure 1-1.
Bridge Module Hardware Design . . . . . . . . . . . . . . . . . . 1-7
Sample Bridge Module Configuration . . . . . . . . . . . . . . 1-10
Backplane Channel Bridged to Broadband Segment . . . 1-11
Backplane Channels Bridged Together . . . . . . . . . . . . . 1-12
Bridge Module Front Panel . . . . . . . . . . . . . . . . . . . . . . . 2-4
Bridge Module and Dip Switch Location . . . . . . . . . . . . . 2-6
Connecting Loopback Connector . . . . . . . . . . . . . . . . . 2-10
Installing the Bridge Module . . . . . . . . . . . . . . . . . . . . . 2-11
Connecting Transceiver Cable . . . . . . . . . . . . . . . . . . . . 2-15
Installed Bridge Module . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Initial Installation Screen . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
ProComm Installation Screen . . . . . . . . . . . . . . . . . . . . . 6-6
Post-ProComm Installation Screen . . . . . . . . . . . . . . . . . . 6-7
Initial UDK Installation Screen . . . . . . . . . . . . . . . . . . . . . 6-9
ProComm Header Screen . . . . . . . . . . . . . . . . . . . . . . . 6-10
ProComm Status Line Screen . . . . . . . . . . . . . . . . . . . . 6-11
ProComm Pop-Up Menu Screen . . . . . . . . . . . . . . . . . . 6-13
ProComm Download Screen . . . . . . . . . . . . . . . . . . . . . 6-14
Exit ProComm Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Spanning Tree Network Architecture . . . . . . . . . . . . . . . B-3
Configuration With Multiple Bridge Modules . . . . . . . . . B-5
Bridge Module Female AUI Connector . . . . . . . . . . . . . . C-2
Figure 1-2.
Figure 1-3.
Figure 1-4.
Figure 2-1.
Figure 2-2.
Figure 2-3.
Figure 2-4.
Figure 2-5.
Figure 2-6.
Figure 6-1.
Figure 6-2.
Figure 6-3.
Figure 6-4.
Figure 6-5.
Figure 6-6.
Figure 6-7.
Figure 6-8.
Figure 6-9.
Figure B-1.
Figure B-2.
Figure C-1.
Figure C-2.
Management Interface RS-232 Connector and Cable
Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
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Tables
Table 1-1.
Packet Distribution by Bridge Module . . . . . . . . . . . . . . . 1-6
Bridge Module LEDs, Button, and Connectors . . . . . . . . . 2-5
Channel Select Dip Switch Settings . . . . . . . . . . . . . . . . . 2-7
Channel Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Power-Up Problem Resolution . . . . . . . . . . . . . . . . . . . . 2-12
Bridge Module Default Terminal Settings . . . . . . . . . . . . 2-13
RS-232 Cable Guidelines . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Command Line Key Functions . . . . . . . . . . . . . . . . . . . . . 3-3
Procedures for Getting Started. . . . . . . . . . . . . . . . . . . . . 3-7
Table 2-1.
Table 2-2.
Table 2-3.
Table 2-4.
Table 2-5.
Table 2-6.
Table 3-1.
Table 3-2.
Table 3-3.
Bridge Module Terminal Parameter Options and Factory
Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Table 4-1.
Table 4-2.
Table 4-3.
Bridge Module Command Index . . . . . . . . . . . . . . . . . . . 4-3
SHOW BRIDGE Command Attributes . . . . . . . . . . . . . . . 4-88
SHOW COUNTER BRIDGE Command
Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-92
Table 4-4.
Table 4-5.
SHOW COUNTER PORTS Command Attributes. . . . . . . . 4-94
SHOW COUNTER PROTOCOLS Command
Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-98
Table 4-6.
Table 4-7.
Table 4-8.
Table 5-1.
Table 5-2.
Table 5-3.
Table 6-1.
Table 6-2.
Table C-1.
Table C-2.
Table C-3.
Table C-4.
Table 4-1.
SHOW COUNTER SPANTREE Command Attributes. . . . 4-100
SHOW DEVICE Command Attributes . . . . . . . . . . . . . . 4-102
SHOW SPANTREE Command Attributes . . . . . . . . . . . . 4-110
Applying Power Suggestions . . . . . . . . . . . . . . . . . . . . . . 5-2
Power-Up Self-Test Suggestions. . . . . . . . . . . . . . . . . . . . 5-3
Management Interface Suggestions . . . . . . . . . . . . . . . . . 5-4
UDK Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Bridge Module Download Error Messages . . . . . . . . . . . 6-17
AUI Cable Pin Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Transceiver Cable Wire Sizes . . . . . . . . . . . . . . . . . . . . . . C-4
Maximum Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . . C-6
RS-232 Cable Pin Chart . . . . . . . . . . . . . . . . . . . . . . . . . . C-8
Diagnostic Code Reference . . . . . . . . . . . . . . . . . . . . . . . D-2
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How to Use This Guide
This guide describes the architecture, principal features, operating
characteristics, and diagnostic procedures of the ONline™ Ethernet Bridge
Module. It also describes the controls and indicators of the Bridge Module
and explains how to install and verify its operation. This guide is applicable
for firmware Version 2.12 of the module.
Audience
This guide is intended for the following people at your site:
❑ Network manager or administrator
❑ Hardware installer
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Structure of This Guide
This guide contains six chapters and four appendices:
Chapter 1, Introduction – Introducesthe ONline Ethernet Bridge Module
from a functional point of view and explains the front panel LEDs, button,
and connectors.
Chapter 2, Installation – Discusses important setup information and
provides illustrated procedures for installing, configuring, and verifying the
operation of the Bridge Module.
Chapter 3, Management Functions – Describes the management
capabilities of the Bridge Module, such as setting a password or viewing
network statistics.
Chapter 4, Management Commands – Provides a complete reference of
Bridge Management commands, parameters, and values.
Chapter 5, Troubleshooting – Provides help in isolating and correcting
problems that can arise during installation and during normal operation.
Chapter 6, Firmw are Dow nload Instructions – Describes the process
you will need to follow to download new firmware to your Bridge Module
when upgrades are issued from 3Com.
Appendix A, Specifications – Provides Bridge Module product
specifications.
Appendix B, Spanning Tree Discussion – Explains the Spanning Tree
Parameters that can be set within the Bridge Module and describes how a
network configuration would appear using Spanning Tree.
Appendix C, Cable Pinouts – Shows the pinouts for the transceiver cable
and RS-232 cable.
Appendix D, Pow er-Up Self-Test – Describes the Bridge Module
power-up self-test routines and lists error codes and solutions.
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Appendix E, - Technical Support – Lists the various methods for
contacting the 3Com technical support organization and for accessing
other product support services.
In de x
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Document Conventions
The following document conventions are used in this manual:
Convention
Courier text
Indicates
User input
Example
In the Agent Information Form,
enter MISin the New Contact
field.
System output
Path names
After pressing the Apply
button, the system displays
the message
Transmitting data.
Bold command
string
Before you begin, read the
readme.txt file located in
/usr/snm/agents.
Italic text in braces User-substituted Use the following command to
identifiers
show port details:
SHOW PORT {slot.all} VERBOSE
Capitalized text in
plain brackets
Keyboard entry Type your password and press
by the user
[ENTER].
Italics
Text emphasis,
Ensure that you press the Apply
document titles button after you add the new
search parameters.
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Convention
Note:
Indicates
Example
A Note. The
information is
important
Note: Use STP lobe
cables for your system.
Caution: A Caution. A
condition may
damage
Caution: Do not put
your installation
diskettes on a
software or
hardware
magnetic surface.
This may damage the
diskettes.
Warning: A Warning. A
condition may
Warning: Wear eye
protection when
performing these
maintenance
threaten
personal safety
procedures.
Related Documents
This section providesinformation on suppo rting documentation, including:
❑ 3Com Documents
❑ Reference Documents
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3Com Documents
The following documents provide additional information on 3Com
products:
17-Slot ONline System Concentrator Installation and Operation
Guide – Explains how to install, operate, and manage the 3Com ONline
17-Slot System Concentrator (Models 5017C-LS and 5017C with load
sharing).
6-Slot ONline System Concentrator Installation and Operation
Guide – Explains how to install, operate, and manage the 3Com ONline
6-Slot System Concentrator.
ONline Ethernet Management Module Installation and Operation
Guide – Explains how to install, operate, and use the 3Com ONline
Ethernet Management Module.
ONline Management Commands Guide – Provides an alphabetized
reference resource describing all ONline management commands.
For a complete list of 3Com documents, contact your 3Com representative.
Reference Documents
The following documents supply related background information:
Case, J., Fedor, M., Scoffstall, M., and J. Davin, The Simple Network
Management Protocol, RFC 1157, University of Tennessee at Knoxville,
Performance Systems International and the MIT Laboratory for Computer
Science, May 1990.
Rose, M., and K. McCloghrie, Structure and Identification of
Management Information for TCP/IP-based Internets, RFC 1155,
Performance Systems International and Hughes LAN Systems, May 1990.
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Introduction
1
This chapter describes the ONline™ Ethernet Bridge Module basic
capabilities, operation, and system configuration alternatives. The ONline
Ethernet Bridge Module is referenced throughout this manual as the Bridge
Module.
The Bridge Module
The Bridge Module is a high-performance bridge that transparently
interconnects your facility-wide Ethernet and IEEE802.3 networksto form a
single extended LAN. The Bridge Module fits into your ONline System
Concentrator unit using only two slots and allows you to perform the
following functions:
❑ Interconnect Ethernet and IEEE 802.3 subnetworks
❑ Isolate local traffic on subnetworks through dynamic and permanent
packet filtering
❑ Configure redundant LAN interconnection by using the IEEE 802.1(d)
Spanning Tree Protocol
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❑ Monitor your extended LAN using network management features
including:
–
–
–
Traffic counters
Diagnostic information
Address Table information
Bridge Module Features
The following section describes the major features of the Bridge Module.
These features include:
❑ Interoperability
❑ Spanning Tree Loop Control
❑ Traffic Localization
❑ Automatic Address Learning
❑ High Performance Design
❑ Transparent Operation
❑ Downloadable Firmware
❑ Network Management Capabilities
❑ Media Configuration Options
❑ Diagnostics and Self-Test
Interoperability
The Bridge Module providesone external15-pin transceivercable connector
for hookup to an Ethernet and/or IEEE 802.3 subnetwork. If you do not
make this external connection, both the incoming and outgoing
connections are made over the backplane.
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Depending upon the type of bridge connection you select (backplane or
the AUI connection), an individual port can connect to any of the following
devices:
–
–
–
–
ONline System Concentrator
Ethernet transceivers
Ethernet repeaters
Other data-link bridges
ONline System Concentrator
You can connect to another concentrator through the AUI port or through
another module that is on the same channel as the Bridge Module. For
example, you can use an ONline Fiber Module on the same channel as the
bridge backplane connection to interconnect 10BASE-FB Stars, ONline
System Concentrators,LAN-TO-LANHubs,10BASE-FB/PCAdapterCards,or
10BASE-FB Transceivers.
Ethernet Transceivers
You can use the Bridge Module to interconnect Ethermodem Broadband
Ethernet LANs with the ONline System Concentrator. The Bridge Module
front panel AUI port connects to a male AUI port on the Ethermodem
transceiver. It can also be connected to the following transceivers:
–
–
–
–
A transceiver multiplexer such as DEC's DELNI™
A transceiver on a standard Ethernet coaxial cable
A transceiver on a thin coaxial or twisted pair cable
An Ethermodem broadband transceiver
Ethernet Repeaters
You can use the Bridge Module to interconnect Ethernet/IEEE 802.3
subnetworks that contain repeaters. The bridge acts as a node on each
subnetwork to which it is attached, and therefore does not affect the
maximum distance or repeater limitations.
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Other Bridges
The Bridge Module can operate on an expanded LAN that contains other
bridges under the following two conditions:
1. The other bridges must forward packets transparently at the data link
layer.
2. The total end-to-end delay in the extended network must not exceed
the time-out requirements of higher level protocols. 3Com does not
recommend configuring the Bridge Module on networks with more
than seven (7) bridge hops between any two nodes.
You can connect the Bridge Module to any of the above devices in various
combinations and configurations. Refer to the section in this chapter,
Media Configuration Options, for configuration examples and diagrams.
Note: The Bridge Module is not compatible with Ethernet Version
1 transceivers or cables.
Spanning Tree Loop Control
The Spanning Tree Algorithm and Protocol (STAP)is used among bridges in
a LAN to ensure only single paths exist between stations. The Spanning
Tree protocol is needed when there are parallel bridges forming a loop
between Ethernet LANs on the network. This type of network also provides
redundancy throughout the network so that if the primary bridge fails, a
backup bridge will take over within 10 to 20 seconds.
If there are multiple Bridge Modules or Midnight Bridges between LANs on
the network, the Spanning Tree protocol ensures that only one bridge
enters the data sending (or forwarding) state. This bridge is called the
Designated bridge.Other bridges remain in the blocking state untilneeded.
While in the blocking state the bridge does not forward packets, but it does
continue to monitor and participate in the Spanning Tree protocol. If the
designated bridge fails for any reason, the blocked bridge will learn of the
failure through the Spanning Tree protocol and enter the forwarding state.
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More information about the Spanning Tree protocol is included in
Appendix B.
Traffic Localization
The Bridge Module is a packet store-and-forward device that receives all
packets and, if necessary, forwards them from the subnetwork on one side
of the bridge to the subnetwork on the other side. The Bridge Module also
acts as a packet filter, filtering packets based upon local destination
addresses.
Filtering can isolate high traffic subnetworks from the rest of the LAN. For
example, if the systems and servers in a cluster or subnetwork usually
communicate with each other and rarely communicate with systems on
other LANs, the Bridge Module does not forward that traffic to the
extended LAN, except as needed.
The Bridge Module allows you to set up to 100 device addresses to be
always forwarded to or never forwarded to. This can be used to keep
sensitive subnetwork traffic local at all times. Enhanced network
performance is also gained through the use of this feature.
Topology Sw itching
Topology switching enables you to automatically change the extended LAN
topology without having to recable or take the network down. Bridging
functionality lets you switch between any two ONline channels or between
any ONline channel and an external Ethernet network. Topology switching
is performed using the Bridge Module's command interface. The Bridge
Module automatically recalculates the Spanning Tree to reorient the bridge
in the network.
Automatic Address Learning
When attached to a subnetwork, the Bridge Module dynamically learnsthe
addresses of all nodes on the subnetwork - thus it is called a learning
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bridge. The Bridge looks at the source address of each packet generated on
the subnetwork and creates a database containing these addresses.
Note: If a node does not generate any packets, its location
cannot be dynamically learned by the Bridge Module.
When a packet is received by the Bridge Module, its destination address is
compared with the addresses in the source subnetwork database. Table 1-1
describes what happens when a packet is received by the Bridge Module.
Table 1-1. Packet Distribution by Bridge Module
The Destination Address is..
The Packet is...
Found in the source
subnetwork database
Considered to be local to that
subnetwork (itssource and destination
are on the same subnetwork). The
Bridge Module does not forward the
packet.
Not found in the source
subnetwork database
Considered to be on a different
subnetwork and forwarded onto the
other subnetwork (or the destination
node has not generated any traffic).
High-Performance Design
While address filtering can reduce traffic loads on your network, it is
important to overall network integrity for a learning bridge to run as fast as
the network. The Bridge Module ensureshigh performance in the following
ways:
1. It uses high-speed multi-port memory so the IEEE 802.3 controllers
and the CPU all have separate access to the common packet memory.
Once a packet is received into this memory, it does not have to be
copied to be forwarded.
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2. It uses dedicated hardware to accelerate the address filtering
operation to ensure the highest possible performance in an 802.3 to
802.3 bridge (Figure 1-1).
Figure 1-1. Bridge Module Hardw are Design
Transparent Operation
The ONline Ethernet Bridge Module operates transparently to other
stations on the LAN, therefore no special software is required on any
other station. This means an extended LAN using Ethernet Bridge
Modules can support any protocol that runs over IEEE802.3 LANs, such
as Sun Microsystems NFS, Novell Inc. NetWare, 3Com 3+, and other
products based on protocols such as XNS, TCP/IP, and ISO.
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Dow nloadable Firmw are
As firmware upgrades become available from 3Com, you can download
this new firmware to your Bridge Module using an IBM-compatible PC
connected to the module's RS-232 serial port. Downloadable firmware
ensures that you have access to new features as soon as possible - saving
the cost, time, and inconvenience of installing new PROM chips. This
feature is explained in detail in Chapter 6, Firmware Download Instructions.
A 3Com Firmware Distribution Kit (Part number 5000-FDK) is necessary for
downloading the firmware to your Bridge Module. This kit contains the
appropriate RS-232 cable and software for performing future firmware
upgrades. The kit is ordered as a single copy per site, supporting multiple
Bridge Modules. The upgrades themselves are contained in another kit, the
Ethernet Bridge Update Distribution Kit (Part number 5102B-UDK-x.x).
The Ethernet Bridge Update Distribution Kit is available in two versions -
limited and unlimited. The limited version (5102B-UDKL-x.x) allows you to
upgrade only one Bridge Module. The unlimited version (5102B-UDKU-x.x)
enables you to upgrade an unlimited number of Bridge Modules.
Netw ork Management Capabilities
You access the Bridge Module management functions through an
out-of-band connection via the serial RS-232 port on the front panel. You
can also access the module through an inband connection from an existing
Bridge Module, Midnight Bridge, or network management module. To
manage all other Bridge Modules and manageable devices in the extended
LAN via inband management, you must first log out of the current session
and then log in to another device. Refer to the REMOTE_LOGIN command
in Chapter 4 for details on accessing remote devices.
Connection through the RS-232 port means you can manage your Ethernet
Bridge Modules locally, from remote locations using modems and dial-up
telephone lines, and through LAN-based terminal servers.
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This version of the Bridge Module software also provides SNMP (Simple
Network Management Protocol), which allows the bridge to be managed
from a SNMP-based network management workstation.
The Bridge Module offers capabilities to help manage your extended LAN.
The primary categories of management functions are:
1. Bridge and Network Status Reporting
2. Network Statistic Collection and Reporting
3. Bridge Address Filter Settings
The reporting and other network management options are described in
detail in Chapters 3 and 4.
Media Configuration Options
The Bridge Module offers two connection alternatives:
❑ One AUI port connector (port 1) and one Backplane channel (port 2)
❑ Two Backplane channels (ports 1 and 2)
Message traffic flows between stations on LANs connected by the Bridge
Modules as if they were on one extended LAN. Since CSMA/CD (Carrier
Sense Multiple Access/Collision Detection) collision information does not
have to propagate between interconnected networks on an extended LAN,
you can configure each LAN up to the normal maximum length and
number of stations.
A sample configuration is shown in Figure 1-2.
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Figure 1-2. Sample Bridge Module Configuration
Caution: If your extended LAN includesprotocol-specific routers,
make sure the total number of routers in the extended
LAN does not exceed the maximum allowed by the
protocol for a single LAN.
AUI and Backplane Connections
When the bridging connections are made through the AUI port on the
front of the Bridge Module and over the backplane, the distance between
two end-node devices can be:
❑ 8000 meters for baseband (4000 meters from the backplane
connection and 400 meters from the AUI connection)
❑ 8000 meters for broadband (4000 meters on each side of the bridge)
An example of a thick-cable configuration is shown in Figure 1-3.
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Figure 1-3. Backplane Channel Bridged to Broadband Segment
Backplane Connections
When you bridge two channels using the backplane as both port 1 and
port 2, the maximum distance between two end-node devices can be 8000
meters (4000 m on each side of the bridge). This type of configuration is
shown in Figure 1-4.
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Figure 1-4. Backplane Channels Bridged Together
Diagnostics and Self-Test
On power-up, the Bridge Module performs the following diagnostic tests:
❑ Bridge self-tests
❑ CRC check of code memory (Flash EPROM)
❑ Port loopback tests
These tests allow the Bridge Module to check its own circuitry and
communication interfaces to verify its ability to send and receive data. If the
bridge fails any of the diagnostics, the front panel LEDs indicate an error
code. Power-up self-test and error codes are described in Chapter 5 and in
Appendix D. You can also diagnose local and remote bridges using the
management commands. These commands allow you to view bridge and
network information that is helpful in diagnosing network and bridge
problems. Chapter 4 provides a complete description of each Bridge
Module command.
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Installation
2
This chapter describes the precautionary, unpacking, and installation
procedures for the Bridge Module. It also provides illustrations of the
module and describes the front panel indicators, button, and connectors.
This chapter is divided into the following sections:
❑ Precautionary Procedures
❑ Unpacking Procedures
❑ Summarized Bridge Installation Procedure
❑ Installation Procedures
❑ Confirming Bridge Operation
This chapter provides examples of the commands necessary to initially
configure the Bridge Module. In the examples, user input is indicated as
lower-case underlined text.
Precautionary Procedures
Electrostatic discharge (ESD) can damage static-sensitive devices on circuit
boards. Follow these precautions when you handle the Bridge Module.
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❑ Do not remove the board from its anti-static shielding bag until you
are ready to inspect it.
❑ Handle the board by the faceplate only.
Use proper grounding techniques when you install the Bridge Module.
These techniques include using a foot strap and grounded mat or wearing
a grounded static-discharge wrist strap. An alternate method is to touch a
grounded rack or other source of ground just before handling the module.
Unpacking Procedures
Use the following procedure when unpacking your Bridge Module.
1. Verify that the Bridge Module is the correct model by matching the
model number listed on the side of the shipping carton to the model
number you ordered (5102B-EE).
Note that the product model number printed on the shipping box
differs from the model number on the product. The model number
on the shipping box contains the prefix ‘3C9’.
2. Remove the module in its anti-static shielding bag from the shipping
carton.
3. Remove the module from the anti-static shielding bag and inspect it
for damage. Always handle the Bridge Module by the faceplate,
being careful not to touch the components.
If the module appears to be damaged, replace it in the anti-static
shielding bag, return it to the shipping carton and contact your local
supplier.
3Com suggests you keep the shipping carton and anti-static shielding bag
in which your module was shipped in case you later want to repackage the
module for storage or shipment. Record the serial number of your Bridge
Module and other information specific to your modules in the Slot Usage
Chart in Appendix B of the ONline System Concentrator Installation and
Operation Guide.
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Summarized Bridge Installation Procedure
The following list summarizes the procedure for installing and operating
the Bridge Module.
❑ Plug the Bridge Module into the ONline System Concentrator with
the loopback connector attached to the AUI port and verify internal
diagnostics.
❑ Once the Bridge Module passes diagnostics, pull it back out of the
concentrator and set the dip switches to the two channels you want
to bridge (or set these values through network management without
removing the module).
❑ Plug the module back in the concentrator and the Bridge Module
performs self-test diagnostics. Upon completion of the diagnostics,
the unit begins learning the addresses of nodes on either side by
monitoring network traffic.
❑ Connect an ANSIterminal to the RS-232 port on the module faceplate
to configure SNMP values and any optional parameters.
❑ Monitor the extended LAN using the bridge management capabilities
through your connected terminal or via a modem or other interface
providing asynchronous serial communications.
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Module Front Panel
The front panel has eight indicators (LEDs), one button, two connectors,
and the module extractor. The front panel indicators inform you of the
operating state of your Bridge Module. Figure 2-1 shows the Bridge
Module front panel and Table 2-1 lists the function of each LED, button,
and connector on the module faceplate.
PORT 1
PORT 2
RX
TX
FWD
MGMT
TEST
Reset Button
RESET
Female AUI Port
AUI
RS-232 Serial Port
Module Extractor
RS-232
SERIAL
PORT
Figure 2-1. Bridge Module Front Panel
Refer to Appendix D for information on using and interpreting the Bridge
Module front panel controls and indicators.
Module Extractor
The module extractor is located at the bottom of the module faceplate.
Use the module extractor to remove the module from the concentrator.
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Just pull the extractor lever down to remove the module from the
concentrator.
Table 2-1. Bridge Module LEDs, Button, and Connectors
Label
Function
RX
Indicates receive activity on the IEEE802.3 or Ethernet
network connected to that port.
TX
Indicates transmit activity on the IEEE 802.3 or
Ethernet network connected to that port.
FWD
Indicates that the bridge is in forwarding state and is
sending packets from that port.
MGMT
Indicates that administrator mode of the bridge is
currently active.
TEST
Indicates Bridge Module self-test activity.
RESET
Press this button to reset the Bridge Module. Same as
issuing the RESET command or plugging in the
module.
AUI
Female AUI connector for 15-pin transceiver
connection.
RS-232 SERIAL RS-232 port for connecting terminal, terminal server,
PORT PC or modem for Management Interface.
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The Bridge Module has one dip switch component with 4 switches, located
on the larger of the two boards on the module. The switches on this dip
switch enable you to set the channels that are to be bridged together.
Figure 2-2 shows the location and factory settings of the dip switch on the
module.
RX
TX
SW1
FWD
ON
4
1
2
3
MGMT
OFF
TEST
1
3
4
2
Channel
1
2
Channel
RESET
On
On
1
2
On
On
Off
Off
On
Off
On
Off
On
Off
Off
Off
On
Off
2
3
AUI Port
Isolated
Isolated
AUI
PORT
PORT
1
Default Settings
RS-232
SERIAL
PORT
Backplane DIN
Connectors
Figure 2-2. Bridge Module and Dip Sw itch Location
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Channel-Select Sw itch Settings
All ONline media modules are equipped with the technology to work with
the ONline System Concentrator's unique TriChannel Architecture. This
architecture lets you assign the module to any of three channels on the
ONline System Concentrator backplane. Refer to Chapter 1 in the ONline
System Concentrator Installation and Operation Guide for a complete
discussion of ONline's TriChannel Architecture.
The channel-select switches on the Bridge Module enable you to assign the
module to bridge any two backplane channels, or to bridge one backplane
channel to the AUI port on the front of the module. Both channels must
be running Ethernet/IEEE 802.3.
Switch 1 is factory-set to the Off position and switches 2, 3, and 4 are
factory-set to the On position. Therefore, the Bridge Module is initially
configured to bridge the AUI port on the front of the module to backplane
channel 1. The default settings are highlighted in the Table 2-2. To
configure the module to bridge different channels, refer to the information
in Table 2-2.
Table 2-2. Channel Select Dip Sw itch Settings
Port 1
Sw itch 1 Sw itch 2
Port 2
Sw itch 3 Sw itch 4
Channel 1
Channel 2
AUI Port
Isolated
On
On
Off
Off
On
Off
On
Off
Channel 1
Channel 2
Channel 3
Isolated
On
On
Off
Off
On
Off
On
Off
If you have an ONline network management module installed in your
concentrator, you can remotely override these switch settings. Refer to the
appropriate ONline Management Module Installation and Operation Guide
for information on remotely managing the ports.
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Related Features
The following sections describe functions that allow you to:
❑ check the module's channel assignment and LED functionality
❑ remotely manage the Bridge Module from another device
LED and Channel Verification
The ONline Controller Module is equipped with an LED check button on the
front panel. The LED check button has two functions: it causes all LEDs in
all modules in the concentrator to light, and it causes each module to
identify the channel to which it is assigned. When you press this button,
the module initiates a test to all modules in the concentrator. Any LED that
does not light is defective.
After the five seconds elapse, the diagnostic continues with a channel
check of all modules. Each Port Status LEDs should respond by blinking the
number of times to correspond with the channel to which it is assigned.
The channel check sequence repeats five times. Table 2-3 explains the
channel check codes.
Table 2-3. Channel Check Codes
Port 1
LEDs
Port 2
LEDs
Port 1 Configuration
Port 2 Configuration
1 Blink
2 Blinks
4 Blinks
Off
Port is configured for 1 Blink
channel 1
Port is configured for
channel 1
Port is configured for 2 Blinks
channel 2
Port is configured for
channel 2
Port is configured to
the AUI connector
3 Blinks
Port is configured for
channel 3
Port is isolated
Off
Port is isolated
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Remote Netw ork Management
The ONline Ethernet Management Module (EMM) and ONline Token Ring
Management Module (TRMM) provide remote network management
capabilities for the ONline System Concentrator and its modules. These
management modules also have the ability to override the channel-select
dip switches on the Bridge Module. Refer to the appropriate ONline
Management Module Installation and Operation Guide for additional
information on network management features.
You can also log into the Bridge Module from a network management
module, from another Bridge Module, or from a Midnight Bridge. This type
of connection is called inband management. Once logged into this module
you are able to make changes and show statistics as if you were locally
connected to the module.
Installation Procedures
You do not need to power down the ONline System Concentrator to install
the Bridge Module. You can insert the module while the concentrator is
operating (this is called a hot insertion). The installation procedure is
divided into the following steps:
❑ Pre-installation test
❑ Connecting a terminal
❑ Connecting the transceiver cable
❑ Selecting bridge and channel settings
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Pre-Installation Test
When you install the Bridge Module into the concentrator, the unit
performs a self-test to verify proper operation of the internal hardware and
communication interfaces. To test the unit independently of network
activity, follow these steps prior to plugging the module into the
concentrator:
1. Install the provided Ethernet loopback connector to the AUI port on
the module as shown in Figure 2-3.
Figure 2-3. Connecting Loopback Connector
2. Remove two adjacent blank concentrator panels to expose two slots
for the Bridge Module.
3. Insert the module into the board guides at the top and bottom of the
slots and slide it into the concentrator. Make sure the connectors are
well seated into the backplane of the concentrator.
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Figure 2-4 shows the installation of the Bridge Module.
Figure 2-4. Installing the Bridge Module
4. Fasten the three spring-loaded screws on the front of the Bridge
Module faceplate to the concentrator with your fingers to provide
ground - do not overtighten.
As the Bridge Module performs its internal diagnostics, the Test LED on the
self-test. If the power-up self-test is successful, the Test LED goes off after
approximately 20 seconds and the module returnsto the configuration set
up by the dip switches and the TX LED will blink.
If none of the module faceplate LEDs light or if the Test LED blinks, refer to
Table 2-4 for appropriate action.
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Note: The loopback connector must be attached to the AUI port
or the self-test will not function properly.
Table 2-4. Pow er-Up Problem Resolution
Problem
Possible Solutions
All indicators are off
Verify that the concentrator is receiving
power.
Press the LED/Channel Check button on the
ONline Controller Module to check if the
LEDs light.
Pull the Bridge Module out using the
module extractor and re-insert it into the
concentrator.
The Test LED is blinking
Your unit failed the power-up self-test.
Write down the LED blink sequence
displayed on the front panel and refer to
Appendix D to identify the error code.
If you cannot correct the error at your site,
contact 3Com Customer Support as
explained in Appendix E.
If these alternatives fail to fix the problem, your unit is malfunctioning.
Repack it in the shipping carton and contact your 3Com representative for
corrective action.
5. Once the self-test is successful, remove the loopback connector and
continue with the installation procedure.
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Connecting a Terminal
You access Bridge Module management through the management
interface - the RS-232 port on the front of the module. You can connect
any device that presents an ASCII asynchronous interface, including
terminals, PCs capable of terminal emulation, and modems.
Note: If the concentrator has an installed network management
module, you can use the REMOTE_ LOGIN command to link
to the Bridge Module to perform bridge management.
Refer to the appropriate ONline Management Module
Installation and Operation Guide for information on remote
management.
For proper operation you need to make sure the terminal and Bridge
Module are communicating at the same baud rate before connecting
them. The Bridge Module has been factory-set to 9600 baud. You must
initially configure your terminal to a 9600 baud rate so it can communicate
with the module. Consult your terminal's user guide for instructions on
how to set its baud rate. In addition, you must configure the terminal's
parity, number of data bits, and stop bits to the Bridge Module factory
defaults as shown in Table 2-5.
Table 2-5. Bridge Module Default Terminal Settings
Parameter
Factory Setting
Baud
9600
8
Data_bits
Parity
None
2
Stop_bits
Flow Control
XON/XOFF
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Once you have configured your terminal to match the factory defaults of
the Bridge Module, you can connect a cable from the terminal to the
RS-232 port on the Bridge Module.
Connecting to the Bridge Module RS-232 Port
The RS-232 cable connects to the management interface on the Bridge
Module front panel. Table 2-6 defines generalcabling guidelines that apply
for connecting various devices to the management interface..
Table 2-6. RS-232 Cable Guidelines
Device
Cable
Terminal
Modem
Female-to-female crossover
Female-to-male crossover
Male-to-female straight-through
Refer to Supplier Documentation
Terminal Server
Note: The 3Com Firmware Distribution Kit (5000-FDK) providesa
cable for connection to a PC or terminal.
Appendix C describes the proper pinouts for male-to-female, crossover
RS-232 cable.
Connecting the Transceiver Cable
This section explains how to connect the transceiver cable to the AUI port
on the Bridge Module. If you do not intend to use the AUI port to connect
to a subnetwork, skip this section.
To install the transceiver cable, follow these steps while referring to
Figure 2-5:
1. Push the slide latch to the up position.
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2. Plug the transceiver cable into the jack.
3. Firmly push the slide latch down until it snaps into the locking
position.
4. Gently pull on the connector to make sure the latch is secure.
3Com recommends strain relief for this cable to avoid placing undue stress
on the connector.
AUI
RS-232
SERIAL
Figure 2-5. Connecting Transceiver Cable
Setting Bridge and Channel Parameters
Before selecting the channels that the module will bridge, verify that the
transceiver cable connection (if used) is secure at both ends of the cable
and that the transceiver is on a valid terminated segment. Then, follow the
steps below to complete the installation.
1. If you plan to manage the Bridge Module through an SNMP
workstation, you must set the following SNMP values: IP address,
Community Table, Default Gateway, Subnetwork Mask, and Alert
settings.
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2. Set the address filtering attributes (hard-coded addresses that are not
to be forwarded to, or that should always be forwarded to) using the
SET FILTER command. At this time you should also set any other
bridge settings that need to be changed before actually setting the
channels to bridge, such as Spanning Tree parameters.
3. The default setting is for the Bridge Module to configure the channels
from the dip switch settings at startup and when rebooted. If you set
the channelsthrough management (through a networkmanagement
module or from Bridge Module Management) you need to issue the
command as shown below to ensure that in the future, the Bridge
Module configures from the values in memory:
OEBM> set bridge dip_configuration disable [ENTER]
OEBM> save bridge [ENTER]
4. Select the channels that the module will bridge using one of the
three procedures explained below.
a. Using a terminal attached to the Bridge Module, issue the SET
BRIDGE CHANNEL command. For example, the commands SET
BRIDGE CHANNEL PORT1 1 and SET BRIDGE CHANNEL PORT2 2
will bridge channels 1 and 2 on the concentrator backplane.
Refer to Chapter 4 for a complete description of the SET BRIDGE
CHANNEL command.
b. Using a terminal attached to a network management module,
issue the SET PORT NETWORK command. For example, the
command below sets port 1 of a Bridge Module in slot 5 to
backplane network 1. Refer to the appropriate ONline
Management Module Installation and Operation Guide for a
complete description of the SET PORT NETWORK command.
EMM> set port 5.1 network ethernet_1 [ENTER]
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c. If you do not have a terminal connected to either the Bridge
Module or to a management module, slide the module out from
the concentrator (using the module extractor) and manually set
the dip switches on the board to bridge two channels. Refer to
Table 2-2 and Figure 2-2 in this chapter for an explanation of the
dip switch settings.
5. Verify that the bridge is working properly by viewing the TX and RX
LEDs. If there is traffic on the subnetworks, the transmit and receive
LEDs on the front panel will be blinking. If there appears to be a
problem, refer to Chapter 5, Troubleshooting.
Figure 2-6 shows an installed Bridge Module.
Bridge Module
Figure 2-6. Installed Bridge Module
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Confirming Bridge Operation
You confirm operation of the Bridge Module by sending packets between
two Ethernet or two IEEE 802.3 nodes on separate subnetworks. Here are
some suggested ways of doing this depending on your application:
❑ If your application uses MS-DOS networking software such as Digital
Equipment'sDECnet™-DOSorPCSA,Novell'sNetWare,or3Com's3+,
simply issue a DOS command when logged into your server directory.
❑ If your application accesses UNIX host computers using the TCP/IP
protocol, attempt to establish a terminal connection using the Telnet
protocol, or to transfer a file using the FTP protocol.
❑ If your application accesses DEC VAX™ hosts using LAT, attempt to
establish a terminal connection.
❑ Issue the PING diagnostic command to verify whether the Bridge
Module is active.
Follow the steps listed above to send packets acrossthe Bridge Module and
watch the front panel indicators to verify the packets are being transmitted
and received.
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ManagementFunctions
3
This chapter shows you how to get started once you have installed the
Bridge Module in your concentrator and also explains the management
capabilities of the Bridge Module.
You can use Bridge Management to:
❑ modify the configuration of your Bridge Module to suit your specific
application
❑ customize filtering attributes
❑ display information about the network and local or remote bridge
status
❑ display packet counters and network errors
❑ download new firmware to your Bridge Module (Chapter 6)
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Using Bridge Management
This section explains how to access Bridge Management, enter and edit
commands, get help, view, modify, and save parameters. This section also
describes how to display status information about your network and your
Bridge Module.
Note: Bridging software enables you to execute Management
commands regardless of bridging activity. Therefore,
bridging performance will be affected for the duration of
the command execution.
Connecting to the Management Interface
Refer to the section titled “Connecting a Terminal” in Chapter 2 for
instructions on connecting your terminal to the Management Interface
(RS-232 port).
Entering and Editing Commands
You manage the Bridge Module by entering commands at the
management prompt. The default management prompt is “OEBM>," but
can be customized. Use the keys described in Table 3-1 when entering
commands on the command line.
Caution: If the management prompt appears as “>>," it means
that the current Flash EPROM is faulty and that the
system is running off the Boot PROM (a subset of the
operational code). Type the HELP command for
information on the V1.3 command set. This command
set will keep your bridge operational, but with reduced
capabilities.
Contact 3Com Customer Support as outlined in Appendix E.
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Table 3-1. Command Line Key Functions
Key Function
[BS] or
[Backspace]
Moves the cursor back one character and deletes
that character.
[DEL] or [Delete] Same as Backspace.
[ENTER]
[SPACE]
Enters the command.
Completes a command through command
completion.
[CTRL-C]
[CTRL-R]
?
Returns to a blank command line (management
prompt) at any time.
Retypes the previous command string on the
command line.
Displays the available commands or command
options.
Command Completion
Bridge Management accepts abbreviated command input through a
feature called Command Completion. With Command Completion you
need only type the minimum number of letters required to distinguish the
command or argument from other acceptable choices and press the SPACE
bar to complete the command. An example of command completion is
shown below:
OEBM> sa
[SPACE]
After you press [SPACE], the command is completed as follows:
OEBM> save
If the letters you enter are not sufficient to determine a unique command,
Bridge Management waits for you to enter more characters. For example,
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entering the letter S followed by [SPACE] is not sufficient for Bridge
Management to determine which command you are issuing because there
are three commands that start with S - SAVE, SET, and SHOW.
Getting Help
The HELP command displays a screen of general information on using
Bridge Management. For example, type help at the command line, press
[ENTER], and the following screen of help information displays.
OEBM> help [ENTER]
Usage: help {command}
{command} :: Chipcom
|
*|
|
clear
help
logout
maintain
monitor
ping
|
*|
|
|
remote_login |
reset
revert
save
set
show
*|
*|
*|
*|
|
Help provides useful information to remind a knowledgeable
user of the meaning of commands. The commands with an
asterisk are administrator commands only.
If you press [ENTER] when an argument is expected, Bridge Management
prompts for additional information. You can type a question mark (?) in
response to any prompt to list acceptable commands, arguments, or
parameter values.
The Bridge Module management interface provides you with commands
that enable you to examine, modify, and save parameters. These
commands and their use are described next.
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Examining Parameters
The SHOW command lists the current value of any parameter you specify.
For example, the SHOW SPANTREE command displays the current spanning
tree parameters, as shown below.
OEBM> show spantree [ENTER]
Spanning Tree Parameters:
Mode
Enabled
Bridge Priority
Path Cost Port 1
Path Cost Port 2
Hello Time (sec)
0
10
10
2
Forward Delay Time (sec) 15
Listen Time (sec) 20
Spantree Hello Address: 01-80-C2-00-00-00
The SHOW DEVICE command displays the current device parameters and
values for the Bridge Module.
OEBM> show device [ENTER]
ONline Ethernet Bridge Module (OEBM); SNMP Management
Name: OEBM
Boot EPROM Version: v1.3
Flash EPROM Version: v2.0
Serial Number: 330658 Restarts: 7
Service Date: / /
Location:
3rd Floor Engineering
Port 1
Port 2
MAC Address:
IP address
08-00-8F-10-17-48
127.0.0.1
08-00-8F-10-17-49
127.0.0.1
Subnet Mask
FF.FF.FF.00
FF.FF.FF.00
Default Gateway 0.0.0.0 0.0.0.0
For assistance contact:
Network Administrator
Diagnostics: ENABLED
SQE Mode: NORMAL
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Modifying Parameters
Parameter values are stored in non-volatile memory on the Bridge Module.
Your Bridge Module unit is shipped from the factory with specific default
parameter values. Some of the default parameter settings are shown on
the previous page in the example explaining the SHOW DEVICE command.
Use the SET command to modify parameter values. You must first type the
administrator password when you log in to the management interface. The
administrator password provides access to commands that allow you to
modify the current bridge configuration.
Once you have entered the administrator password, you can change
parameter values using the SET command. Listed below is an example of
changing the Bridge Module terminal baud rate.
OEBM> set terminal baud 1200 [ENTER]
Terminal parameter changed
Once you have made all the parameter changes you want, you may want
to issue the SAVE ALL command and then logout of administrator mode to
prevent any unauthorized changes.
Saving Parameters
When you reboot the system, all parameters that can be set are reset to
their saved values. Therefore, to save the new parameter values you
changed and make them effective on the next reboot, you must issue the
SAVE command before rebooting. Use the SAVE command to save
parameter values for the following groups:
❑ All
❑ Alert
❑ Bridge
❑ Community
❑ Device
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❑ Filter
❑ Spantree
❑ Terminal
When you make configuration changes using the SET command, these
changes are effective immediately but are not saved permanently. You
must issue the SAVE command to keep the new configuration values. Only
saved values are in effect upon reset of the module or concentrator.
Note: If a power failure occurs within the concentrator, all
unsaved parameter values are lost.
Getting Started
This section briefly describes the steps to follow once the Bridge Module
has been installed in the ONline System Concentrator and a terminal has
been attached to its RS-232 port. Table 3-2 outlines these steps. The
following section, Bridge Management ParameterOverview, describeseach
step in detail.
Table 3-2. Procedures for Getting Started
Procedure
Command
Priority
1. Configure your
terminal to default
Bridge Module
communication
settings
Refer to your terminal
vendor's documentation
Mandatory
2. Configure the Bridge
Module
❑ Set administrator
SET DEVICE PASSWORD Mandatory
ADMINISTRATOR
password
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Table 3-2. Procedures for Getting Started (Continued)
Procedure
Command
Priority
❑ Set user passwords
SET DEVICE PASSWORD Recommended
USER
❑ Set the Bridge
Module:
SET DEVICE NAME
Recommended
SET TERMINAL PROMPT
SET DEVICE LOCATION
SET DEVICE CONTACT
Name, Management
Prompt, Location
Contact information
❑ Set Terminal Timeout
SET TERMINAL TIMEOUT Recommended
value
3. Configure Bridge
Module SNMP values:
❑ Set the Bridge Module: SET DEVICE IP_ADDRESS Mandatory if
IP Address,
SET COMMUNITY
SET DEVICE
DEFAULT_GATEWAY
SET DEVICE
SUBNET_MASK
SET ALERT
you plan to
manage via
SNMP or use
the PING
Community Table,
Default Gateway,
Subnetwork Mask,
and Alert Settings
command
4. Configure Spanning
Tree Parameters
SET SPANTREE...
Recommended
Mandatory
5. Save all configuration
values you set
SAVE ALL
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Bridge Management Parameter Overview
Bridge Management parameters fall into five general categories:
❑ Management Interface
❑ Remote Management
❑ Bridge Module Operation and Performance (Configuration)
❑ Filtering
❑ Statistics
The categories and specific parameters are discussed in the following
sections. All commands, arguments, and parameters are listed with
examples in Chapter 4.
Management Interface Parameters
The following three parameters control the configuration of the Bridge
Management Interface:
❑ Terminal Settings
❑ Prompt
❑ Password
Note that the new parameters you set are effective immediately; however,
you must use the SAVE command for the new parameters to remain
effective after a system reboot. Remember that you must first use the
administrator password to enable use of the SET command.
Configuring the Terminal
You must initially configure your terminal to the same parameter settings
as the Bridge Module so the terminal and the bridge can communicate.
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These parameterssettingsinclude the terminal'sbaud rate, data bits, parity,
and stop bits. For example, the BAUD parameter determines the baud rate
at which the RS-232 Bridge Management interface receives and transmits
data.
Note: If you need to set the module baud rate to a rate slower
than 9600 baud, use a terminal set to 9600 baud to first
change the value. Once you change the baud rate for the
module, the terminal loses the connection to the bridge
because it is now set to a different speed. You must reset
the terminal's baud rate to match the Bridge Module's new
module. You may then use the SAVE TERMINAL command
to save the new baud rate.
Your terminal settings must match the bridge factory default values as
shown in Table 3-3.
Table 3-3. Bridge Module Terminal Parameter Options and Factory
Defaults
Factory
Default
Parameter
Baud
Options
300, 1200, 2400, 4800, 9600
9600
Data_bits
Parity
7 or 8
8
odd, even, or none
1 or 2
none
2
Stop_bits
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Once you have configured your terminal to match the factory defaults of
the Bridge Module, press [ENTER] and the following header and password
prompt are displayed:
copyright 1992 Chipcom Corporation
ONline Bridge Module (v2.x)
Press [ENTER] and the Password prompt is displayed.
Password: [ENTER]
Initially the default password is a null string. You must enter a password
within 10 seconds of receiving the Password: prompt or the terminal will
display “Password timed out”. If this happens, just press [ENTER] to receive
the password prompt again. By pressing [ENTER] at the Password prompt,
the following greeting and the management prompt is displayed.
Welcome to system administrator services on ONline.
OEBM>
You are now logged in as the administrator with full access to all
commands.
Setting Bridge Module Terminal Options (Optional)
This section is optional and is only used if you need to connect another
device to an Bridge Module that runs at a slower baud rate or different
parity or data bits values than the factory settings. For example, if you plan
on connecting a 4800 baud modem to an Bridge Module so that you can
remotely manage the concentrator, you need to change the Bridge Module
factory default baud rate from 9600 to 4800.
Enter the following command to change the baud rate to 4800:
OEBM> set terminal baud 4800
[ENTER]
Once you change the baud rate (or parity or data bits values), you lose your
connection to the terminal immediately. Therefore, you must change the
corresponding value on the terminal and then press the [ENTER] key to
return to the OEBM> prompt and then SAVE the terminal settings.
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Note: Terminal values you set using the SET command are not
saved permanently until you issue the SAVE TERMINAL
command. Once the values are saved, if you log out or
even if the power fails, the saved values are retained.
Automatic Modem Hangup
If you use a modem to connect to the Bridge Module,you may want to use
the SET TERMINAL HANGUP command to hang up the modem connection
automatically when you log out of the Bridge Module. The factory default
is disable, which does not automatically hang up a modem. The following
example shows the command used to automatically hang up the modem
once you log out of the Bridge Module.
OEBM> set terminal hangup enable
[ENTER]
Note: If you fail to hang up the modem connection, an
unauthorized user may pick up the last login session.
Configuring the Bridge Module
Now that the terminal settings are complete, you can configure the Bridge
Module in the concentrator. We recommend that you complete the
following steps when you log in for the first time:
1. Establish passwords
2. Configure other Bridge Module parameters
3. Set Bridge Module SNMP values
Establishing Passw ords
Bridge Management provides a password-protection capability that allows
you to control access to certain commands and information. You must be
in administrator mode to be able to change passwords. Note that when
you first log in the default password is [ENTER]. This default password will
provide you with administrator privileges.
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Use the SET DEVICE command to modify passwords. Both the
administrator and the user passwords can contain up to 15 characters.
Alphanumeric and special characters are allowed, including [DEL] and [BS].
The Bridge Module has two levels of password control:
1. Administrator Password - the administrator password providesaccess
to all Bridge Module commands, enabling both read and write
configuration access.
2. User Password - the user password provides limited access to Bridge
Module commands, enabling read access only.
Typing the HELP command will list the bridge command set with
administrator commands designated by an asterisk (*) as shown earlier in
this chapter.
Note: For security, the characters you enter in both the old and
new password fields are not displayed on the screen.
The new passwords you set are in effect immediately, but you must use the
SAVE DEVICE (or SAVE ALL) command to save the new passwords
permanently.
Establishing the Administrator Passw ord
Use the SET DEVICE PASSWORD ADMINISTRATOR command at the
management prompt to establish the administrator password.
OEBM> set device password administrator
[ENTER]
Enter current administrator password: <current password> [ENTER]
New password: <new password> [ENTER]
Verify:
<new password> [ENTER]
Administrator password changed.
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Establishing the User Passw ord
Use the SET DEVICE PASSWORD USER command at the management
prompt to establish a user password. Note that you must be logged in as
the administrator to change the user password.
OEBM> set device password user
[ENTER]
Enter current administrator password: <current password> [ENTER]
New password:
Verify:
<new user password> [ENTER]
<new user password> [ENTER]
User password changed.
Configuring Other Bridge Module Parameters
The Bridge Module is factory set to certain default values that you may
need to change before using the Bridge Module, for example the Bridge
Module management prompt. If you are logged in as the administrator,
you can use the SET command to change or add the following Bridge
Module information:
❑ Bridge Module name (alias)
❑ Management prompt
❑ Contact name and location
❑ Terminal timeout value
❑ Concentrator Reboot Values
A full explanation of these values and how you set them is discussed in
Chapter 4 under the applicable SET command.
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Bridge Module Name (Alias)
To make communication with your remote Bridge Modules easier, we
recommend that you assign a unique name to each Bridge Module. You
can then use this name (instead of the IP address or Ethernet MAC address)
to reference the appropriate Bridge Module. In this manner you can log
into a remote Bridge Module by issuing the REMOTE_LOGINNAME <Bridge
Module Name> command. Use the SET DEVICE NAME command to assign
a unique name to your Bridge Module.
Bridge Module Management Prompt
You can customize the management prompt to a string of up to 15
characters long. The default management prompt is the string “OEBM> ”.
A new prompt could also include the angle bracket (>) and the trailing
space if desired.
Modify the management prompt by using the SET TERMINAL PROMPT
command as shown below.
OEBM> set terminal prompt Bridge_A> [ENTER]
Bridge_A>
3Com recommends that you set a unique management prompt for each
Bridge Module in the network. Doing so helps identify the specific Bridge
Module to which you are connected during remote management functions.
Refer to the REMOTE_LOGIN and LOGOUT commands and the Remote
Management section in this chapter for more information on remote
management.
Note: 3Com recommends that you set the prompt to the same
value as the Bridge Module name (alias).
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Contact Name and Location
You should enter the name of an appropriate service contact and the
concentrator location at this time to provide a handy reference should
there be a network problem. Use the SET DEVICE LOCATION and SET
DEVICE CONTACT commands to identify the location of the Bridge Module
and the name of the person responsible for the Bridge Module.
Terminal Timeout
You should set the terminal timeout value to specify the amount of time
your terminal will remain logged in without any keyboard activity. This
feature is useful for keeping unauthorized users off the system if you leave
your terminal without logging off. Once timeout has been set, the terminal
automatically logs you off the system if there is no keyboard activity for the
set period of time.
The default timeout value is 0, which means that no timeout has been set -
you will never be logged off automatically. Use the SET TERMINAL
TIMEOUT command to set the timeout period in minutes.
Concentrator Reboot Values
When the Bridge Module is reset (or rebooted) using the factory default
settings, the module performs a full diagnostic check and then sets all
parameters to the settings stored in its memory (except for channel
configuration if dip configuration is enabled). You have the option to
disable the diagnostics if you want the Bridge Module to boot up faster.
You also have the option to have the Bridge Module initialize its channel
configuration from memory (software settings) rather than its dip switch
settings.
Use the SET DEVICE DIAGNOSTICS DISABLE command to bypass the
diagnostics and the SET DEVICE DIP_CONFIGURATION DISABLE command
to force initialization of the Bridge Module channel configuration from its
memory settings.
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Setting SNMP Values
If you plan to manage the Bridge Module through an SNMP workstation
you must set the following attributes:
❑ IP Address
❑ Community Table
❑ Default Gateway
❑ Subnetwork Mask
❑ Alerts
IP Address
To manage via SNMP, every device on your network must have a unique IP
address. Use the SET DEVICE IP_ADDRESS command to assign unique IP
addresses to your Bridge Module ports. The following example shows the
command to assign an IP address to port 1 of the Bridge Module.
OEBM> set device ip_address_port1 195.24.25.36
[ENTER]
Community Table
The community table defines which SNMP stations on the network can
access and/or modify information from the Bridge Module, and which
station(s) will receive traps generated from the Bridge Module. Use the SET
COMMUNITY command to create a community table entry. For example,
the following command adds a community name of NCS with IP address
195.337.36.58 to have read_write access:
OEBM> set community NCS 195.337.36.58 read_write
[ENTER]
You can use the SHOW COMMUNITY command to view the existing
community entries.
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Default Gatew ay
The default gateway is the IP address of the gateway that will receive and
forward packets whose addresses are unknown to the local network. The
default gateway is useful when sending Bridge Module alert packets to a
manager workstation that is on a different network. For example, the
following command specifies the gateway with the address 195.24.25.36
to be used as the default gateway for port 2 of the Bridge Module.
OEBM> set device default_gateway_port2 195.24.25.36
[ENTER]
Subnetw ork Mask
The subnetwork mask is specific for each type of Internet class. In general,
the subnetwork maskis a 32-bit IP address with all ones (1) in the network
and subnetwork portions of the address and zeroes (0) in the host portion.
The subnetwork maskis input as four pairs of hexadecimal d igits separated
by periods to represent the 32-bit binary address. For example, to set the
subnetwork mask for a class C network you would enter the following
command.
OEBM> set device subnet_mask_port1 FF.FF.FF.0
[ENTER]
The subnetwork mask for a class B network would be set using the
following command.
OEBM> set device subnet_mask_port1 FF.FF.0.0
[ENTER]
Alert Settings
The SET ALERT command is used to enable or disable sending alerts to the
SNMP management workstation. Refer to the SET ALERT command for
information on the different types of alerts you can set. For example, the
following command enables sending an alert when a configuration change
is made to the concentrator or Spanning Tree topology change is detected.
OEBM> set alert change enable [ENTER]
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Remote Management
Remote Management is used to set and view parameter values for a
remote Bridge Module, Midnight Bridge, or network management module.
Once you are connected to a local bridge, you initiate remote management
by issuing the REMOTE_LOGIN command, naming the remote device or IP
address to which you want to connect, and specifying port 1 or port 2.
Note that issuing the REMOTE LOGIN command will affect bridging
performance for the duration of the remote connection.
Once you are connected to a remote bridge, the management prompt you
created for that bridge is displayed on your monitor. Therefore, each Bridge
Module management prompt should be unique and reference the bridge
name to remind you that you are connected to a remote bridge. Any
parameter changes you make and any display type commands you issue
when connected to the remote bridge are performedon the remote Bridge
Module.
Disconnect from the remote Bridge Module by issuing the LOGOUT
command.
Bridge Module Operation and Performance (Configuration)
Several bridge parameters affect the performance and operation of the
Bridge Module. These parameters can be set during initial setup and can
also be changed later during normal operation of the bridge using the
management commands. The parameters in this category include:
❑ AGEING_TIME
❑ SPANTREE
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AGEING_TIME
The AGEING_TIME parameter tells the Bridge Module when to “age out”
(automatically remove) addresses from the dynamic filtering table (default
ageing period is 5 minutes). Once you set this value, the bridge will remove
addresses from the table when the node with the specific address fails to
transmit for the age period. For example, the command below would age
out an address once it was inactive for 17 minutes.
OEBM> set ageing_time 17 [ENTER]
Note that this command has no effect on addresses in the static address
table filter table.
Spantree
The SET SPANTREE command controls all of the Spanning Tree
configuration settings. These settings include:
–
–
–
–
–
bridge priority
forward delay time
hello and listen times
mode
the path cost for each port
Refer to the SET SPANTREE section in Chapter 4 for more information on
the SPANTREE command. Refer to Appendix B for information on the
Spanning Tree Algorithm and Protocol.
Filtering Parameters
Filtering is an important capability of the Bridge Module because it allows
particular nodesto be isolated on different subnetworks. This feature keeps
heavy traffic on one subnetwork from slowing down the entire network.
There are two filtering tables that the bridge uses: the dynamic filter table
and the static address filter table. The dynamic filter table is generated
automatically by the bridge as explained below and the static address filter
table is built using the SET FILTER command.
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When attached to a subnetwork, the Bridge Module dynamically learnsthe
addresses of the nodes on the subnetwork. The Bridge Module looks at the
source address of each packet generated on the subnetwork and creates
the dynamic filter table from these addresses.
When a packet is received by the Bridge Module, its destination address is
compared to the addresses in the dynamic filter table. If the destination
address is found in the dynamic filter table, the packet is determined to be
local and the Bridge Module does not forward the packet to the other
subnetwork. If the address is not in the dynamic filter table, the packet
destination is assumed to be on a different subnetwork (or the destination
node has not generated any traffic) and the bridge forwards the packet
accordingly. (Use the SHOW FILTER DYNAMIC_ADDRESS_TABLE command
to list all dynamic addresses known by each port.)
Static Address Filter Table
The SET, CLEAR, and SHOW commands allow you to establish, remove, and
display permanent filtering attributes for specific nodes. TheSET command
establishes a permanent entry in the static address filter table: an entry
which is never “aged out." This can improve network performance by
controlling the flow of packets based on your specific network topology
and traffic patterns.
For example, the following command tells the Bridge Module to never
forward packetsto destination address 0800-8F00-0123 on port 2 from any
node connected to port 1.
OEBM> set filter static_address_table never_forward_to_port2
0800-8f00-0123 [ENTER]
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Statistics Parameters
Bridge Management statistics provide useful information regarding traffic
loading and error conditions. The following commands are used to display,
monitor, and clear statistics:
❑ SHOW
❑ MONITOR
❑ CLEAR
These commandsare discussed brieflyin the following paragraphs. Chapter
4 provides complete description and examples of these commands.
SHOW
The SHOW command displays current bridge attributes. You must use one
of the SHOW command parameters to display bridge attributes. Several of
the SHOW command parameters have parameters of their own.
Refer to SHOW command section in Chapter 4 for descriptions of all of the
SHOW command parameters.
MONITOR
The MONITOR command enables you to periodically display network
statistics for the bridge ports based upon the monitor rate that you
request. This command offers four options that display screens of statistics
similar to the SHOW command option screens.
The MONITOR command option screens are updated (based upon the
requested time) to show changes to the bridge as they occur. You may
want to use this command to keep a continuous display as to the status of
your Bridge Module and network once setup is complete.
Press the [CTRL-C] to discontinue the current MONITOR command and
return to the management prompt.
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The MONITOR command will, by default, monitor the bridge statistics and
use a time value of 5 minutes if you press [ENTER] instead of inputting a
time and an option in the command line.
Note that when executing the MONITOR command, bridging performance
will be affected for the duration of the command. To minimize this impact,
use the default value.
CLEAR
The CLEAR command resets statistics and fatal-error registers associated
with the SHOW and MONITOR commands to zero. The CLEAR command
has four parameters: community, counter, filter, and last_error. The
community, counter, and filter parameters also have parameters of their
own.
Logging Out
When you are done using the Bridge Module, SAVE all your changes and
then log out to prevent unauthorized use of the module. You log out of the
system using the LOGOUT command as shown below. If you have not
made any unsaved changes prior to issuing this command, you will be
logged out of the system and the following message will display:
OEBM> logout
Bye
[ENTER]
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If you have made changes and you have not saved these changes, LOGOUT
prompts you as follows:
OEBM> logout
[ENTER]
WARNING: Save unsaved changes before logout.
OEBM>
You must either SAVE or REVERT the changes you made to the system
before you will be able to log out of the system.
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Management
Commands
4
This chapter provides a complete alphabetized listing of the ONline
Ethernet Bridge Module commands. Each command description includes
examples of command usage and their results. Table 4-1, beginning on
page 4-3, is a reference chart of the commands, their parameters, and the
page where they can be found.
Note that the Bridge Module software enables you to execute
Management commands regardless of bridging activity. Therefore,
bridging performance will be affected for the duration of the command
execution.
Conventions
The following conventionsare used in the command descriptionscontained
in this chapter:
The management prompt is indicated as “OEBM>.”
User input is indicated as lower-case underlined text. For example, show
deviceor set terminal baud.
Responses from the Bridge Module appear as they do on your terminal
screen.
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A variable that requires specific user input is indicated by lower case text
surrounded by curly brackets. For example, {new password}. When you
type in the variable, do not include the angle brackets as part of the
variable string .
[ENTER] refers to a carriage return.
Typing a '?' at the end of a command line will list the possible
completions for that command and then redisplay the command line. If
you type a '?' after the last parameter setting for a command, the prompt
“Confirm with a carriage return” is displayed.
If a command line is incomplete and you do not type a '?' to list possible
completions for that command, you will be prompted to enter the next
required parameter.
Note that when setting parameters, you must supply a variable or value for
that parameter, if required. Only the PING and the MONITOR commands
allow a carriage return to insert a default value. Refer to these individual
commands in this chapter for their default values.
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Command Summary
Table 4-1 displays a summary of Bridge Module commands, their
parameters, and the page number where they are located in this chapter.
Statistics, Maintenance, and Special.
It is important to note that there are specific Bridge Module commands
that must be used with caution. If used improperly, these commands have
the potential to disrupt the network. These commands are marked in
Table 4-1 with an asterisk (*). Read the command descriptions carefully
before executing any of these commands.
Table 4-1. Bridge Module Command Index
Command Type
Command
Parameters
Page
General
?
{Bridge command} ?
{Bridge command}
none
4 - 9
4 - 19
4 - 22
HELP
LOGOUT
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Table 4-1. Bridge Module Command Index (Continued)
Command Type
Command
CLEAR
Parameters
community
Page
Configuration
4 - 12
4 - 13
4 - 14
4 - 15
4 - 33
4 - 33
4 - 33
4 - 33
4 - 33
4 - 33
4 - 33
4 - 33
4 - 35
4 - 35
4 - 35
4 - 35
4 - 35
4 - 35
4 - 35
4 - 35
4 - 38
counter
filter
last_error
alert
REVERT
all *
bridge *
community *
device *
filter *
spantree *
terminal
alert
SAVE
all
bridge
community
device
filter
spantree
terminal
authentication
SET ALERT
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Table 4-1. Bridge Module Command Index (Continued)
Command Type
Command
Parameters
change
Page
Configuration
4 - 38
4 - 38
4 - 41
4 - 42
4 - 43
4 - 44
4 - 46
(continued)
hello
SET BRIDGE
ageing_time
channel *
dip_configuration
side_switch_mode
SETCOMMUNITY community name
ip_ address
access (all are required)
SET DEVICE
contact
4 - 50
default_gateway_port1 4 - 51
default_gateway_port2 4 - 52
diagnostics
4 - 53
4 - 54
4 - 55
4 - 56
4 - 57
4 - 58
4 - 60
4 - 61
4 - 62
ip_address_port1 *
ip_address_port2 *
location
name
password
sqe_mode
subnet_mask_port1
subnet_mask_port2
SET FILTER
mode protocol_id_table 4 - 64
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Table 4-1. Bridge Module Command Index (Continued)
Command Type
Command
Parameters
Page
Configuration
(continued)
SET FILTER (cont.) protocol_id_table
static_address_table
4 - 66
4 - 67
4 - 70
4 - 71
4 - 73
4 - 75
4 - 77
4 - 79
4 - 80
4 - 81
4 - 83
4 - 85
4 - 86
4 - 87
4 - 88
4 - 89
4 - 90
4 - 93
4 - 94
4 - 96
SET SPANTREE*
bridge_priority *
forward_delay_time *
hello_address *
hello_time *
listen_time *
mode *
path_cost_port1 *
path_cost_port2 *
baud
SET TERMINAL
data_bits
hangup
parity
prompt
stop_bits
timeout
Status
SHOW ALERT
SHOW BRIDGE
none
none
SHOW
none
COMMUNITY
SHOW COUNTER bridge
4 - 98
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Table 4-1. Bridge Module Command Index (Continued)
Command Type
Command
Parameters
Page
Status
(continued)
SHOWCOUNTER ports
(cont.)
4 -
100
protocols
4 -
104
spantree
none
4 -
106
SHOW DEVICE
SHOW FILTER
4 -
108
dynamic_address_table 4-111
mode
4-112
4-113
4-114
4-115
protocol_id_table
static_address_table
none
SHOW
LAST_ERROR
SHOW SPANTREE none
4 -
116
SHOW TERMINAL none
4-119
4 - 25
4 - 25
4 - 25
4 - 25
Statistics
MONITOR
(mm:ss)
bridge
ports
protocols
spantree
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Table 4-1. Bridge Module Command Index (Continued)
Command Type
Command
MAINTAIN
Parameters
Page
Maintenance
download out_of_band 4 - 23
PING
ip_address
name
4 - 28
4 - 28
4 - 32
4 - 16
4 - 30
4 - 30
4 - 30
RESET DEVICE
none
Special
FORCE
none
REMOTE_LOGIN
ip_address
mac_address
name
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?
Use the ? command to list the available Bridge Module command choices
and parameter options.
Format
?
{command} ?
Parameters
none
Example
The following command displays the list of Bridge Module commands
available under the administrator password. Note that the ? character
does not display on the screen when typed, but is shown in the examples
for clarity.
OEBM> ? [ENTER]
Possible completions:
clear
help
logout
maintain
monitor
ping
remote_login
reset
revert
save
set
show
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Example
The following command displays the list of Bridge Module commands
available under the user password. Note that the ? character does not
display on the screen when typed, but is shown in the examples for clarity.
OEBM> ? [ENTER]
Possible completions:
help
logout
monitor
ping
remote_login
show
Example
As shown below, you can use the ? command to view the available
parameters for a command, as illustrated for the SAVE command.
OEBM> save ? [ENTER]
Possible completions:
all
alert
bridge
community
device
filter
spantree
terminal
Description
As presented in the examples, the ? command is used to list the available
Bridge Module command choices. In addition, it can be used as part of a
command line to display a list of the possible completions for a specific
command.
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CLEAR COMMUNITY
Use the CLEAR COMMUNITY command to clear an entry from the
community table. This command is only available in administrator mode.
Format
CLEAR COMMUNITY {community number}
Parameters
{community number} = 1 - 10 or all
Example
OEBM> clear community 3 [ENTER]
Community 3 cleared
Description
The CLEAR COMMUNITY command enables you to clear an entry in the
community table.
It is recommended that you use the CLEAR COMMUNITY command in
conjunction with the SHOW COMMUNITY command to view the
community table before you clear an entry from it.
The community table defines which SNMP stations on the network can
access information from the Bridge Module and which station(s) will
receive a trap generated from the Bridge Module.
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CLEAR COUNTER
Use the CLEAR COUNTER command to clear all counters or a specific
statistical counter. This command is only available in administrator mode.
Format
CLEAR COUNTER {counter type}
Parameters
{counter type} = all
bridge
ports
protocols
spantree
Example
OEBM> clear counter bridge [ENTER]
Done
Description
The CLEAR COUNTER command enables you to clear all counters or a
specific statistical counter.
It is recommended that you use the CLEAR COUNTER command in
conjunction with the SHOW COUNTER command to view statistics before
you clear them.
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CLEAR FILTER
Use the CLEAR FILTER command to clear an entryfrom the protocol id table
or the static address table. This command is only available in administrator
mode.
Format
CLEAR FILTER {parameter} {variable}
Parameters
{parameter} = protocol_id_table {protocol type}
static_address_table {MAC address}
Example
OEBM> clear filter protocol_id_table 0800
[ENTER]
Protocol ID deleted from filter table.
Do SAVE FILTER and RESET DEVICE to use changes.
Example
OEBM> clear filter static_address_table 03-00-06-07-17-01 [ENTER]
Address deleted from filter table.
Do SAVE FILTER and RESET DEVICE to use changes.
Description
The CLEAR FILTER command enables you to clear entries from the static
address table and the protocol id table.
It is recommended that you use the CLEAR FILTER command in conjunction
with the SHOW FILTER command to view filter table entries before you
clear them.
You must issue the SAVE FILTER and RESET DEVICE commands after
modifying the tables for the changes to take effect.
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CLEAR LAST_ERROR
Use the CLEAR LAST_ERROR command to clear the file that contains
information on the last fatal error that occurred at the Bridge Module. This
command is only available in administrator mode.
Format
CLEAR LAST_ERROR
Parameters
none
Example
OEBM> clear last_error [ENTER]
Last fatal error cleared
Description
The CLEAR LAST_ERROR command clears the file that contains information
on the last fatal error that occurred at the Bridge Module.
Use the CLEAR LAST_ERROR command in conjunction with the SHOW
LAST_ERROR command to view a fatal error before you clear it.
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FORCE
Use the FORCE command to override the current Bridge Module
administrator password. It should only be used in the case when the
password was illegally changed or forgotten. The FORCE command can
only be entered at the login prompt.
Format
FORCE
Parameters
none
Description
The FORCE command enables you to force the administrator password
back to its factory default (carriage return). This command can only be
used at the login password prompt.
The FORCE command requires that you provide answers to two prompts
about the LED sequence displayed on the front panel of the module before
you can reset the administrator password - requiring you to be physically
located at the concentrator where the module is installed.
To revert the current administrator password to its factory default (carriage
return), you must interpret 2 hex digits from two consecutive LED displays
at the Bridge Module front panel and enter these values at the login
prompt. You have 30 seconds in which to enter the hex digits for each
display.
When you respond to both prompts within their 30 second time limits and
provide the correct interpretation of the displayed LED sequences, the
Bridge Module displays the message “Access Accepted” and performs a
reset. At the subsequent Password: prompt, press the ENTER key to access
administrator mode on the bridge. You may then use the SET DEVICE
PASSWORD ADMINISTRATOR command to establish a new administrator
password.
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If either response to the LED interpretation prompts is incorrect or you
exceed the 30 second time limit, the bridge displays the message “Access
Denied” and performs a reset with the current administrator password
retained. You will then need to repeat the FORCE command to retry the
LED interpretation.
Example
To successfully interpret the eight LED display, you must read the LEDs from
1 - 8 (refer to the illustration in the FORCE command example) with LED 1
representing the most significant (left-most) binary digit and LED 8
representing the least significant (right-most) binary digit. A solidly lit LED
is translated into a 1 and an unlit LED is translated into a 0.
The 2-digit hexadecimal number represented by these eight binary digits
must then be entered as the response to the bridge prompt. If you
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successfully interpret the first LED pattern, a second pattern is displayed
which you must also interpret. If you successfully interpret the second
pattern, the bridge will reboot. At the Password: prompt you will be able
to press carriage return to access administrator mode of the bridge.
As an example, the front panel LED sequence for the first illustration on the
previouspagetranslatesinto01011111,whichis5finhexadecimalnotation.
Likewise, the LED sequence for the second illustration translates into
01101100, which is 6c in hexadecimal notation.
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HELP
Use the HELP command to get information concerning the meaning of the
commands.
The HELP ? command will display a list of possible completions for the HELP
command. When in user mode, this list will only contain the possible
completions that a user may enter. When in administrator mode, this list
will contain all possible command completions.
Format
HELP {command}
Parameters
{command} = Chipcom
clear
help
logout
maintain
monitor
ping
remote_login
reset
revert
save
set
show
Example
OEBM> help [ENTER]
Usage: help {command}
{command}
Chipcom
clear *
help
logout
maintain *
monitor
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ping
remote_login
reset *
revert *
save *
set *
show
Help provides useful information to remind a knowledgeable
user of the meaning of the commands. The commands with an
asterisk are administrator commands only.
Example
OEBM> help Chipcom [ENTER]
Southborough Office Park
118 Turnpike Road
Southborough, MA 01772-1886
To call Chipcom Customer Support in the United States, call
800-228-6840 between the hours of 8:30 am and 5:00 pm, Eastern
Time. Outside of the United States, call 508-460-8900 and ask
for extension 4340 or Tech Support.
Description
In addition to the HELP command functions described in the examples, the
Bridge Module provides two additional features to assist you in selecting
commands and arguments: command completion and the completion list.
Command Completion
Command completion eliminates the need to type the entire command or
argument name. Pressing the SPACE bar after partially typing the
command fills in the remainder of the command name. You must type
enough letters for command completion to distinguish the command.
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Completion List
A completion list displays a list of available choices with which to complete
a command line. A completion list is obtainable at any point by typing “?.”
For example, when you type SET ?, the following completion list is
displayed:
OEBM> set ? [ENTER]
Possible Completions:
alert
bridge
community
device
spantree
terminal
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LOGOUT
Use the LOGOUT command to end a local or remote login session.
Format
LOGOUT
Parameters
none
Example
Logging out from a local Bridge Module:
OEBM> logout
Bye
[ENTER]
Description
If you are logged into the local Bridge Module (the Bridge Module to which
the terminal is connected), issuing the LOGOUT command ends the session.
If you are logged into a remote Bridge Module or other device (e.g.,
Midnight Bridge) and issue the LOGOUT command, the terminal session
with the remote device is broken and resumed with the local Bridge
Module.
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MAINTAIN
Use the MAINTAIN command to enter maintenance mode. Maintenance
mode allows you to download new software to the Bridge Module through
the DOWNLOAD command. This command is only available in
administrator mode.
Format
MAINTAIN {parameter}
Parameter
{parameter} = download out_of_band
Example
OEBM> maintain download out_of_band [ENTER]
If you are sure you want to perform a download, you must enter the
DOWNLOADcommand again within 10 seconds.Otherwise, the download
sequence will be aborted. You will then have to reenter the Download
command to restart the process.
For a quick command reentry, press the [CTRL-R] sequence, which will
retype the previous command string on the command line.
The system will prompt you twice for the password (carriage return). To
perform the download, type [ENTER] at the password prompts as shown.
Please enter your password to begin the download procedure:
Password: [ENTER]
Please enter your password again
Password: [ENTER]
Preparing the bridge for download...
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Description
The MAINTAIN DOWNLOAD OUT_OF_BAND command enables you to
download new software to the Bridge Module via the terminal port. Note
that you cannot enter the MAINTAIN command if you are connected to a
remote Bridge Module through the REMOTE_LOGIN command.
The DOWNLOAD command will erase your current operational code. You
will need the following items to replace the software:
1. 3Com Firmware Distribution Kit (part number 5000-FDK)
2. ONline Ethernet Bridge Module Update Distribution Kit
(part number 5102B-UDKU-x.x or 5102B-UDKL-x.x)
Refer to Chapter 6 for a complete explanation of the download process.
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MONITOR
Use the MONITOR command to periodically display statistical information.
The statistics are reported periodically based upon the time that you
request.
The MONITOR command parameter displays are the same as the SHOW
command parameter displays, except that the MONITOR displays are
updated based upon the time you request. Refer to the SHOW command
section for explanations of the displays.
Note that while executing the MONITOR command, bridging performance
will be affected for the duration of the command. It is recommended that
you execute the MONITOR command for the default time period of five
minutes or longer to minimize this impact.
Format
MONITOR {interval} {group}
Parameters
{interval} = 0:05 - 30:00 (default is 5:00)
{group} = bridge (default)
ports
protocols
spantree
Example
This example displays Spanning Tree statistics every thirty seconds.
OEBM> monitor 0:30 spantree
[ENTER]
Port 1
FORWARDING FORWARDING
145 Seconds Since Clear
Spanning Tree State
Port 2
Spanning Tree Frames Received
Spanning Tree Frames Transmitted 0
0
0
0
Port Independent Statistics
Topology Change Count
2
Seconds Since Topology Changed 114
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Active Hello Time
Active Forward Delay
Active Listen Time
2
15
20
Press CTRL-C to exit.
Example
This example displays protocol statistics every 30 seconds.
OEBM> monitor 0:30 protocols
[ENTER]
3658 Seconds Since Clear
Unicast Packets Received
Non-Unicast Packets Received
Unicast Packets Transmitted
Port 1
Port 2
0
0
0
0
0
0
0
Non-Unicast Packets Transmitted 0
Press CTRL-C to exit.
Description
The MONITOR command periodically displays the network and bridging
statistics for the channels to which the bridge is connected based on the
number of minutes and seconds you assign.
The {interval} value can be a maximum of 30:00 minutes and a minimum
of 0:05 seconds and is entered in the format mm:ss (e.g., 0:20 or 7:00).
The default is 5 minutes. The default parameter to be monitored is bridge
statistics.
Press the [CTRL-C] key combination to discontinue the statistics display and
return to the management prompt.
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PING
Use the PING command to verify whether a device is active.
Note that while executing the PING command, bridging performance will
be affected for the duration of the command.
Format
PING {device name} {number of packets}
Parameters
{device name} = ip_address {Internet Protocol address}
name {name of the device}
{number of packets} = 1 - 255 (default is 1 packet)
Example
Verify whether the device with the IP address (Internet Protocol address)
1.2.3.4 is active by having it echo two return packets:
OEBM> ping ip_address 1.2.3.4 2 [ENTER]
Starting ping ...
Ping completed with 2 packets received
Example
Verify whether the device with the name G421 is active by having it echo 10
return packets:
OEBM> ping name G421 10 [ENTER]
Starting ping ...
Ping completed with 10 packets received
Description
This command sends {n} number of ICMP (Internet Control Message
Protocol) packets to the specified device and requests that the device send
back the exact number of packets sent in the request (the default is 1
packet).
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REMOTE_LOGIN
Use the REMOTE_LOGIN command to log into any remote Bridge Module
or other manageable 3Com device on the network and manage it from the
local terminal.
Note that while executing the REMOTE_LOGIN command, bridging
performance will be affected for the duration of the command.
Format
REMOTE_LOGIN {device name} {variable} {port}
Parameters
{device name} = ip_address {Internet Protocol address}
mac_address {Ethernet address}
name {remote device name}
{port} = port1
port2
Example
Log into the device with the IP address 1.2.3.4, which is on the port 1 side
of the local Bridge Module:
OEBM> remote_login ip_address 1.2.3.4 port1 [ENTER]
Example
Log into the device with the MAC address09-00-8F-00-00-10, which is on
the port 2 side of the local Bridge Module:
OEBM> remote_login mac_address 09-00-8F-00-00-10 port2 [ENTER]
Example
Log into the device with the name G421, which is on the port 1 side of the
local Bridge Module:
OEBM> remote_login name G421 port1 [ENTER]
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Description
Use the REMOTE_LOGIN command and the address or name of the remote
Bridge Module (or other manageable 3Com device) to which you want to
connect. You must be connected, via a terminal, to a local Bridge Module
before you can issue this command.
Once you are connected to the remote device, you must enter the correct
password for that device. From that point on, all the commands you issue
are for that device. Therefore, if you remotely log into a Midnight Bridge
unit, you must use the Midnight Bridge command set to perform desired
functions.
Use the LOGOUT command to end the session with the remote device and
return to the local Bridge Module.
Note: You can only connect to one remote device at a time. If
you wish to log into another device, you must log out of
the first (returning to the local Bridge Module) and then log
into the other device.
If you are having trouble logging into a remote device, make sure the
device is connected to one of the bridge ports.
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RESET DEVICE
Use the RESET DEVICE command to reset the Bridge Module. This
command is only available in administrator mode.
Format
RESET DEVICE
Parameters
none
Example
OEBM> reset device [ENTER]
Resetting device
Description
The RESET DEVICE command resets the Bridge Module. The setting for the
diagnostics parameter determines whether diagnostics will execute during
a reset. Use the SHOW DEVICE command to display the diagnostic
parameter setting. Use the SET DEVICE DIAGNOSTIC command to enable
or disable diagnostics.
Enabling diagnostics results in the diagnostics executing during a reset (i.e.,
a cold boot). Disabling diagnostics results in no diagnostics being executed
during a reset (i.e., a soft boot).
The RESET DEVICE command has the same effect as pressing the Reset
button on the bridge front panel.
When you reset the Bridge Module, traffic forwarding is brieflyinterrupted.
You must log back in to the bridge once the reset is complete to execute
additional commands.
Note that you must SAVE or REVERT unsaved changes before this
command will execute.
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REVERT
Use the REVERT command to return to the configuration settings that were
in effect as of the last save.
This command is only available in administrator mode.
Format
REVERT {group}
Parameters
{group} = alert
all
bridge
community
device
filter
spantree
terminal
Example
OEBM> revert alert
[ENTER]
Reverting alert configuration
Example
OEBM> revert all [ENTER]
Reverting alert configuration
Reverting bridge configuration
Reverting community configuration
Reverting device configuration
Reverting filter configuration
Reverting spantree configuration
Reverting terminal configuration
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Description
The REVERT command allows you to return to the last configuration value
settings saved. For example, if you specify REVERT ALERT, any SET ALERT
changes you made (after the last SAVE ALERT) are cancelled. In addition,
REVERT ALERT only affects the ALERT parameter - all other groups are
unchanged. Values affected by this command are those associated with the
SET ALERT command.
As a result of issuing the REVERT ALL command, previous configuration
values saved for Alert, Bridge, Community, Device, Filter, Spantree, and
Terminal will be restored.
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SAVE
Use the SAVE command to save the current configuration values
established by the SET command. These configurations are saved in
non-volatile EEPROM memory.
This command is only available in administrator mode.
Format
SAVE {group}
Parameters
{group} = alert
all
bridge
community
device
filter
spantree
terminal
Example
OEBM> save alert [ENTER]
Saving alert configuration
Example
OEBM> save all [ENTER]
Saving alert configuration
Saving bridge configuration
Saving community configuration
Saving device configuration
Saving filter configuration
Saving spantree configuration
Saving terminal configuration
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Description
Parameter values established by the SET command are effective
immediately but are not automatically saved. Use the SAVE command to
permanently save these values. Only saved values are in effect upon reset.
Issuing the SAVE ALL command saves all of the latest bridge configuration
values established by the SET command for Alert, Bridge, Community,
Device, Filter, Spantree, and Terminal parameters.
The SAVE ALERT, SAVE BRIDGE, SAVE COMMUNITY, SAVE DEVICE, SAVE
FILTER, SAVE SPANTREE, and SAVE TERMINAL commands allow you to save
the values set for the specific category without saving the other category
settings.
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SET
Use the SET command to change alert, bridge, community, device,
spantree, and terminal attributes. The SET command requires a parameter
to set specific attributes. This command is only available in administrator
mode.
Format
SET {parameter}
Parameters
{parameter} = alert
bridge
community
device
spantree
terminal
Description
The SET command enables you to change attributes for the alert, bridge,
community, device, spantree, and terminal parameters.
To save changes in EEPROM memory, use the SAVE command. To return to
the previously saved values, use the REVERT command.
The SET command parameters have parameters of their own. The
following pages describe these parameters in detail.
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SET ALERT
Use the SET ALERT command to enable or disable the notification of an
alert statement (trap) from this Bridge Module to the designated trap
receiver (SNMP workstation).
Format
SET ALERT {alert type} {setting}
Parameters
{alert type} = authentication
change
hello
{setting} = enable
disable (default for all alert types)
Example
The following is an example of disabling the Hello alert, normally generated
when a new Bridge Module is installed in the concentrator or when an
existing Bridge Module is reset.
OEBM> set alert hello enable
Alert HELLO set to ENABLE
[ENTER]
Example
The following is an example of enabling the Change alert for any
configuration change made to the Bridge Module.
OEBM> set alert change enable
Alert CHANGE set to ENABLE
[ENTER]
Description
You can have the Bridge Module send an alert (trap) to the SNMP-based
management workstation (trap receiver) when any of the following three
system events happen:
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authentication - when a user tries to access the Bridge Module and the IP
Address of their workstation or device is not listed in the community table
with the proper access (i.e., read_only, read_write).
change - when any configuration or change is made to this concentrator.
hello - when an existing Bridge Module is reset in the concentrator. The
alert is sent once every minute until the management workstation
acknowledges the Bridge Module or for up to 4 hours and 15 minutes, at
which time it shuts off automatically.
The default setting is disable for all three of these parameters. If you
enable any of the parameters, an alert message is sent to the trap receiver
as defined in the community table.
Note: If you are using an SNMP-based workstation, the
workstation must be designated as the trap receiver
through the community table (SET COMMUNITY
command) for the traps to be sent to the appropriate
location.
Alert messages from Spanning Tree configuration changes will always be
sent to SNMP-based workstations designated as a trap receiver.
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SET BRIDGE
Use the SET BRIDGE command to change the bridge specific configuration
parameters.
Format
SET BRIDGE {parameter}
Parameters
{parameter} = ageing_time
channel
dip_configuration
side_switch_mode
Description
The SET BRIDGE command enables you to change the bridge configuration.
The SET BRIDGE command parameters have parameters of their own. The
following pages describe these parameters in detail.
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SET BRIDGE AGEING_TIME
Use the SET BRIDGE AGEING_TIME command to set the rate at which
addresses are aged out of the dynamic filtering table.
Format
SET BRIDGE AGEING_TIME {parameter}
Parameter
{parameter} = 1 - 16,666 minutes (default is 5 minutes)
Example
The following example SETs the bridge ageing_time parameter to 17
minutes.
OEBM> set bridge ageing_time 17 [ENTER]
Ageing time parameter changed
Description
The SET BRIDGE AGEING_TIME command enables you to set the rate at
which addresses are aged out of the dynamic address filtering table. If a
node address has been in the table for one age period without any new
activity from the node, it is removed.
A rate change will take effect immediately for your current session. Issue
the SAVE BRIDGE command if you want the new rate to remain effective
after the next boot.
Note: This parameter does not affect addresses that have been
added to the static filter address table using the SET FILTER
STATIC_ADDRESS_TABLE command.
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SET BRIDGE CHANNEL
Use the SET BRIDGE CHANNEL command to select the two channels you
want to bridge.
Note that this command must be used with caution. If used improperly, it
has the potential to disrupt the network.
Format
SET BRIDGE CHANNEL {port} {channel}
Parameters
{port} = port1 {1, 2, front, isolated} (default is front)
port2 {1, 2, 3, isolated} (default is 1)
Example
OEBM> set bridge channel port1 isolated [ENTER]
Port 1 channel parameter changed
Description
The SET BRIDGE CHANNEL command allows you to set the bridge channels
to the two channels you want to bridge.
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SET BRIDGE DIP_CONFIGURATION
Use the SET BRIDGE DIP_CONFIGURATION command to determine
whether the channels to which the Bridge Module is configured are read
from the dip switch settings or from memory when the Bridge Module is
reset or rebooted.
Note that this command must be used with caution. If used improperly, it
has the potential to disrupt the network.
Format
SET BRIDGE DIP_CONFIGURATION {setting}
Parameters
{setting} = disable
enable (default)
Example
OEBM> set bridge dip_configuration disable [ENTER]
Dip_configuration disabled
Description
The SET BRIDGE DIP_CONFIGURATION command determines whether the
channels to which the Bridge Module is configured are read from the dip
switch settings or from memory when the Bridge Module is reset or
rebooted.
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SET BRIDGE SIDE_SWITCH_MODE
Use the SET BRIDGE SIDE_SWITCH_MODE command to enable or disable
the Bridge Module's ability to detect when an Ethernet address in the
address table has switched from one port to the other.
Format
SET BRIDGE SIDE_SWITCH_MODE {setting}
Parameters
{setting} = disable
enable (default)
Example
OEBM> set bridge side_switch_mode disable [ENTER]
Side_switch_mode disabled
Description
When enabled, the SET BRIDGE SIDE_SWITCH_MODE command enables
the Bridge to detect when an Ethernet address that is currently identified in
the Bridge's address table as being on one port side has been switched to
the other port side. The Bridge can then automatically update its address
table to accurately reflect the configuration change. Side Switching should
be enabled in networking environments in which users are frequently
switched between networks (for example, when using ONline
Port-Switching modules).
When Side Switching is disabled, the Bridge does not recognize when an
Ethernet address listed in the address table has switched from one port side
to the other port side until the address gets aged out of the address table.
You may want to disable Side Switching when network security is critical.
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SET COMMUNITY
Use the SET COMMUNITY command to create an entry in the community
table.
Format
SET COMMUNITY {community} {IP Address} {access}
Parameters
{community} = {community name} or all
{IP Address} = {IP Address} or all
{access} = trap, read_write, read_trap, read_only, or all
All three of the parameter variables are required in the SET COMMUNITY
command line.
Example
The following example creates the community table entry called admin
and specifies that the associated workstation (with IP address 2.13.34.24)
has both read and write access to the Bridge Module variables (through
SNMP) and will receive all traps from the Bridge Module.
OEBM> set community admin 2.13.34.24 all
Community set
[ENTER]
Example
The following example gives the workstation with IP address 12.45.65.34
the community name super and enables the person who uses the
workstation read_write access to the Bridge Module variables (through
SNMP).
OEBM> set community super 12.45.65.34 read_write [ENTER]
Community set
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Example
The following example creates the community table entry called ncs and
specifies that all traps be sent to the IP address 1.2.3.4.
OEBM> set community ncs 1.2.3.4 trap [ENTER]
Community set
Description
The SET COMMUNITY command enables you to create a new entry in the
community table. Each community is granted the access you specify in the
{access} parameter in the SET COMMUNITY command line. The access
modes are:
trap access means that the device at the IP Address you specify will
receive SNMP alerts from the Bridge Module.
read_write means that the device at the IP Address you specify can
display information about the Bridge Module and can modify this
information (via SNMP).
read_trap means that the device at the IP Address you specify can display
information about the Bridge Module (via SNMP) and will receive SNMP
alerts.
read_only means that the device at the IP Address you specify can display
information about the Bridge Module (via SNMP).
all access means that the device at the IP Address you specify has
read_write and trap access to the Bridge Module.
You can enter up to ten community table entries of up to 15 characters
each. Note that the community name is case sensitive, i.e., NCS and ncs
are different community names.
Refer to the SHOW COMMUNITY command to view the existing
community table and the CLEAR COMMUNITY command to delete a
community entry.
Note: When you use the IP Address entry of all, you cannot use
trap, read_trap, or all access modes.
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SET DEVICE
Use the SET DEVICE command to change the Bridge Module device
configuration parameters.
Format
SET DEVICE {parameter}
Parameters
{parameter} = contact
default_gateway_port1
default_gateway_port2
diagnostics
ip_address_port1
ip_address_port2
location
name
password
sqe_mode
subnet_mask_port1
subnet_mask_port2
Description
The SET DEVICE command enables you change the Bridge Module
configuration parameters. To make changes permanent, issue the SAVE
DEVICE command. Use the SHOW DEVICE command to display the current
configuration information.
Since the parameters you can use with the SET DEVICE command have
parameters of their own, the following pages describe each parameter.
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SET DEVICE CONTACT
Use the SET DEVICE CONTACT command to enter contact information,
such as service contact's name, company, and telephone number.
Format
SET DEVICE CONTACT
Parameter
none
Example
OEBM> set device contact [ENTER]
Enter one line of text:
> Network Administrator x3658 [ENTER]
Contact changed
Description
The SET DEVICE CONTACT command enables you to enter contact
information, such as service contact's name, company, and telephone
number. Enter the command and press [ENTER]. You will be prompted to
enter one line of text (free-formatted text of up to 78 alpha-numeric
characters).
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SET DEVICE DEFAULT_GATEWAY_PORT1
Use the SET DEVICE DEFAULT_GATEWAY_PORT1 command to set the IP
address of the gateway that should be used when port 1 on the Bridge
Module does not recognize the receiver address on the local network.
Format
SET DEVICE DEFAULT_GATEWAY_PORT1 {IP address}
Parameter
{IP address} = n.n.n.n
Example
OEBM> set device default_gateway_port1 1.2.3.4 [ENTER]
Description
The SET DEVICE DEFAULT_GATEWAY_PORT1 command enables you to set
the IP address of the gateway that should be used when port 1 on the
Bridge Module does not recognize the receiver address on the local
network.
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SET DEVICE DEFAULT_GATEWAY_PORT2
Use the SET DEVICE DEFAULT_GATEWAY_PORT2 command to set the IP
address of the gateway that should be used when port 2 on the Bridge
Module does not recognize the receiver address on the local network.
Format
SET DEVICE DEFAULT_GATEWAY_PORT2 {IP address}
Parameter
{IP address} = n.n.n.n
Example
OEBM> set device default_gateway_port2 1.2.3.4 [ENTER]
Description
The SET DEVICE DEFAULT_GATEWAY_PORT2 command enables you to set
the IP address of the gateway that should be used when port 2 on the
Bridge Module does not recognize the receiver address on the local
network.
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SET DEVICE DIAGNOSTICS
Use the SET DEVICE DIAGNOSTICS command to enable or disable
diagnostics during start-up (or reboot) of the Bridge Module.
Refer to the RESET DEVICE command description for more information
about the purpose of the Diagnostics parameter.
Format
SET DEVICE DIAGNOSTICS {setting}
Parameters
{setting} = disable
enable (default)
Example
OEBM> set device diagnostics disable [ENTER]
DIAGNOSTICS option disabled
Description
The SET DEVICE DIAGNOSTICS command allows you to enable or disable
diagnostics during start-up (or reboot) of the Bridge Module.
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SET DEVICE IP_ADDRESS_PORT1
Use the SET DEVICE IP_ADDRESS_PORT1 command to set the Internet
Protocol address for port 1 on the Bridge Module.
Note that this command must be used with caution. If used improperly, it
has the potential to disrupt the network.
Format
SET DEVICE IP_ADDRESS_PORT1 {IP address}
Parameter
{IP address} = n.n.n.n
Example
OEBM> set device ip_address_port1 145.36.17.58 [ENTER]
Description
The SET DEVICE IP_ADDRESS_PORT1 command enables you to set the
Internet Protocol address for port 1 on the Bridge Module. The internet
protocol address is entered as n.n.n.n. (four decimal numbers).
Check with your Network Administrator for the next available IP address
that can be assigned to port 1 on your Bridge Module.
The factory default IP address for all Bridge Module ports is the loopback
address (127.0.0.1).
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SET DEVICE IP_ADDRESS_PORT2
Use the SET DEVICE IP_ADDRESS_PORT2 command to set the Internet
Protocol address for port 2 on the Bridge Module.
Note that this command must be used with caution. If used improperly, it
has the potential to disrupt the network.
Format
SET DEVICE IP_ADDRESS_PORT2 {IP address}
Parameter
{IP address} = n.n.n.n
Example
OEBM> set device ip_address_port2 145.36.17.60 [ENTER]
Description
The SET DEVICE IP_ADDRESS_PORT2 command enables you to set the
Internet Protocol address for port 2 on the Bridge Module. The internet
protocol address is entered as n.n.n.n. (four decimal numbers).
Check with your Network Administrator for the next available IP address
that can be assigned to port 2 on your Bridge Module.
The factory default IP address all Bridge Module ports is the loopback
address (127.0.0.1).
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SET DEVICE LOCATION
Use the SET DEVICE LOCATION command to describe the physical location
of the ONline System Concentrator in which the Bridge Module is installed.
Format
SET DEVICE LOCATION
Parameters
none
Example
OEBM> set device location [ENTER]
Enter one line of text:
>
Type in the physical location of your concentrator.
> Third floor Eng. Lab [ENTER]
Device location changed
Description
The SET DEVICE LOCATION command enables you to describe the physical
location of the ONline System Concentrator in which the Bridge Module is
installed. Enter the command and press [ENTER]. You will be prompted to
enter one line of text (free-formatted text of up to 78 alpha-numeric
characters).
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SET DEVICE NAME
Use the SET DEVICE NAME command to assign the Bridge Module a name
that can be used to identify it in addition to its IP address.
Format
SET DEVICE NAME {device name}
Parameter
{device name} = name up to 31 characters
Example
OEBM> set device name OEBM3 [ENTER]
Device name changed
Description
The SET DEVICE NAME command enables you to assign the Bridge Module
a name that can be used to identify it in addition to its IP address. The
name you enter is free-format up to 31 alphanumeric characters.
You can then use this name when remotely accessing the Bridge Module
using the REMOTE_LOGIN NAME {name} command instead of using the IP
or Ethernet address.
It is recommended that you make the device name and the terminal
prompt for the Bridge Module the same (refer to the SET TERMINAL
PROMPT command) so that during remote login sessions, you will know
whether you are in a local or remote session.
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SET DEVICE PASSWORD
Use the SET DEVICE PASSWORD command to establish administrator and
user passwords for the Bridge Module.
Format
SET DEVICE PASSWORD {group}
Parameters
{group} = administrator
user
Example
OEBM> set device password administrator [ENTER]
You are prompted as follows:
Enter current administrator password: current password [ENTER]
New password: new password [ENTER]
Verify: new password [ENTER]
Administrator password changed.
Description
The SET DEVICE PASSWORD command enables you to establish
administrator and user passwords for the Bridge Module.
The Bridge Module provides password protection to control access to
commands and information. Passwords may contain up to 15
alphanumeric characters and, for security reasons, are not shown on the
terminal screen when entered.
When you issue the SET DEVICE PASSWORD command you are first
prompted for the current administrator password, then the new
administrator or user password, then a verification of the new password.
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The administrator password gives the system administrator access to all of
the Bridge Module commands. The user password provides access to
commands that do not modify any bridge values or parameters, such as
those that allow the user to view status, get help, and logout.
Note that the new passwords are effective immediately. You must issue
the SAVE DEVICE command for the new passwords to be permanently
saved.
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SET DEVICE SQE_MODE
Use the SET DEVICE SQE_MODE command to display SQE (heartbeat)
failures on the output from the MONITOR and SHOW commands.
Format
SET DEVICE SQE_MODE {parameter}
Parameters
{parameter} = normal (default)
ignore
Example
OEBM> set device sqe_mode ignore [ENTER]
SQE Mode parameter changed
Description
The SET DEVICE SQE_MODE command enables you to display SQE
(heartbeat) failures on the output from the MONITOR and SHOW
commands.
The default setting is Normal, where SQE failures are displayed. The other
SQE_MODE parameter is Ignore. Set SQE_MODE to Ignore if the front
panel AUI port is to be used with non-SQE transceivers.
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SET DEVICE SUBNET_MASK_PORT1
Use the SET DEVICE SUBNET_MASK_PORT1 command to specify the
subnetwork mask for your type of Internet class.
Format
SET DEVICE SUBNET_MASK_PORT1 {mask}
Parameters
{mask} = 4-byte hex address
Example
OEBM> set device subnet_mask_port1 FF.FF.FF.0 [ENTER]
Device subnet mask changed.
Description
The SET DEVICE SUBNET_MASK_PORT1 command enables you to specify
the subnetwork mask for your type of Internet class. In general, the
subnetwork mask is a 32-bit IP address with all ones in the network and
subnet portions of the address and zeroes in the host portion.
For example, if the address of your Bridge Module is 151.104.6.10 (which is
a Class B network 151.104.0.0) and your company has elected to use the
third byte as the subnet identifier (in this example 6), the subnet mask is
255.255.255.0 (ff.ff.ff.00 in hexadecimal representation).
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SET DEVICE SUBNET_MASK_PORT2
Use the SET DEVICE SUBNET_MASK_PORT2 command to specify the
subnetwork mask for your type of Internet class.
Format
SET DEVICE SUBNET_MASK_PORT2 {mask}
Parameters
{mask} = 4-byte hex address
Example
OEBM> set device subnet_mask_port2 FF.FF.FF.0 [ENTER]
Description
The SET DEVICE SUBNET_MASK_PORT2 command enables you to specify
the subnetwork mask for your type of Internet class. In general, the
subnetwork mask is a 32-bit IP address with all ones in the network and
subnet portions of the address and zeroes in the host portion.
For example, if the address of your Bridge Module is 151.104.6.10 (which is
a Class B network 151.104.0.0) and your company has elected to use the
third byte as the subnet identifier (in this example 6), the subnet mask is
255.255.255.0 (ff.ff.ff.00 in hexadecimal representation).
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SET FILTER
Use the SET FILTER command to add a protocol ID to the protocol ID table,
set the mode of the protocol ID table, and add an address to the static
address table.
The SET FILTER commands are only available in administrator mode.
Format
SET FILTER {parameter}
Parameter
{parameter} = mode protocol_id_table
protocol_id_table
static_address_table
Description
The SET FILTER command enables you to add a protocol ID to the protocol
ID table, set the mode of the protocol ID table, and add an address to the
static address table.
Since the parameters you can use with the SET FILTER command have
parameters of their own, the following pages describe each parameter.
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SET FILTER MODE PROTOCOL_ID_TABLE
Use the SET FILTER MODEPROTOCOL_ID_TABLEco mmand to set the mode
in which entries of the protocol id table will be used.
Format
SET FILTER MODE PROTOCOL_ID_TABLE {mode}
Parameters
{mode} = disable (default)
filter
forward
Example
This example sets the protocol ID table to filter mode.
OEBM> set filter mode protocol_id_table filter [ENTER]
Description
The SET FILTER MODE PROTOCOL_ID_TABLE command enables you to set
the mode in which entries in the protocol id table will be used.
Each packet received by the bridge goes through the destination address
filter of the bridging process. If the packet is to be forwarded and the
mode of the protocol ID table is forward or filter, an additional filter
process is applied to all packets.
The Ethernet protocol type of the packet is compared against the contents
of the protocol type ID table. For example, if a match is found and the
mode is forward, then the packet is forwarded and transmitted out the
other port of the Bridge Module. If no match is found and the mode is
forward, the packet is discarded. If a match is found and the mode is filter,
the packet is also discarded. If a match is found and the mode is filter, the
packet is bridged and transmitted out the other port of the bridge.
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SET FILTER PROTOCOL_ID_TABLE
Use the SET FILTER PROTOCOL_ID_TABLE command to add a protocol ID to
the protocol id table.
Format
SET FILTER PROTOCOL_ID_TABLE {protocol ID}
Parameter
{protocol ID} = protocol ID in hex notation
Example
This example adds the protocol value 08-00, which is the DoD Internet
(TCP/IP), to the protocol id table.
OEBM> set filter protocol_id_table 08-00 [ENTER]
Protocol ID added to Protocol ID table
Description
The SET FILTER PROTOCOL_ID_TABLE command enables you to add a
protocol ID to the protocol id table.
In conjunction with the SETFILTER MODE command, you can elect to allow
or disallow specific Ethernet protocols from being bridged.
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SET FILTER STATIC_ADDRESS_TABLE
Use the SET FILTER STATIC_ADDRESS_TABLE command to add node
addresses to the static address table.
Format
SET FILTER STATIC_ADDRESS_TABLE {variable}
{MAC address}
Parameters
{variable} = always_forward
never_forward_to_port1
never_forward_to_port2
{MAC address} = XX-XX-XX-XX-XX-XX
Example
OEBM>set filter static_address_table never_forward_to_port1 [ENTER]
Enter MAC Address: 03-00-06-07-17-01 [ENTER]
Address added to filter table.
Do SAVE FILTER and RESET DEVICE to use changes.
Description
The SET FILTER STATIC_ADDRESS_TABLE command enables you to add
node addresses to the static address table.
Alw ays_Forw ard Parameter
Specifying the Always_Forward parameter with a subsequent MAC address
will result in all received frames with the specified MAC address as the
destination address being bridged (to the other bridge port) by the Bridge
Module.
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Never_Forw ard_To_Port1 Parameter
Specifying the Never_Forward_To_Port1 parameter with a subsequent
MAC address will result in all frames received at port 2 of the Bridge
Module with the specified MAC address as the destination address being
discarded by the Bridge Module rather than being bridged to port 1.
Never_Forw ard_To_Port2 Parameter
Similarly, specifying the Never_Forward_To_Port2 parameter with a
subsequent MAC address will result in all frames received at port 1 being
discarded if the destination address matches the specified MAC address.
Once you have selected the parameter you want to use, enter a
hexadecimal MAC address in the following format:
XX-XX-XX-XX-XX-XX
Note that these address changes do not take effect until the changes are
saved and Bridge Module is reset. Therefore, it is recommended that you
enter the SAVE FILTER and RESET DEVICE commands after modifying the
static address table so that these changes take effect as soon as possible.
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SET SPANTREE
Use the SET SPANTREE command to change the Spanning Tree
configuration parameters of the local Bridge Module.
Format
SET SPANTREE {parameter}
Parameters
{parameter} = bridge_priority
forward_delay_time
listen_time
mode
hello_address
hello_time
path_cost_port1
path_cost_port2
Description
The SET SPANTREE command enables you to change the Spanning Tree
configuration parameters of the local Bridge Module. These configuration
parameters will become active if this Bridge Module becomes the Root
bridge for the network.
Note that the values assigned to forward_delay_time, hello_time, and
listen_time using the SETSPANTREE command are active and in effect only
when the local Bridge Module is the root of the Spanning Tree. Otherwise,
when the local bridge is a non-root bridge the Root Bridge imposes its
values for forward_delay_time, hello_address, hello_time, and listen_time
throughout the network (including the local bridge) for as long as that
bridge continues to be the Root Bridge.
The SET SPANTREE command parameters have parameters of their own.
The following pages describe these parameters in detail.
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SET SPANTREE BRIDGE_PRIORITY
Use the SET SPANTREE BRIDGE_PRIORITY command to change the
Spanning Tree priority of the local Bridge Module.
Format
SET SPANTREE BRIDGE_PRIORITY {variable}
Parameters
{variable} = 0 - 65535 (default is 128)
Example
OEBM> set spantree bridge_priority 117 [ENTER]
Spanning tree parameter changed
Description
The SET SPANTREE BRIDGE_PRIORITY command enables you to change the
Spanning Tree priority of the local Bridge Module.
The bridge priority is used with the bridge Ethernet Address to determine
which bridge becomes the Root Bridge in the network. The full bridge
priority is the numeric value that consists of (Bridge Priority)/(Bridge
Ethernet Address), for example, 128/08008F00A103. Since the bridge
priority is the first part of this number, lowering this value has a dramatic
effect on whether the bridge is the Root Bridge or not.
The Root Bridge controls the active Forward Delay_Time, Hello_Address,
Hello_Time, and Listen_Time parameters used by all bridges that are active
in the Spanning Tree topology. The 3Com factory setting for the bridge
priority is 128 to reduce the chance that this bridge will have the lowest
number and so become root. It is suggested that you do not change this
value unless you want to force this bridge to be the root.
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SET SPANTREE FORWARD_DELAY_TIME
Use the SET SPANTREE FORWARD_DELAY_TIME command to set the
amount of time bridges wait in each of the states when moving from
Listening to Forwarding mode.
This value will take effect for the overallnetwork when this bridge becomes
the Root Bridge.
Format
SET SPANTREE FORWARD_DELAY_TIME {variable}
Parameters
{variable} = 4 - 30 seconds (default is 15 seconds)
See Note for range restrictions.
Example
OEBM> set spantree forward_delay_time 27 [ENTER]
Spanning tree parameters changed
Description
The SET SPANTREE FORWARD_DELAY_TIME command enables you to set
the amount of time the bridge waits in each of the states when moving
from Listening to Forwarding mode. This command setting takes effect
only if this bridge becomes the Root Bridge. The modes that are affected
by this parameter are Listening and Learning.
For example, using the default time of 15 seconds, a backup bridge (in a
Blocking state) requires a total of 30 seconds to take over as the
designated bridge once it has determined that the primary (or designated)
bridge has failed: 15 seconds in the Listening state, 15 seconds in the
Learning state, and then the Forwarding of packets starts again.
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As a reminder, this parameter at the local Bridge Module has no effect on
the operation of the network until the local bridge becomes the Root
Bridge. While the local bridge is a non-root bridge, it will function using the
Root Bridge's value for this parameter.
Note: If you choose to modify the spantree parameter default
values for forward_delay_time, hello_time, or listen_time,
you must use the following two formulas to calculate new
values:
1. 2 * (forward_delay_time - 1.0 seconds) > listen_time
2. listen_time > 2 * (hello_time + 1.0 seconds)
The following two examples use the formulas with parameter default
values to calculate new values.
1. 2 * (15 seconds - 1.0 seconds) = 28 seconds > 20 seconds. Since
28 seconds is greater than the listen_time default value of 20
seconds, this setting is valid.
2. 20 seconds > 2 * (2 seconds + 1.0 second) = 6 seconds
Since 20 seconds is greater than 6 seconds, this setting is valid.
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SET SPANTREE HELLO_ADDRESS
Use the SET SPANTREE HELLO_ADDRESS command to modify the MAC
address which the Bridge Module uses for its spanning tree hello address.
Format
SET SPANTREE HELLO_ADDRESS {MAC address}
Parameters
{MAC address} = XX-XX-XX-XX-XX-XX
Example
OEBM> set spantree hello_address 08-00-8f-10-13-56 [ENTER]
Spanning tree parameters changed
Description
The SET SPANTREE HELLO_ADDRESS command enables you to change the
MAC address which the Bridge Module uses for its spanning tree hello
address. Modifying the spanning tree hello address enables you to create
multiple spanning tree multicast domains.
The MAC address for this command must be entered in the following
format:
XX-XX-XX-XX-XX-XX
Note that this address must be a multicast address. Any address other than
a multicast address will not be accepted.
Note: Using an address (other than the default spanning tree
hello address 01-80-C2-00-00-00) from the IEEE 802.1(d)
reserved multicast addresses as the new spantree hello
address may cause subsequent network problems in a
bridged subnetwork. This is because all IEEE
802.1(d)-compliant bridges in your network will not bridge
these IEEE 802.1(d) reserved multicast addresses.
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SET SPANTREE HELLO_TIME
Use the SET SPANTREE HELLO_TIME command to change how often the
local bridge sends out a hello packet when it becomes the Root Bridge.
This value will take effect for the overallnetwork when this bridge becomes
the Root Bridge.
Format
SET SPANTREE HELLO_TIME {variable}
Parameters
{variable} = 1 - 10 (default is 2 seconds)
See Note for range restrictions.
Example
OEBM> set spantree hello_time 7 [ENTER]
Spanning tree parameters changed
Description
The SET SPANTREE HELLO_TIME command enables you to change how
often the local bridge sends out a hello packet when it becomes the Root
Bridge. This packet is sent to all other Ethernet Bridges to let them know
the root is still active.
As a reminder, this parameter at the local Bridge Module has no effect on
the operation of the network until the local bridge becomes the Root
Bridge. While the local bridge is a non-root bridge, it will function using the
Root Bridge's value for this parameter.
If you choose to modify the spantree parameter default values for
forward_delay_time, hello_time, or listen_time, you must use the following
two formulas to calculate new values:
1. 2 * (forward_delay_time - 1.0 seconds) > listen_time
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2. listen_time > 2 * (hello_time + 1.0 seconds)
The following two examples use the formulas with parameter default
values to calculate new values.
1. 2 * (15 seconds - 1.0 seconds) = 28 seconds > 20 seconds. Since 28
seconds is greater than the listen_time default value of 20 seconds,
this setting is valid.
2. 20 seconds > 2 * (2 seconds + 1.0 second) = 6 seconds Since 20
seconds is greater than 6 seconds, this setting is valid.
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SET SPANTREE LISTEN_TIME
Use the SET SPANTREE LISTEN_TIME command to specify how long bridges
will wait for the Root Bridge to send out a hello packet.
This value will take effect for the overallnetwork when this bridge becomes
the Root Bridge.
Format
SET SPANTREE LISTEN_TIME {variable}
Parameters
{variable} = 6 - 40 (default is 20 seconds)
See Note for range restrictions.
Example
OEBM> set spantree listen_time 7 [ENTER]
Spanning tree parameter changed.
Description
The SET SPANTREE LISTEN_TIME command enables you to specify how
long the bridge will wait for the Root Bridge to send out a hello packet. If
a bridge does not receive the packet within the time set with this
parameter, it will assume the root is not active and begin calling out that it
is now the Root Bridge. It is suggested that you make this value larger if
you have a low-speed or very wide-area network.
As a reminder, this parameter at the local Bridge Module has no effect on
the operation of the network until the local bridge becomes the Root
Bridge. While the local bridge is a non-root bridge, it will function using the
Root Bridge's value for this parameter.
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Note: If you choose to modify the spantree parameter default
values for forward_delay_time, hello_time, or listen_time,
you must use the following two formulas to calculate new
values:
1. 2 * (forward_delay_time - 1.0 seconds) > listen_time
2. listen_time > 2 * (hello_time + 1.0 seconds)
The following two examples use the formulas with parameter default
values to calculate new values.
1. 2 * (15 seconds - 1.0 seconds) = 28 seconds > 20 seconds. Since 28
seconds is greater than the listen_time default value of 20 seconds,
this setting is valid.
2. 20 seconds > 2 * (2 seconds + 1.0 second) = 6 seconds Since 20
seconds is greater than 6 seconds, this setting is valid.
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SET SPANTREE MODE
Use the SET SPANTREE MODEcommand to en able or disable the Spanning
Tree Algorithm and Protocol (STAP).
Format
SET SPANTREE MODE {setting}
Parameters
{setting} = disable
enable (default)
Example
OEBM> set spantree mode disable [ENTER]
Spanning tree parameter changed
Description
The SET SPANTREE MODE command allows you to enable or disable the
Spanning Tree Algorithm and Protocol (STAP).
3Com recommends that for stable fault tolerant network topologies, the
Spanning Tree mode remain enabled.
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SET SPANTREE PATH_COST_PORT1
Use the SET SPANTREE PATH_COST_PORT1 command to change the path
cost of port 1 on the local Bridge Module.
Format
SET SPANTREE PATH_COST_PORT1 {variable}
Parameters
{variable} = 1 - 65535 (default is 10)
Example
OEBM> set spantree path_cost_port1 17 [ENTER]
Spanning tree parameter changed
Description
The SET SPANTREE PATH_COST_PORT1 command enables you to change
the path cost of port 1 on the local Bridge Module.
The Spanning Tree Protocol seeks to minimize the path cost between each
bridge and the Root Bridge (called the root path cost). The “root path
cost” represents the distance between this bridge and the Root Bridge, and
should be a lower value as the distance is lessened.
Modifying the value for the port 1 path cost at the local bridge may cause
bridges “beneath” the local bridge in the Spanning Tree to change their
path to the Root Bridge depending on the benefit or drawback of going
through the local bridge.
Changing values may also result in a port currently in Blocking state on the
local bridge to transition into Forwarding state and vice versa if the cost
associated with the once Blocking port is now lower.
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SET SPANTREE PATH_COST_PORT2
Use the SET SPANTREE PATH_COST_PORT2 command to change the path
cost of port 2 on the local Bridge Module.
Format
SET SPANTREE PATH_COST_PORT2 {variable}
Parameters
{variable} = 1 - 65535 (default is 10)
Example
OEBM> set spantree path_cost_port2 36 [ENTER]
Spanning tree parameter changed
Description
The SET SPANTREE PATH_COST_PORT2 command enables you to change
the path cost of port 2 on the local Bridge Module.
The Spanning Tree Protocol seeks to minimize the path cost between each
bridge and the Root Bridge (called the root path cost). The “root path
cost” represents the distance between this bridge and the root bridge, and
should be a lower value as the distance is lessened.
Modifying the value for the port 2 path cost at the local bridge may cause
bridges “beneath” the local bridge in the Spanning Tree to change their
path to the root bridge depending on the benefit or drawback of going
through the local bridge.
Changing values may also result in a port currently in Blocking state on the
local bridge to transition into Forwarding state and vice versa if the cost
associated with the once Blocking port is now lower.
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SET TERMINAL
Use the SET TERMINAL command to change the TERMINAL parameters for
the Bridge Module. These configurations enable the Bridge Module to
communicate with the terminal to which it is connected.
Format
SET TERMINAL {parameter}
Parameters
{parameter} = baud
data bits
hangup
parity
prompt
stop_bits
timeout
Description
The SET TERMINAL commands enable you to change the terminal
configuration for the Bridge Module.
The SET TERMINAL command parameters have parameters of their own.
The following pages describe these parameters in detail.
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SET TERMINAL BAUD
Use the SET TERMINAL BAUD command to establish the appropriate baud
rate at which the Bridge Module receives and transmits data to your
terminal or modem.
Format
SET TERMINAL BAUD {baud rate}
Parameters
{baud rate} = 300, 1200, 2400, 4800, or 9600 (default is 9600)
Example
This example changes the baud rate to 4800 baud.
OEBM> set terminal baud 4800
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL BAUD command enables you to establish the
appropriate baud rate at which the Bridge Module receives and transmits
data to your terminal or modem.
Check the baud rate of the device before connecting a terminal or modem
to the Bridge Module. Your device and the Bridge Module must be set at
the same baud rate in order to communicate.
If you need to set the Bridge Module to communicate with a device that
has a baud rate lower than 9600 baud, use the following procedure:
1. Connect a terminal (set to 9600 baud) to the Bridge Module (via the
RS-232 front panel serial port) and log on to the bridge.
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2. Issue the SET TERMINAL BAUD command to set the Bridge Module
terminal port baud rate to your specifications. Once you set this
lower rate, you will lose your connection to the Bridge Module since
your terminal is set to a different rate.
3. Remove the terminal connection, change the terminal's baud rate,
and reconnect the terminal to the serial port to resume your
connection to the Bridge Module.
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SET TERMINAL DATA_BITS
Use the SET TERMINAL DATA_BITS command to set the number of data
bits used by your terminal.
Format
SET TERMINAL DATA_BITS {data bits}
Parameters
{data bits} = 7
8 (default)
Example
This example changes the data bits to 7.
OEBM> set terminal data_bits 7
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL DATA_BITS command enables you to set the number of
data bits used by your terminal.
Note that if your terminal or modem and the Bridge Module do not have
the same data bit setting you will not be able to log in.
The procedure to change the baud rate can also be used to modify terminal
data bits.
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SET TERMINAL HANGUP
Use the SET TERMINAL HANGUP command to configure how a modem
connection is terminated when the LOGOUT command is entered during a
modem session.
Format
SET TERMINAL HANGUP {setting}
Parameters
{setting} = disable (default)
enable
Example
OEBM> set terminal hangup enable [ENTER]
Terminal parameter change
Description
The SET TERMINAL HANGUP command enables you to configure how a
modem connection is terminated when the LOGOUT command is entered
during a modem session.
If the HANGUP setting is enabled and you log out of the system, the
modem is automatically disconnected, closing down that connection.
The modem is also disconnected if this setting is enabled and you leave
your terminal unattended for the amount of time established by the
terminal TIMEOUT command. If the HANGUP setting is disabled and you
log out of the system, the modem is disconnected only when you explicitly
hang up the modem.
Note: If you do not hang up the modem, an unauthorized user
may pick up the last login session.
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SET TERMINAL PARITY
Use the SET TERMINAL PARITY command to set the parity to match the
parity setting used by your terminal.
Format
SET TERMINAL PARITY {parity}
Parameters
{parity} = even
none (default)
odd
Example
This example changes the terminal parity to even.
OEBM> set terminal parity even
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL PARITY command enables you to set the parity to
match the parity setting used by your terminal.
Note that your Bridge Module terminal port and your terminal or modem
must have the same parity setting, or you will not be able to log in.
The procedure to change the baud rate can also be used to modify terminal
parity.
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SET TERMINAL PROMPT
Use the SET TERMINAL PROMPT command to customize the management
prompt that displays on your terminal when connected to a local Bridge
Module.
Format
SET TERMINAL PROMPT {prompt}
Parameters
{prompt} = terminal prompt up to 15 characters
Example
This example changes the terminal prompt to OEBM3>.
OEBM> set terminal prompt OEBM3>
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL PROMPT command enables you to customize the
management prompt that displays on your terminal when connected to a
local Bridge Module.
This command allows you to customize your management prompt with a
string of up to 15 characters in length. You must include all the characters
in the new prompt, including the angle bracket (>) if desired.
Note: 3Com recommends that you make the terminal prompt
and the device name the same for your particular Bridge
Module. In this manner, if you are remotely connected to
this bridge, the prompt will help to indicate that there is a
remote connection established.
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SET TERMINAL STOP_BITS
Use the SET TERMINAL STOP_BITS command to establish the number of
stop bits between characters when communicating between your terminal
and the Bridge Module.
Format
SET TERMINAL STOP_BITS {stop bits}
Parameters
{stop bits} = 1
2 (default)
Example
This example changes the Bridge Module stop bits parameter to 1.
OEBM> set terminal stop_bits 1
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL STOP_BITS command enables you to establish the
number of stop bits between characters when communicating between
your terminal and the Bridge Module.
The Bridge Module is factory-set to 2 stop bits to signal the end of a
character being received and to reset the line to an idle state. If your
terminal and the Bridge Module do not have the same stop bits setting,
you may lose characters as the terminal receives them from the Bridge
Module.
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SET TERMINAL TIMEOUT
Use the SET TERMINAL TIMEOUTcommand to set the amount of time that
your terminal maybe unattended before being logged off from the Bridge
Module.
Format
SET TERMINAL TIMEOUT {minutes}
Parameters
{minutes} = minutes from 1 - 30
0 (zero - for no timeout)
Example
This example changes the Bridge Module timeout parameter to 3 minutes.
OEBM> set terminal timeout 3
Terminal parameter changed
[ENTER]
Description
The SET TERMINAL TIMEOUT command enables you to set the amount of
time that your terminal may be unattended before being logged off from
the Bridge Module.
Once timeout has been set, you are given that amount of time in which to
respond to a screen prompt. If you do not respond within the set amount
of time, the messages “Parser timed out” and “WARNING: Unsaved
changes lost” are displayed. The terminal then beeps, and you are logged
out of the system. The MONITOR command will not be interrupted by a
non-zero timeout parameter.
Note: If a modem connection is in progress and the HANGUP
command is enabled, the modem will also be disconnected
upon a timeout.
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If TIMEOUT has been set for a remote Bridge Module and the time expires,
you will be logged out of the remote bridge and returned to the local
bridge connection.
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SHOW
Use the SHOW command to list the current bridge attributes. The SHOW
command requires a parameter to display bridge attributes.
Format
SHOW {parameter}
Parameters
{parameter} = alert
bridge
community
counter
device
filter
last_error
spantree
terminal
Description
The SHOW command displays the current configuration settings for the
Bridge Module. The commands to set these configurations are described in
the SET command section.
Since the parameters you can use with the SHOW command have
parameters of their own, the following pages describe each parameter.
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SHOW ALERT
Use the SHOW ALERT command to display alert configuration settings.
Format
SHOW ALERT
Parameters
none
Example
OEBM> show alert
[ENTER>
Alert AUTHENTICATION set to ENABLE
Alert CHANGE
Alert HELLO
set to ENABLE
set to ENABLE
Description
The SHOW ALERT command displays current alert configuration settings.
These settings are described in the SET ALERT commands section.
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SHOW BRIDGE
Use the SHOW BRIDGE command to display bridge parameters and their
current values.
Format
SHOW BRIDGE
Parameters
none
Example
OEBM> show bridge [ENTER]
Bridge Parameters:
Ageing Time:
Dip Configuration: ENABLED
Current Status: Normal
Protocols Supported: Console Terminal
Chipcom Remote Console
SNMP
5
Per Port Information:
Current
Memory
Dip
1
2
Port 1 Channel:
Port 2 Channel:
1
2
1
2
Description
The SHOW BRIDGE command displays bridge parameters and their current
values.
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Table 4-2 describes the SHOW BRIDGE parameters.
Table 4-2. SHOW BRIDGE Command Attributes
Attribute
Ageing Time
Description
The rate at which addresses are aged out
of the dynamic filtering table.
Dip Configuration
Determines whether the channel
configuration is read from the dip switch
settings or memory upon bridge reset.
Current Status
The current state of the Bridge Module.
Protocols Supported
The protocols that the Bridge Module
supports.
Port 1/2 Channel: Current
Port 1/2 Channel: Memory
The channels to which port 1 and port 2
of the Bridge Module are currently
bridging.
The channels to which port 1 and port 2
of the Bridge Module are configured
according to the values stored in
memory. These are the channels which
will be bridged if the Bridge Module is
reset and the Dip Configuration
parameter is disabled.
Port 1/2 Channel: Dip
The channels which port 1 and port 2 are
configured according to the dip switch
settings. These are the channels which
will be bridged if the Bridge Module is
reset and the Dip Configuration
parameter is enabled.
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SHOW COMMUNITY
Use the SHOW COMMUNITY command to list the current community table
for the Bridge Module.
Format
SHOW COMMUNITY
Parameters
none
Example
OEBM> show community
[ENTER]
Index Community Name IP Address Access
————— —————————————— —————————— —————————
1
2
user1
ncs
13.24.38.54 Read
13.24.35.41 All
3
4
super
admin
13.24.43.83 Read
13.24.56.98 Read/Write
5
6
7
8
9
10
[empty]
[empty]
[empty]
[empty]
[empty]
[empty]
Description
The SHOW COMMUNITY command displays the current community
settings for the Bridge Module. Note that the IP Address ***.***.***.***
means all users.
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SHOW COUNTER
Use the SHOW COUNTER command to display the statistical counters for
the bridge, ports, protocols, and spanning tree.
Format
SHOW COUNTER {parameter}
Parameters
{parameter} = bridge
ports
protocols
spantree
Description
The SHOW COUNTER command displays the statistical counters for the
bridge, ports, protocols, and spanning tree.
Since the description for each SHOW COUNTER parameter includes sample
output and a table, each parameter is described in the following pages for
greater clarity.
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SHOW COUNTER BRIDGE
Use the SHOW COUNTER BRIDGE command to display the statistical
counters for the bridged packets.
Format
SHOW COUNTER BRIDGE
Parameters
none
Example
OEBM> show counter bridge [ENTER]
3658 Seconds Since Clear
Spanning Tree State
Port 1
FORWARDING FORWARDING
Port 2
Frames Received for Bridging
Frames Transmitted by Bridging
Frames Discarded by Filtering
10032
9727
1108
9736
10027
0
Description
The SHOW COUNTERBRIDGE command displays the statisticalcounters for
the bridged packets.
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Table 4-3 describes the SHOW COUNTER BRIDGE attributes.
Table 4-3. SHOW COUNTER BRIDGE Command
Attributes
Attribute
Description
Seconds Since Clear The time since the Bridge Module was either
reset or the CLEAR command was issued for this
group of statistics.
Spanning Tree State Current Spanning Tree state of this Bridge
Module port: Forwarding, Learning, Listening,
Blocking, or Disabled.
Frames Received for Number of frames received from the network by
Bridging
this Bridge Module port.
Frames Transmitted
by Bridging
Number of frames transmitted onto the network
by this Bridge Module port.
Frames Discarded by Number of frames received from this network
Filtering
and discarded by the filtering processes of this
Bridge Module port.
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SHOW COUNTER PORTS
Use the SHOW COUNTER PORTS command to display the statistical
counters for the Bridge Module ports.
Format
SHOW COUNTER PORTS
Parameters
none
Example
OEBM> show counter ports
[ENTER]
Port 1 Port 2
67 Seconds Since Clear
Frames Received
Bytes Received
Frames Transmitted
Bytes Transmitted
219
20973
2
242
2688
197
128
14896
Transmissions Initially Deferred 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Transmissions Retried Once
Transmissions Multiply Retried
Excessive Collisions
0
0
0
0
Received Framing Error
Received Frame Check (FCS) Error 0
Receiver Overflows
Receiver Buffer Error
Babble Failures
Receiver Missed Frames
SQE (Heartbeat) Failures
Transmitter Underflowed
Late Collisions
0
0
0
0
0
0
0
0
Transmitter Lost Carrier
Description
The SHOW COUNTER PORTS command displays the statistical counters for
the Bridge Module ports.
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Table 4-4 describes the SHOW COUNTER PORTS attributes.
Table 4-4. SHOW COUNTER PORTS Command Attributes
Attribute
Description
Seconds Since Clear
The time since the localbridge was either
reset or the CLEAR command was issued
for this group of statistics.
Frames Received
Bytes Received
Number of frames received from the
network by this Bridge Module port.
Number of bytes received from the
network by this Bridge Module port.
Dividing this number by the number of
frames received will give an average
frame size received.
Frames Transmitted
Bytes Transmitted
Number of frames transmitted onto the
network by this Bridge Module port.
Number of bytes transmitted onto the
network by this Bridge Module port.
Dividing this number by the number of
frames transmitted will give an average
frame size transmitted.
Transmissions Initially
Deferred
Number of transmissions deferred
because the network was busy.
Transmissions Retried Once
Number of transmissions retried once
because of collisions.
Transmissions Multiply
Retried
Number of transmissions retried more
than once because of a collision (does
not include counts from above statistics)
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Table 4-4. SHOW COUNTER PORTS Command Attributes
Attribute
Description
Excessive Collisions
Number of packets the bridge discarded
because it could not transmit onto the
Ethernet without seeing a collision 16
times in a row.
Received Framing Error
Number of Ethernet packets received
without proper framing.
Received Frame Check (FCS) Number of Ethernet packets received
Error
with bad FCS(Frame CheckSequence) —
usually these and framing errors are seen
together.
Received Overflows
This can occur when packets arrive from
one port faster than they can be output
on the other port. As network size
increases, the likelihood of these errors
increases. They are not fatal errors.
Received Buffer Error
This error occurs on the receive end
when the Ethernet chip wants to chain
data buffers and does not own the next
buffer.
Babble Failures
Number of times the bridge told the
Ethernet chip to send out an illegallylong
Ethernet packet.
Receiver Missed Frames
Number of times the receiver missed a
frame. This can occur when packets
arrive from one port faster than they can
be output on the other port. As network
size increases, the likelihood of these
errors increases. They are not fatal
errors.
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Table 4-4. SHOW COUNTER PORTS Command Attributes
Attribute
Description
SQE (Heartbeat) Failures
(You can disable this
attribute using the SET
DEVICE SQE_MODE
command)
Number of times the frame was
transmitted without successful SQE
(heartbeat). This is not a fatal error. It
may occur when SQE is turned off at the
transceiver.
Transmitter Underflowed
Number of times a frame transmit
aborted because the Ethernet Controller
could not access memory.
Late Collisions
Numberofcollisionsafterthe slot-time of
the channel has expired.
Transmitter Lost Carrier
Number of times a frame was sent and
there was an open tap into the Ethernet
(AUI port disconnected).
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SHOW COUNTER PROTOCOLS
Use the SHOW COUNTER PROTOCOL command to display the statistical
counters for the Bridge Module protocols. These counters reflect the
amount of traffic on the network.
Format
SHOW COUNTER PROTOCOLS
Parameters
none
Example
OEBM> show counter protocols [ENTER]
827 Seconds Since Clear
Unicast Packets Received
Non-Unicast Packets Received
Unicast Packets Transmitted
Non-Unicast Packets Transmitted 0
Description
Port 1
Port 2
0
0
0
0
0
0
0
The SHOW COUNTER PROTOCOLS command displays the statistical
counters for the Bridge Module protocols.
These counters reflect the amount of traffic processed by the bridge as an
end station in the attached networks. This traffic will be composed of
remote_login sessions, SNMP frames, PING messages, and ARP frames.
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Table 4-5 describes the SHOW COUNTER PROTOCOLS attributes.
Table 4-5. SHOW COUNTER PROTOCOLS Command
Attributes
Attribute
Description
Seconds Since Clear The time since the Bridge Module was either
reset or the CLEAR command was issued for this
group of statistics.
Unicast Packets
Received
Number of packets received for which this bridge
is an end station on the attached networks.
Non-Unicast Packets Number of packets received for which this bridge
Received
is an end station on the attached networks.
Unicast Packets
Transmitted
Number of packets generated (to a specific MAC
address) by this bridge as an end station, either
in response to received packets or as a result of a
Management command (i.e., PING).
Non-Unicast Packets Number of Broadcast and Multicast packets
Transmitted
generated by this bridge as an end station, either
in response to received packets or as a result of a
Management command (i.e., PING).
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SHOW COUNTER SPANTREE
Use the SHOW COUNTER SPANTREE command to display the statistical
counters for the Bridge Module spantree parameters.
Format
SHOW COUNTER SPANTREE
Parameters
none
Example
OEBM> show counter spantree [ENTER]
811 Seconds Since Clear
Spanning Tree State
Port 1
FORWARDING FORWARDING
Port 2
Spanning Tree Frames Received
Spanning Tree Frames Transmitted 177
0
177
0
Port Independent Statistics
Topology Change Count
Seconds Since Topology Changed
Active Hello Time
3
1736
7
Active Forward Delay
Active Listen Time
11
27
This bridge is the root bridge
Description
The SHOW COUNTER SPANTREE command displays the statistical counters
for Spanning Tree. If Spanning Tree is disabled, this screen will be blank.
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Table 4-6 describes the SHOW COUNTER SPANTREE attributes.
Table 4-6. SHOW COUNTER SPANTREE Command Attributes
Attribute
Description
Seconds Since Clear
The time since the Bridge Module was
either reset or the CLEAR command was
issued for this group of statistics.
Spanning Tree State
Current spantree state of the Bridge
Module port:
Forwarding, Learning, Listening,
Blocking, or Disabled.
Spanning Tree Frames
Received
Number of Spanning Tree frames
received from the network by this Bridge
Module port.
Spanning Tree Frames
Transmitted
Number of Spanning Tree frames
transmitted onto the network by this
Bridge Module port.
Topology Change Count
Count of Spanning Tree topology
changes detected by this bridge.
Seconds Since Topology
Changed
Time since the last topology change was
detected by this bridge.
Active Hello Time
Active Forward Delay
Active Listen Time
Hello time specified by the current Root
Bridge.
Forward delay time specified by the
current Root Bridge.
Listen time specified by the current Root
Bridge.
Message to indicate if this
bridge is the Root Bridge.
This bridge is the Root Bridge.
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SHOW DEVICE
Use the SHOW DEVICE command to display device-related information.
Format
SHOW DEVICE
Parameters
none
Example
OEBM> show device [ENTER]
ONline Ethernet Bridge Module (Bridge Module); SNMP
Management
Name: Bridge3
Boot EPROM Version:v1.3
Serial#:3658
Restarts:9
Flash EPROM Version: v2.00 Service Date: / /
Location:
Third Floor Engineering
Port 1
Port 2
MAC Address:
IP Address:
Subnet Mask
08-00-8F-10-13-48 08-00-8F-10-13-49
127.1.2.3
127.1.2.3
FF.FF.FF.00
0.0.0.0
FF.FF.FF.00
Default Gateway 0.0.0.0
For assistance contact: Network Administrator
Diagnostics: ENABLED
SQE_Mode: NORMAL
Description
The SHOW DEVICE command displays the firmware version of the Bridge
Module and other device related information.
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Table 4-7 describes the command attributes.
Table 4-7. SHOW DEVICE Command Attributes
Attribute
Description
MAC Address
IP Address
Unique 48-bit address assigned to this interface.
IP address currently assigned to the Bridge ports.
Subnet Mask
Subnetwork maskspecified for the network Internet
class.
Default Gateway IPaddress of the default gatewayfor packets withan
unknown destination IP address.
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SHOW FILTER
Use the SHOW FILTER command parameters to display the entries in the
dynamic address filter table, the contents or mode of the protocol ID table,
and the contents of the static address table.
Format
SHOW FILTER {parameter}
Parameters
{parameter} = dynamic_address_table
mode
protocol id_table
static_address_table
Description
The SHOW FILTER command displays the entries in the dynamic address
filter table,the contents or mode of the protocol ID table, and the contents
of the static address table.
For clarity, the SET FILTER command parameters are described in the
following pages.
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SHOW FILTER DYNAMIC_ADDRESS_TABLE
Use the SHOW FILTER DYNAMIC_ADDRESS_TABLE command to display
active entries in the dynamic address filter table at each of the bridge ports.
Format
SHOW FILTER DYNAMIC_ADDRESS_TABLE {port}
Parameters
{port} = port1
port2
Example
The following example displays the active entries in the dynamic filter table
for port 1.
OEBM> show filter dynamic_address_table port1 [ENTER]
00-00-0C-00-AD-E3
00-00-0C-01-17-6E
02-60-8C-0D-E1-AF
02-60-8C-3F-48-8B
00-00-0C-00-EE-07
00-00-B5-08-03-57
02-60-8C-OE-89-E9
02-60-8C-3C-CA-D9
Description
The SHOW FILTER command displays all dynamic entries since the last reset
which have not been “aged out”. Note that for ports that have no
addresses in the dynamic filtering table, the message “0 dynamic entries” is
displayed.
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SHOW FILTER MODE
Use the SHOW FILTER MODE command to display the current protocol id
table filtering mode.
Format
SHOW FILTER MODE
Parameters
none
Example
OEBM> show filter mode [ENTER]
Filtering Mode:
Protocol ID table mode is FILTER
Description
The SHOW FILTER MODE command displays the current protocol id table
filtering mode. Filtering modes are either disabled, filter, or forward.
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SHOW FILTER PROTOCOL_ID_TABLE
Use the SHOW FILTER PROTOCOL_ID_TABLE command to display the
contents of the protocol id table.
Format
SHOW FILTER PROTOCOL_ID_TABLE
Parameters
none
Example
OEBM> show filter protocol_id_table [ENTER]
Filtering Mode:
Protocol ID table mode is FILTER
08-06 08-05
Description
The SHOW FILTER PROTOCOL_ID_TABLEcommand displays the contents of
the protocol id table.
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SHOW FILTER STATIC_ADDRESS_TABLE
Use the SHOW FILTER STATIC_ADDRESS_TABLE command to display the
the MAC addresses in the static address table configured with the filter
type you specify.
Format
SHOW FILTER STATIC_ADDRESS_TABLE {variable}
Parameters
{variable} = always_forward
never_forward_to_port1
never_forward_to_port2
Example
This example shows the command used with the always_forward
parameter.
OEBM> show filter static_address_table always_forward [ENTER]
No entries of this address filter type found.
Description
The SHOW FILTER STATIC ADDRESS_TABLE command displays the MAC
addresses in the static address table configured with the filter type you
specify.
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SHOW LAST_ERROR
Use the SHOW LAST_ERROR command to display information on the last
fatal error that occurred at the local bridge.
Format
SHOW LAST_ERROR
Parameters
none
Example
OEBM> show last_error [ENTER]
Display of Last Error - Flash Version: v2.00
Crash reason: Address Error
-0-
-1-
-2-
-3-
-4-
-5-
-6-
A=0047D35E 004773E4 00402D04 00000000 00000000 00000000 0047D3C4
D=00000001 00200000 000000FF 00000009 00000000 00000000 00000000
PC = 014B30 SR = 2000
Stack Dump
47D308 4E 76 00 00 00 01 4E 75 - 20 00 00 01 4B 30 00 00.Nv.Nu..K0.
47D318 00 00 00 00 00 00 00 00 - 0B B8 00 47 D3 5E 00 00.Copyright.
47D328 00 00 00 00 00 00 00 00 - 00 00 00 01 00 00 00 00.3Com...
47D338 00 00 00 FF 00 00 00 00 - 00 00 00 00 00 00 00 00.Corporatio
47D348 00 00 00 66 00 00 0A 20 - 63 6F 70 79 72 69 67 61.n.1991....
47D358 74 20 31 39 39 31 20 43 - 68 69 70 63 6F 6D 20 43.ONline....
47D368 6F 72 70 6F 72 61 74 69 - 6F 6E oA 20 4F 4E 6C 69...Bridge..
47D378 6E 65 20 42 72 69 64 67 - 65 20 4D 6F 64 75 6C 65...module..
Description
The SHOW LAST_ERROR command displays information on the last fatal
error that occurred. This information may indicate a problem with the
Bridge Module. Log the error information and track the problem. If you
receive fatal errors frequently, call 3Com Technical Support as outlined in
the Technical Assistance section at the end of Chapter 5.
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SHOW SPANTREE
Use the SHOW SPANTREE command to display the current Spanning Tree
information for the local bridge.
Note that the values listed for forward_delay_time, hello_time, and
listen_time are active and in effect ONLY when the local bridge is the root
of the Spanning Tree.
Format
SHOW SPANTREE
Parameters
none
Example
OEBM> show spantree [ENTER]
Spanning Tree Parameters:
Mode
enabled
Bridge Priority
Path Cost Port 1
Path Cost Port 2
Hello Time (sec)
Forward Delay Time (sec)
Listen Time (sec)
Spantree Hello Address:
125
10
10
10
12
22
01-70-C2-00-00-00
Description
The SHOW SPANTREE command displays current Spanning Tree
configuration information.
These parameters are described in detail in the SET SPANTREE section.
Note that the values listed for forward_delay_time, hello_time, and
listen_time are active and in effect ONLY when the local bridge is the root
of the Spanning Tree. Otherwise, the local bridge, as a non-root bridge,
will operate using the values imposed for these parameters by the current
Root Bridge.
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These values (the ones imposed by the current Root Bridge) are displayed
with the MONITOR SPANTREE command as the active HELLO_TIME, active
FORWARD_DELAY_TIME, and active LISTEN_TIME.
Table 4-8 describes the SHOW SPANTREE command attributes.
Table 4-8. SHOW SPANTREE Command Attributes
Attribute
Description
Bridge Priority
The priority of this bridge. The bridge priority is
used with the bridge Ethernet address to
determine which bridge becomes the Root
Bridge in the network.
Path Cost Port1
Path Cost Port2
The value of this parameter determines the path
cost of port 1 or port 2 on the Bridge Module.
The Spanning Tree Protocol seeks to minimize
the path cost between the bridge and the Root
Bridge (called the root path cost). The cost
should be a lower value as the distance between
the bridge and the Root Bridge is lessened.
Hello Time (sec)
The rate (in seconds) at which this bridge, when
it is the Root Bridge, will send out a Multicast
address packet (hello packet). This packet is sent
to all other Ethernet Bridges to let them know
the root is still active.
Forward Delay Time The amount of time (in seconds)that bridges will
(sec)
wait in each Spanning Tree state when moving
from Listening to Forwarding mode when this
bridge is root. The modes that are affected by
this parameter are Listening and Learning.
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Table 4-8. SHOW SPANTREE Command Attributes (Continued)
Attribute
Description
Listen Time (sec)
The amount of time (in seconds)that bridges will
wait for the Root Bridge to send out its Multicast
address packet (hello packet) when this bridge is
root.
Spantree Hello
Address
This is the destination address of the Root
Bridge's Muticast address packet (hello packet).
This packet is sent to all other bridges to let them
know the root is still active.
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SHOW TERMINAL
Use the SHOW TERMINAL command to display the terminal configuration.
Format
SHOW TERMINAL
Parameters
none
Example
OEBM> show terminal
Terminal Parameters:
[ENTER]
Baud
Data bits
Parity
9600
8
NONE
2
Stop bits
Timeout time 0
Hangup
Type
DISABLE
DUMB
Description
The SHOW TERMINAL command displays the current terminal parameters.
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Troubleshooting
5
This chapter provides useful information for diagnosing unexpected results
when using the Bridge Module. It is divided into the following sections:
❑ Applying Power
❑ Power-Up Self-Test
❑ Management Interface
❑ Bridge Operation
❑ Technical Assistance
Applying Pow er
Undernormal conditions, when you installthe Bridge Module, the TESTLED
lights and the TX and RX LEDs illuminate different patterns. Table 5-1 lists
some of the common problems that may arise when installing your Bridge
Module, and their solutions
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.
Table 5-1. Applying Pow er Suggestions
Problem
Troubleshooting Suggestions
All indicators are off. Check that the concentrator is receiving power.
Press the LED check button on the Controller
Module to verify that the LED is not burned out.
All the LEDs should light.
Verify that the Bridge Module is installed
correctlybyfollowing the installation instructions
in Chapter 2.
Pull the Bridge Module out and then slide it back
in, or install the module in another pair of
concentrator slots.
Press the Reset button on the Bridge Module.
Try downloading a new copy of the firmware as
described in Chapter 6. If downloading firmware
doesn't solve the problem, contact 3Com
Customer Support as outlined in the end of this
chapter.
Pow erUp Self-Test
Under normal conditions, the TEST LED stays on during the power-up
self-test (about 20 seconds) and then turns off. If the TEST LED continues
blinking, refer to Table 5-2 for possible solutions
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.
Table 5-2. Pow er-Up Self-Test Suggestions
Problem
Troubleshooting Suggestions
The test indicator
continues blinking.
Press the RESET button on the front panel
to restart the power-up sequence. If the
result is the same, try the next step.
Make sure the AUI loopback connector or
transceiver cable issecurelyattached to the
AUI port.
If transceiver cable is attached to the AUI
port, check the following:
❑ Make sure the transceiver and
transceiver cable are compatible (see
Appendix C).
❑ Make sure the transceiver is receiving
power through the transceiver cable.
Many transceiver models have power
indicators.
❑ Make sure the transceiver is properly
connected to the Ethernet/IEEE 802.3
cable.
❑ Make sure the Ethernet/IEEE 802.3
cable plant is configured correctly, e.g.,
both ends are terminated with 50 ohms.
If all these conditions are met and you still cannot get your Bridge Module
to operate, refer to Appendix E for Technical Assistance.
Troubleshooting 5 - 3
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Management Interface
Follow the directions in Chapter 2 for attaching your terminal to the Bridge
Management Interface. Under normal conditions, the prompt, “OEBM>”
appears on the screen once you press [ENTER]. Table 5-3 lists some
common Management Interface problems that may occur when the Bridge
Module is first set up to communicate with the terminal.
Table 5-3. Management Interface Suggestions
Problem
Troubleshooting Suggestions
Nothing appears on the screen. Make sure the RS-232 cable meets
the specifications listed in Appendix
C.
Make sure the cable is securely
connected to both devices.
Verify that the baud rates, data bits,
and parity match for the terminal and
the Bridge Module.
Characters appear on the
screen, but are garbled.
Check the values of the
communication parameters of both
the Bridge Module and the terminal.
The SETcommand doesn't work. Usethe administratorpassword when
logging on to the bridge. This
activates the SET command. (Note
that the MGMT LED turns on.)
The password doesn't work or
you forgot the password.
Use the FORCE command to override
password protection.
When you use abbreviated
Ensure that you entered enough
input, pressing [SPACE]does not characters for the Management
complete the input.
interface to distinguish between
different commands and options.
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Table 5-3. Management Interface Suggestions (Continued)
Problem Troubleshooting Suggestions
The management prompt on the The Bridge Module is connected to a
screen is not as you set it.
remote device or you did not save the
new prompt. Refer to the
REMOTE_LOGIN and LOGOUT
commands in Chapter 4.
The prompt >> appears on the
screen.
The bridge is operating out of the
Boot PROM code for the Bridge
Module. The Boot PROM code
contains a subset of the operating
code that is contained on the Flash
EPROM. Refer to Chapter 6,
Firmware Download Instructions, for
directions on booting up to the Flash
EPROM version of the bridge code.
Bridge Operation
Once your Bridge has passed the self-test and appears to be working, you
may have some operating questions or problems. Listed below are some
common bridge operation problems and their solutions.
If you can't establish a connection between a node on the port 1
subnetwork and one on the port 2 subnetwork, make sure the network
software running on both nodes is compatible. You should also view the
FWD LED status on the front panel. This LED should be lit when port 1 and
port 2 are communicating.
Troubleshooting 5 - 5
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Technical Assistance
You can receive assistance for installing and troubleshooting the Bridge
Module by calling either your 3Com reseller or 3Com Technical Support. Be
prepared to supply a representative with the following information:
❑ Bridge serial number and Ethernet addresses
❑ Description of the problem
❑ Steps you have taken to try and correct the problem
❑ Type and software version of the ONline network management
module being used
❑ Version of software installed on your Bridge Module
❑ Status of the front panel LEDs
❑ Screen information (if available)
❑ Configuration of your concentrator
(you may find it helpful to refer to the Slot Usage Chart in Appendix B
of the ONline System Concentrator Installation and Operation Guide
for a record of this information)
Refer to Appendix E for instructions on contacting Technical Support for
your product..
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Firmw are Dow nload
Instructions
6
This chapter explains how to download new software to the Flash EPROM
in your ONline Ethernet Bridge Module. New software is provided to
registered owners by 3Com Corporation when new features or
enhancements are available for the module. Contact your 3Com
representative for information and pricing on upgrades.
Dow nload Requirements
The following requirements must be met before you can download
software:
❑ You must have the 3Com Firmware Distribution Kit (Part Number
5000-FDK), including:
–
ProComm Reference Manual (from Datastorm
Technologies, Inc.)
–
–
–
–
–
ProComm diskettes (5 1/4" and 3 1/2" disks)
ProComm software license
3Com diskettes (5 1/4" and 3 1/2" disks)
10 ft. RS-232 cable
25-pin to 9-pin adapter
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❑ You must have the ONline Ethernet Bridge Module Update
DistributionKitfrom3Com (PartNumber5102B-UDK-x.x).The Update
Kit has two versions - limited and unlimited.
The limited version (5102B-UDKL-x.x) allows you to update one Bridge
Module per site and includes:
–
One set of 3Com diskettes (includes a 5 1/4" diskette and
a 3 1/2" diskette)
–
–
–
3Com software license
Installation instructions and a new user manual
Release Notes
Theunlimitedversion(5102B-UDKU-x.x)allowsyou toupdateanunlimited
number of modules and includes:
–
Two sets of 3Com diskettes (each set includes a 5 1/4"
diskette and a 3 1/2" diskette)
–
–
–
3Com software license
Installation instructions and four new user manuals
Release Notes
❑ IBM PC/AT or compatible with either one high-density diskette drive
and a hard drive or two high-density diskette drives
❑ 640K of available RAM on the PC
Caution: The PC used to download the new software must not
be running any background RAM processes, such as
electronic mailsystems, because they will interfere with
the download procedure.
Dow nload Background Information
The Firmware Distribution Kit (FDK) is supplied from 3Com to make system
upgrades fast and easy for all 3Com products that are equipped with Flash
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EPROMs. Thefirst time you update the firmware requires that you purchase
both an FDK and a UDK. All updates after that time require that you have
the new version of the UDK (and the original FDK).
When 3Com issues a software upgrade, the upgrade is sent on diskette
(UDK) to all registered users. The upgrade takes only ten or fifteen minutes,
after which time the Bridge Module will be up and running the new version
of software.
Dow nload Instructions
The instructions for downloading new software to the Bridge Module are
divided into the following steps:
❑ Install the ProComm Software
❑ Connect the RS-232 Cable
❑ Download the new Bridge Module Software
Install the ProComm Softw are
This step installs and configures ProComm software on your PC hard disk or
onto the FDK diskette. The files are installed in the subdirectory PROCOMM
on either the hard drive or on the FDK diskette. Follow the instructions
below:
1. Remove the shrink-wrap from the ProComm package and remove the
ProComm Distribution Diskette.
2. Make a backup copy of both the ProComm diskette and the 3Com
provided diskette (the FDK diskette).
3. Place the 3Com diskette in the floppy drive and change to that drive
by typing a: or b:.
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4. Type the command FDK and press [ENTER] to display the initial
installation screen as shown in Figure 6-1.
*******************************************************************
3Com CORPORATION
Firmware Distribution Kit
Copyright 199X 3Com Corporation
This Firmware Distribution Kit will install and configure ProComm,
a terminal emulation program, on you computer’s hard disk or on a
second floppy drive. The program will reside in the directory
called PROCOMM. Make sure you have the PROCOMM Distribution
Diskette and the 3Com Firmware Distribution Diskette ready at all
times during the installation.
*******************************************************************
Enter the Source Drive :
Enter the Destination Drive :
Enter the COM Port (1-4) :
Start the Installation
Press ENTER to accept the current drive selections and start
the ProComm Installation.
, TAB: Next Field
: Previous Filed
Enter: Accept
ESC: Quit
Figure 6-1. Initial Installation Screen
5. Enter the letter of the source drive where you will be inserting the
ProComm diskette following the “Enter the Source Drive:” prompt.
For a hard drive installation, this is the drive where the current 3Com
FDK diskette is installed. For a floppy disk installation, this is the
second disk drive. Then press the Down Arrow key (↓) or [TAB] to
move the cursor to the next field.
6. Enter the letter of the destination drive where you want ProComm to
be installed following the “Enter the Destination Drive:” prompt. For
a hard drive installation, this is either c or d. For a floppy disk
installation, this is the drive where the FDK disk is installed, either a or
b. Then press the Down Arrow key (↓) or [TAB] to move to the next
field.
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7. Enter the number of the communications port (COM1, COM2, etc.)
to which you will be connecting the RS-232 cable on the PC to
perform the software download following the “Enter the COM Port
(1-4):” prompt. Then press the Down Arrow key (↓) or [TAB] to move
to the next field.
Note: If you are performing a two-floppy installation, follow Step
8. If you are performing a floppy-to-hard drive installation,
follow Steps 9 and 10.
8. Press [ENTER] if the source and destination drive identifiers and the
COM port selection are correct. Then, insert the ProComm diskette in
the appropr-iate drive and press [ENTER] to install and configure
ProComm directly on the FDK diskette. The floppy installation is
complete when the message “INSTALLATION COMPLETE” displays.
Label the FDK diskette as now having ProComm installed so you can
locate this diskette when necessary.
9. Press [ENTER] if the source and destination drive identifiers and the
COM port selection are correct and the installation process begins.
Insert the ProComm diskette into the diskette drive when prompted
as shown in Figure 6-2.
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*******************************************************************
3Com CORPORATION
Firmware Distribution Kit
Copyright 199X 3Com Corporation
This Firmware Distribution Kit will install and configure
ProComm, a terminal emulation program, on you computer’s hard
disk or on a second floppy drive. The program will reside in the
directory called PROCOMM. Make sure you have the PROCOMM
Distribution Diskette and the 3Com Firmware Distribution Diskette
ready at all times during the installation.
*******************************************************************
Insert the ProComm Distribution Diskette in Drive A
Press any key to continue...
Figure 6-2. ProComm Installation Screen
Note: If the message “ProComm directory already exists,
overwrite files?” displays, you have the choice of
overwriting the files or quitting the installation. If you enter
Y to overwrite the files, the existing ProComm files are
deleted and then the new files are copied to the selected
drive.
10. Once ProComm is installed on the hard drive, you will be prompted to
swap in the 3Com FDK diskette as shown in Figure 6-3. Make sure
you place the correct diskette in the disk drive before pressing
[ENTER].
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*******************************************************************
3Com CORPORATION
Firmware Distribution Kit Copyright 199X 3Com Corporation
This Firmware Distribution Kit will install and configure ProComm,
a terminal emulation program, on you computer’s hard disk or on a
second floppy drive. The program will reside in the directory
called PROCOMM. Make sure you have the PROCOMM Distribution
Diskette and the 3Com Firmware Distribution Diskette ready at all
times during the installation.
*******************************************************************
Figure 6-3. Post-ProComm Installation Screen
This last step of the installation loads the ProComm configuration file. The
configuration file sets the parameters that are used by ProComm to
communicate with the Bridge Module. The parameters are as follows:
Note: Baud
Data Bits
= 9600
= 8
Stop Bits
Parity
= 2
= None
COM Port
= (Port number selected in Step 7)
Connect the RS-232 Cable
This step connects your PC to the Bridge Module so you can download the
software to the Flash EPROM. Follow the instructions below:
1. Connect the provided RS-232 cable to the Bridge Module RS-232 serial
port connector on the front panel of the module.
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2. Connect the other end of the cable to the serial port on your PC
(using the provided 9- to 25-pin adapter if necessary). Make sure you
connect the cable to the communications port you specified in the
ProComm install instructions.
Dow nload the New Bridge Module Softw are
This step copies the new Bridge Module software (UDK) to the Flash
EPROM on the Bridge Module. Note that this procedure creates a file called
profile.cmd in the PROCOMM directory. If you currently have a file with
that name, rename it before the UDK download so that it does not get
overwritten.
Warning: Do not interrupt power to the concentrator during the
download process.
Follow the instructions below:
1. Make a backup copy of the 3Com UDK diskette.
2. Place the 3Com diskette in the floppy drive and change to that drive
by typing a: or b:.
3. Type the command UDK and press [ENTER] to display the initial
installation screen as shown in Figure 6-4:
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*******************************************************************
3Com CORPORATION
Update Distribution Kit
Copyright 199X 3Com Corporation
This Update Distribution Kit will start ProCommso you can
download new software to your 3Com device. Make sure you follow
the instructions carefully to avoid downloading the wrong file
to your device. Downloading the wrong file may damage the
device.
*******************************************************************
Enter the Source Drive : a
Enter the ProCcomm Drive :
Start Procomm
c
Press ENTER to accept the current drive selections and start
ProComm.
, TAB: Next Field
: Previous Filed
Enter: Accept
ESC: Quit
Figure 6-4. Initial UDK Installation Screen
4. Enter the letter of the source drive where you inserted the 3Com
diskette following the “Enter the Source Drive:” prompt. Then press
the Down Arrow key (↓) or [TAB] to move the cursor to the next field.
5. Enter the letter of the drive where ProComm has been installed
following the “Enter the Destination where ProComm resides:”
prompt. For a hard drive installation, this is usually c or d. For a floppy
disk installation, this is the drive where the FDK disk is installed, either
a or b. Then press the Down Arrow key (↓) or [TAB] to move to the
next field.
6. If the source and destination drive identifiers are correct, press
[ENTER] to begin the installation process. The first screen that
appears is the ProComm Header Screen, as shown in Figure 6-5.
Firmware Download Instructions 6 - 9
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(R)
Version 2.4.3
Copyright (C) 1985-1988 DATASTORM TECHNOLOGIES,INC. All Rights Reserved
ProComm is user supported software. It is not free, and it is not in
the public domain. You are granted a limited license to use ProComm
for a trial period. If you decide to continue using ProComm, you must
register by sending $50 for registration, disk and manual to the
address below. (Missouri residents please add 6.475% sales tax.)
DATASTORM also publises PROCOMM PLUS. PROCOMM PLUS takes all of the
features of ProComm and adds a greatly expanded “point and shoot”
dialing directories, keyboard re-mapping, user setable COM ports,
enhanced Host Mode with electronoic mail, context sensitive help, 375
page manual, voice technical support, and much more. Contact your
local dealer or call DATASTORM for more information.
DATASTORM TECHNOLOGIES, INC. PO Box 1471, Columbia, MO 65205
314.443.3282
Figure 6-5. ProComm Header Screen
7. Press [ENTER] at this screen. The ProComm Status Line Screen
appears, as shown in Figure 6-6.
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ALT-F10 VT-100 FDX 9600 N81 LOG CLOSED PRT OFF CR CR
Figure 6-6. ProComm Status Line Screen
8. Press [ENTER] to display the Password: prompt, and then log in to the
system with the administrator password. (Note that the MGMT LED
on the faceplate of the unit will light up.)
Note: Before you start the download procedure it is important to
note that the system will prompt you twice for the
Download command. You must enter the Download
command within 10 seconds of the prompts or the
following message is displayed and the download process
is aborted:
The Download command was not entered within 10 seconds.
Please enter the Download command again.
For a quick command reentry, press [CTRL-R]. This command
retypes the previous command string. If the download times-out
before you can enter the key sequence, repeat the Download
command and try again.
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9. Type the following DOWNLOAD command and press [ENTER].
OEBM> maintain download out_of_band
[ENTER]
Warning:
Download will erase your current operational code. You
will need the following to replace the software:
1. PC running Procomm communications software
2. 3Com ONline Bridge Module software media
If you are sure to want to do a download, enter the
Download command again within 10 seconds. Otherwise, this
sequence will be aborted.
OEBM>
10. Type [CTRL-R] within 10 seconds to reenter the complete Download
command.
11. The system will prompt you twice for the password (carriage return)
before the Download process will begin. Press [ENTER] at the
Password: prompts.
Please enter your password to begin the Download process
Password: [ENTER]
Please enter you password again
Password: [ENTER]
Preparing the bridge for download...
12. Once the message “Please enterthe download sequence:<ALT> <F5>
<filename> <CR>” displays, pressthe key combination [ALT-F5]. The
ProComm Pop-Up Menu Screen displays, as shown in Figure 6-7.
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Command FIles
OEBMV212.CMD
Command file:
Password:
OEBM> maintain download out_of_band
Please enter your password to begin the download process
Password:
Please enter your password again
Password:
Preparing the brindge for download...
Please enter the download sequence: <ALT> <F5> <filename> <CR>
ALT-F10 VT-100 FDX 9600 N81 LOG CLOSED PRT OFF CR CR
Figure 6-7. ProComm Pop-Up Menu Screen
13. Press [ENTER] to download the OEBx_xx.CMD file to the Flash
EPROM (where x_xx is the software version). This process takes
approximately ten to eleven minutes at 9600 baud. If you use a
slower baud rate, the download will take much longer.
As the download proceeds, the screen shown in Figure 6-8 is
displayed.
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PROTOCOL:
FILE NAME:
FILE SIZE:
XMODEM
oebmv212.bin
xxxxx
BLOCK CHECK:
TRANSFER TIME:
CRC
xx:xx
BYTES TRANSFERRED: xxxx
BLOCKS TRANSFERRED xxxx
BLOCKS IN FILE:
ERROR COUNT:
xxxx
0
LAST MESSAGE: NONE
OEBM> Maintain download out_of_band
Please enter your passworkd to begin the download process
Password:
Please enter your password again
Password:
Preparing the brindge for download...
Figure 6-8. ProComm Dow nload Screen
When the download completes successfully, a message displays to
that effect and the Bridge Module boots up under the new Flash
EPROM code and displays the ONline Ethernet Bridge Module header.
If error messages are displayed on the screen, refer to the
Troubleshooting section later in this chapter.
14. The download procedure is now complete. Press the key sequence
[ALT-X] and the “EXIT TO DOS? (Y/N)” prompt displays, as shown in
Figure 6-9.
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EXIT TO DOS? (Y/N)
Figure 6-9. Exit ProComm Screen
15. Enter Y to exit from ProComm.
16. Disconnect the cable from the PC and the Bridge Module. The
module is now updated with the new software.
Troubleshooting
This section discusses possible problems you may encounter during the
download process. The problems are divided into ProComm Problems and
Bridge Module Problems.
ProComm Problems
If the problem is not listed in the Bridge Module Problems section below,
refer to the ProComm Reference Manual, Appendix C, Answers To
Firmware Download Instructions 6 - 15
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Commonly Asked Questions, Appendix G, and Chapter 7. Refer also to
Table 6-1 which lists common UDK error messages.
Table 6-1. UDK Error Messages
Message
Troubleshooting Suggestion
Invalid Source or ProComm
Drive Specifications
The drive letter entered where the
UDK program may find the 3Com
distribution diskette, or ProComm is
invalid. The drive letter entered for the
3Com distribution diskette must be 'A'
or 'B'. The drive letter entered where
the UDK may find ProComm cannot be
the same as the drive letter entered to
find the 3Com distribution diskette.
Specified Source Drive is
inaccessible, Drive latch
closed?
The specified drive letter for the UDK
program to find the download files is
inaccessible. Verify the floppy drive
exists, the diskette is inserted, and the
drive latch is closed.
Specified ProComm Drive is
inaccessible
The specified drive letter where the
UDK program is to find ProComm is
inaccessible. Verify the specified drive
exists and ProComm is installed on it.
You must have ProComm to
successfully download
Installation Terminated, press
any key to exit
The UDK program is unable to locate a
ProComm subdirectoryonthespecified
destination drive. Verify that a
directory called \PROCOMM exists on
the destination drive and that the
ProComm files are in it.
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Table 6-1. UDK Error Messages (Continued)
Message
Troubleshooting Suggestion
Fatal Error: Insufficient
Available Memory to run
ProComm
A minimum of 200k bytes of free
memory is necessary to successfully
run ProComm and to do the
download. Decreasing the number of
Terminate and Stay Resident Programs
present while running the UDK
program will free memory.
Fatal Error: Unable to run
ProComm or ProComm not
found
The ProComm subdirectory on the
destination drive either does not
contain ProComm or ProComm has
been corrupted. Verify that the
ProComm files exist on the destination
drive in the subdirectory \PROCOMM.
Bridge Module Problems
Bridge Module problems during the download cause an error statement to
be displayed on the screen. Common error messages and their meanings
are discussed in Table 6-2.
Table 6-2. Bridge Module Dow nload Error Messages
Problem
Troubleshooting Suggestion
Maximum bad CRC
Check RS-232 cable and retry. If the
problem persists, call 3Com Support.
Max timeouts
User did not start the download quickly
enough, try again.
Incorrect code type
Check that you used the correct diskette
and try again. If the problem persists,
call 3Com Support.
Firmware Download Instructions 6 - 17
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Table 6-2. Bridge Module Dow nload Error Messages (Continued)
Problem
Troubleshooting Suggestion
Packet out of sequence
Try again. If the problem persists, call
3Com Support.
Incorrect code version
Flash EPROM overflow
Try again. If the problem persists, call
3Com Support.
Try again. If the problem persists, call
3Com Support.
Flash EPROM program error Try again. If the problem persists, call
3Com Support.
Flash EPROM erase error
Try again. If the problem persists, call
3Com Support.
DRAM write error, could not Try again. If the problem persists, call
write to DRAM 3Com Support.
DRAM verify error, could not Try again. If the problem persists, call
read DRAM 3Com Support.
DRAM CRC errorduring CRC Try again. If the problem persists, call
check failed write to DRAM
3Com Support.
FEPROMCRCdownload CRC
check failed during
download
Try again. If the problem persists, call
3Com Support.
FEPROM initialization error,
could not initialize Flash
Try again. If the problem persists, call
3Com Support.
FEPROM CRC write error
Try again. If the problem persists, call
CRCcheckfailed during write 3Com Support.
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Specifications
A
This appendix lists specifications for the ONline Ethernet Bridge Module.
There are five subsections:
❑ General Specifications
❑ Electrical Specifications
❑ Environmental Specifications
❑ Mechanical Specifications
❑ Hardware Specifications
General Specifications
Baseband Connection: Ethernet or IEEE 802.3 AUI
Backplane Interface: Two 96-pin edge connectors, compatible with the
3Com ONline System Concentrators
Management Connection: RS-232-C, Asynchronous, 300-9600 bps
Specifications A - 1
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Cable Interface: One 15-pin D-subminiature, female Ethernet V2.0 or IEEE
802.3 AUI
One male 25-pin D-subminiature, RS-232-C, DTE
Interconnect Characteristics
Supports IEEE 802.1(d) Spanning Tree Protocol
Filter Rate: 20,000 packets per second
Forward Rate: 10,000 packets per second
Data Rate (maximum throughput): 9.7 Mbps
Filtering Table: Maximum of 8,000 entries
Packet Format: Any valid IEEE 802.3 or Ethernet frame from minimum of
64 octets to maximum of 1518 octets.
Electrical Specifications
Power Requirements: +5V ± 5% ,+12V ± 5% , -12V ± 5%
3.0 Amp for 5V, 0.06 Amp for +12V, 0.03 Amp for -12V
Fuse: 4.0 Amp Fast Blow for 5V
2.0 Amp Fast Blow for +12V
2.0 Amp Fast Blow for - 12V
Power Consumption: 16 Watts
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Environmental Specifications
Operating Temperature: 0° to 50° C (32° to 122° F)
Storage Temperature: -30° to 65° C (-22° to 149° F)
Humidity: less than 95% , non-condensing
BTU/hour: 51.2
Mechanical Specifications
Dimensions: 2.0" W x 10.25" L x 8.5" H
(5.08 cm x 26.04 cm x 21.6 cm)
Weight: 2.0 lbs (0.91 kg.)
Hardw are Specifications
Memory
512 Kbytes of “0-Wait State” SRAM (expandable to 1 megabyte)
256 Kbytes of “Flash” PROM (Field Reprogrammable PROM)
64 Kbytes of Boot EPROM
8 Kbytes of EEPROM (Electronically Erasable PROM)
Special Circuits
ONline Management Interface
Specifications A - 3
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Spanning Tree
Discussion
B
This appendix briefly discusses the Spanning Tree Algorithm and Protocol
(STAP) and how it is used with the Bridge Module. For greater detail about
the internal workings of STAP, consult source books designed for this type
of information, such as the IEEE Draft Standard 802.1(d).
Spanning Tree Terminology
The following terms are used in this appendix:
Root Bridge - The Root Bridge is at the top of the tree structure and is
determined by having the lowest bridge priority/bridge address. Set the
bridge priority through the management commands. Since this value is of
higher precedence than the bridge address, it should be set carefully to
make sure the correct bridge has assumed root status.
Designated Bridge - The bridge responsible for forwarding packets for that
LAN. It is determined by having the lowest “root path cost” for that LAN.
Bridge Address - The Ethernet Address for that Bridge Module.
Root Path Cost - The distance between a bridge and the root bridge is
called the root path cost. The summation of all the port costs of the root
ports of the designated bridges between the bridge and root.
Spanning Tree Discussion B - 1
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Root Port - The port on the bridge with the lowest “root path cost”; the
port closest to the root bridge.
Bridge Operating States:
Forwarding - Active state where the bridge is forwarding packets and an
active member of the network as a designated bridge.
Learning - Intermediate state before “forwarding” where the bridge is
learning the Address Filtering information.
Listening - Intermediate state between “blocking” and “learning” where
the bridge is just monitoring the network.
Blocking - Inactive state where the bridge is only participating in STAP
enough to know when it should move into the “forwarding” state.
Disabled - Inactive state where the bridge is not participating in the
network.
Spanning Tree Overview
The Spanning Tree Algorithm Protocol (STAP) is a method by which bridges
in a connected network configure themselves so as to prevent loops in the
network. The ports on the bridges that are determined to be redundant
are placed into Blocking state, only to be used in case the primary bridge
fails. Consequently, this protocol provides a way of automatically backing
up network connections.
By controlling which ports on which bridgesare active or inactive, the STAP
transforms the network into a tree architecture, eliminating logical loops in
the network. The dotted lines in Figure B-1 show the ports that have been
selected as inactive by the STAP.
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Figure B-1. Spanning Tree Netw ork Architecture
When a bridge is installed into a network, it assumes that it is the root of
the network until it is told otherwise. We will call this bridge BRIDGE_3.
Thinking it is root, BRIDGE_3 transmits packets onto all the networks to
which it is connected, letting adjacent bridges know that it believes it is
root. If an adjacent bridge sees that there is a bridge more deserving of
the title root bridge of the Spanning Tree (i.e., having a lower “bridge
address”), that bridge will inform BRIDGE_3 and it will no longer claim to
be root.
BRIDGE_3 has another chance to enter the hierarchy by becoming one of
the designated bridges. Each LAN has a designated bridge whose role is to
transfer information between that LAN and the root. BRIDGE_3 asks all
the adjacent bridges, except those on its root port, whether it can become
the designated bridge for any of those neighbor's LANs. If BRIDGE_3 is
closer to the root than any of the neighboring bridges on a particular LAN,
then it will become the designated bridge for that LAN. BRIDGE_3 is the
Spanning Tree Discussion B - 3
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designated bridge for the sample shown in Figure B-1 as it forwards
information from LAN 1 and LAN 2 to the Root Bridge (BRIDGE_4).
If BRIDGE_3 is told that it is not the designated bridge, it will go into
blocking state. In blocking state the bridge monitors the network but is not
involved in forwarding packets. BRIDGE_3 then would only become the
designated bridge with a change in the network, for example, if the
designated bridge fails or another bridge is added to the network that
would change the root path cost for BRIDGE_3.
Spanning Tree Example
Figure B-2 shows a Spanning Tree configuration with multiple Bridge
Modules.
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Figure B-2. Configuration With Multiple Bridge Modules
The Midnight Bridge called Bridge A is determined to be the Root Bridge in
this configuration. Bridge B and Bridge E are in blocking state as they were
determined to be redundant in this network.
Spanning Tree Discussion B - 5
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Cable Pinouts
C
This appendix describes the cable pinouts for both transceiver cables and
RS-232 cables. Also described in this appendixare some common problems
you may encounter with your transceiver cables and some suggested
solutions.
This appendix is divided into the following sections:
❑ Transceiver Cables
–
Transceiver Cable Differences
❑ Cable Configuration Rules
–
–
Cable Configuration
Troubleshooting Transceiver Cables
❑ RS-232 Cables
Transceiver Cables
Figure C-1 illustrates the AUI connector on the front panel of the Bridge
Module and Table C-1 shows the proper pinouts for Ethernet V2.0, V1.0,
and IEEE 802.3 AUI cables.
Cable Pinouts C - 1
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Figure C-1. Bridge Module Female AUI Connector
Table C-1. AUI Cable Pin Chart
Pin
IEEE 802.3
V2.0, V1.0
1
CI-S
Shield
2
CI-A
DO-A
DI-S
Collision Presence +
Transmit +
3
4
Reserved
5
DI-A
Receive +
6
V
Power Return
Reserved
c
7
CO-A }
CO-S }
CI-B
8
Reserved
9
Collision Presence -
Transmit -
10
11
DO-B
DO-S
Reserved
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Table C-1. AUI Cable Pin Chart (Continued)
12
DI-B
Receive -
Power +
Reserved
Reserved
13
VP
14
VS
15
C0-B
Shell
Protective ground
Shield terminated to
connector shell
Transceiver Cable Differences
Because AUI Transceiver cables may be built to any of three Ethernet
standards (V1.0, V2.0, and IEEE 802.3), signal differences may occur
between different types of transceiver cables. These three standards also
affect the shielding and grounding of the cables and the size of the wires
used in the cables.
Shielding and Grounding
The most significant difference among AUI cables occurs in the shielding
and grounding of the individual signal and power pairs. IEEE 802.3 and
Ethernet V2.0 specify a requirement for signal isolation due to AC-coupling
of the AUI connection, whereas the V1.0 standard does not include this
requirement.
The three standards specify different techniques for shielding and
grounding:
IEEE 802.3
All shields of the individual signal and power pairs are connected to pin 4.
The overall AUI cable shield is connected to the AUI connector shell to
provide a cable ground. Pin 1 is not used.
Cable Pinouts C - 3
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V2.0
All shields are connected to pin 1 and the AUI connector shell. Pin 4 is not
used. Most Ethernet cables are built this way.
V1.0
Shielding of individual signal or power pairsis not required, since most V1.0
con-trollers and transceivers are DC-coupled. The overall AUI cable shield
provides for shielding and grounding and is connected to pin 1 and the AUI
connector shell.
In practice, most Ethernet V1.0 equipment uses version 2.0 cables due to
cross-talk problems caused by the lack of individual shielding of the pairs in
version 1.0 cables.
Wire Sizes
The three versions of AUI cables also use different wire sizes for the signal
and power pairs. Table C-2 describes the wiring used by each type of
transceiver cable.
Table C-2. Transceiver Cable Wire Sizes
Cable Type
Signal Pair
AWG #22
Pow er Pair
V1.0
AWG #20
AWG #20
AWG #24 *
V2.0 and IEEE 802.3
AWG #20
Non-standard “Office” cable *
AWG #24 *
* more flexible, but is limited to 5.0 meters in length.
Signal deterioration along the signal pairs is most likely to happen as the
AUI cable approaches the maximum length of 40 meters. This signal
deterioration is due to the filtering action of the cable. IEEE 802.3 AUI
cables are designed to reduce this effect.
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Also, since 802.3 AUI cables provide a ground shield isolated from the
signal and power pair's shields, these cables provide additional noise
immunity in noisy operating environments.
Cable Configuration Rules
Refer to the following configuration rules when configuring your network.
1. If the Bridge Module is to be connected to an IEEE 802.3 transceiver,
such as DEC's DESTA™, the transceiver cable must be IEEE 802.3
compliant.
2. If the Bridge Module is to be connected to a non-IEEE 802.3
transceiver, such as DEC's H4000™, the transceiver cable can be
either Ethernet V2.0 or IEEE 802.3 compliant.
3. IEEE 802.3 transceiver cables and Ethernet transceiver cables cannot
be interconnected.
4. A transceiver cable between an Bridge Module and a transceiver
cannot exceed 38 meters (125 feet). This accounts for the Bridge
Module internal cable equivalency of 2 meters (6.5 feet).
5. If you use office transceiver cable, it should not exceed the maximum
transceiver cable distance of 12 meters (39.4 feet).
6. If the configuration includes any other device with internal cabling
equivalency, subtract that amount from the 38-meter maximum. For
example, when connecting the Bridge Module to a configuration that
includes a DELNI, allow 5 meters of cabling equivalency loss for the
DELNI.
Cable Pinouts C - 5
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Cable Configuration
Make sure the transceiver cable does not exceed the maximum lengths
described in Table C-3. Also, follow the configuration rules listed below.
Table C-3. Maximum Cable Lengths
Maximum
Cable Length
From
Baseband
To
Bridge
Cable Type
Ethernet V2.0 or
IEEE 802.3
38 m (125 ft)
Transceiver
Module
Baseband
Transceiver
Bridge
Module
Office Transceiver
Cable (High
Attenuation)
12 m (39.4 ft)
See Cable
Rules
Troubleshooting Transceiver Cables
This section describes some of the more common problems you may
encounter with transceiver cables and some possible solutions.
Symptoms of Bad Transceiver Cables
❑ False or excessive collisions
❑ Jabber condition on Bridge Module
❑ Receive Errors (CRC and Alignment)
❑ Severe degradation of system performance
Causes
❑ Improper grounding (pin 1 vs. pin 4).
❑ Bad ground:
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–
–
Shell connector not crimped onto AUI cable braid.
Ribbon cables in computers not shielded or improperly
mounted.
❑ Broken pair wires or unseated AUI connector pin.
❑ Improper pairing:
–
Verify that signal and power wires are paired, that is,
Transmit + paired with Transmit -, etc.
❑ Individual pairs not individually shielded (Ethernet V1.0 type cable).
Recommendations
❑ The Bridge Module is fully compatible with IEEE 802.3 and Ethernet
V2.0. The use of Ethernet V1.0 AUI cables and transceivers is not
recommended.
❑ The Bridge Module accepts either 802.3 or V2.0 AUI cables. The
proper AUI cable should be used for the appropriate transceiver
being used. That is, if an 802.3 transceiver is used, then use an 802.3
AUI cable.
RS-232 Cables
When you first connect your terminal to the Bridge Module management
interface, make sure it is properly set for asynchronous serial
communication. Figure C-2 illustrates the RS-232 connector on the front
panel of the Bridge Module and shows the proper pinouts for a crossover
RS-232 cable (either female-female or female-male). Table C-4 shows the
proper pinouts for the RS-232 cable.
Cable Pinouts C - 7
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Figure C-2. Management Interface RS-232 Connector and Cable
Pinouts
Table C-4. RS-232 Cable Pin Chart
Pin
DTE
1
Chassis Ground
Transmitted Data
Received Data
← 2
← 3
→ 4
← 5
7
Request To Send (Active Low +12.0V)
Clear To Send
Signal Ground
→ 20
DataTerminalReady(ActiveHigh +12.0V)
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Pow er-Up Self-Test
D
This appendix describes the diagnostic tests run by the Bridge Module upon
power up. This section also explains how to start the Bridge Module
self-test and how to interpret LED and screen displays that result from the
various tests. The last section explains what to do if an error does occur.
Initiating Self-Test
The self-test diagnostic sequence begins any time you perform one of the
following actions:
❑ Plug the module into a powered (live) concentrator
❑ Cycle power on the concentrator
❑ Press the Reset button on the module front panel
❑ Enter the RESET command at the Management prompt
Front Panel LED Display
Under normal conditions, the entire self-test sequence is completed in
twenty seconds or less. At the end of the sequence, all LEDs are OFF. If the
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self-test routine results in an error condition, the TEST indicator blinks and
the remaining LEDs display a code indicating which specific test was
running when the error occurred.
The LED error display uses the top six LEDs on the front panel to create the
Diagnostic Code. These codes are binary representations, where ON is a 1
and OFF is a 0. All of the codes and a brief description are listed in Table
D-1.
For example, suppose the TEST indicator blinks and the front panel
indicators appear as follows:
The first six LEDs represent the Diagnostic Code, which is “100000" .
According to Table D-1, the error occurred within the ROM Test.
Table 4-1. Diagnostic Code Reference
Code
0 0 0 0 0 0
Test
CPU
1 0 0 0 0 0
0 1 0 0 0 0
ROM
Initial Stack
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Table 4-1. Diagnostic Code Reference (Continued)
Code Test
1 1 0 0 0 0 BER (Bus Error Logic)
0 0 1 0 0 0
1 0 1 0 0 0
0 1 1 0 0 0
1 1 1 0 0 0
0 0 0 1 0 0
1 0 0 1 0 0
0 1 0 1 0 0
1 1 0 1 0 0
0 0 1 0 0 1
1 0 1 0 0 1
0 1 1 0 0 1
1 1 1 0 0 1
0 0 0 0 1 0
1 0 0 0 1 0
0 1 0 0 1 0
1 1 0 0 1 0
MFP (Multi-Function Peripheral)
NMI (Non-Maskable Interrupt)
EEPROM
TTY
User
RAM
LANCE1 INTERNAL
LANCE1 Data Transfer
LANCE1 Media
LANCE2 Internal
LANCE2 Data Transfer
LANCE2 Media
Flash
Reset
AF INT (Address Filter Interface)
AF Diagnostic (Address Filter Board Test)
Screen Display
If a terminal is attached to the Management interface, additional
information is displayed on the screen during self-test. As each diagnostic
routine begins, a message appears indicating the name of the routine,
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followed by a left parentheses. These messages start about halfway
through the self-test after preliminary functionality is verified.
For example, when the LANCE 802.3 port test starts, the following appears
on the screen:
lance_1(
When the routine is completed successfully, a right parentheses appears,
followed by the next routine. For example, when the LANCE routine is
completed and the LANCEMEDIA routine begins, the screen display is as
follows:
lance_1 (0123)
lancemedia_1(
When the entire self-test routine is completed, the Bridge Module
identification header is displayed.
When an error occurs, additional information may appear on the screen
depending on the routine running at the time. Be sure you record this
information before calling Customer Support, as described below.
When an Error Occurs
If an error occurs during the Bridge Module self-test, follow these steps:
1. Record the following information:
Diagnostic Code and Subtest Code (all LED values)
Screen display information (if available)
Bridge Module serial number and Ethernet address
Date and time
2. Refer to Chapter 5, Troubleshooting, for information on diagnosing
error conditions.
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If you are unable to correct the condition based on the information in
Chapter 5, contact 3Com Customer Support as explained in the
Technical Assistance section in Appendix E. Please have the recorded
information available when you call.
Power-Up Self-Test D - 5
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Technical Support
E
3Com provides easy access to technical support information through a
variety of services. This appendix describes the following services:
❑ On-line Technical Support
❑ Support from Your Network Supplier
❑ Support from 3Com
❑ Returning Products for Repair
❑ Accessing the 3Com MIB
❑ 3Com Technical Publications
On-line Technical Support
3Com offers worldwide product support through the following on-line
systems:
❑ Email Technical Service
❑ World Wide Web Site
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Email Technical Support
You can contact the Integrated Systems Division (formerly Chipcom) on the
Internet for technical support using the e-mail address
techsupp@chipcom.com.
World Wide Web Site
You can access the latest networking information on the 3Com World
Wide Web site by entering our URL into your Internet browser:
http://www.3Com.com/
This service features news and information about 3Com products,
customer service and support, the 3Com latest news releases, selected
™
articles from 3TECH , the 3Com award-winning technical journal, and
more.
You can contact the Integrated Systems Division on the World Wide Web
by entering our URL into your Internet browser:
http://www.chipcom.com/
There are links between both WWW pages to view information from all
3Com divisions.
Support from Your Netw ork Supplier
If additional assistance is required, contact your network supplier. Many
suppliersare authorized 3Com service partnerswho are qualified to provide
a variety of services, including network planning, installation, hardware
maintenance, application training, and support services.
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When you contact your network supplier for assistance, have the following
information ready:
❑ Diagnostic error messages
❑ A list of system hardware and software, including revision levels
❑ Details about recent configuration changes, if applicable
If you are unable to contact your network supplier, see the following
section on how to contact 3Com.
Support from 3Com
If you are unable to receive support from your network supplier, technical
support contracts are available from 3Com.
For direct access to customer service for Integrated Systems Division
products in:
❑ U.S.A. and Canada - call (800) 724-2447
❑ Asia Pacific - call (508) 787-5151
❑ Europe - refer to the table below. For European countries not listed,
call 31 30 60 299 00
Country
Belgium
Denmark
Finland
France
Telephone Number
0800 71429
800 17309
Country
Netherlands
Norway
Spain
Telephone Number
06 0227788
800 11376
0800 113153
05 917959
900 983125
Sweden
U.K.
020 795482
Germany
Ireland
0130 821502
1 800 553117
1678 79489
0800 966197
800 876-3266
U.S.
Italy
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For access to customer service for all 3Com products, call (800) 876-3266.
You can also contact the Integrated Systems Division (ISD) on the Internet
by using the e-mail address techsupp@chipcom.com.
Returning Products for Repair
A product sent directly to 3Com for repair must first be assigned a Return
Materials Authorization (RMA) number. A product sent to 3Com without
an RMA number will be returned to the sender unopened, at the sender’s
expense.
To obtain an RMA number for Integrated Systems Division products
(formerly Chipcom), use the following numbers.
Country
Telephone Number
Fax Number
(508) 787-3400
No Fax
U.S. and Canada (800) 724-2447
Europe
(44) (1442) 275860
(508) 787-5296
Asia Pacific
(508) 787-3400
Accessing the 3Com MIB
The 3Com Management Information Base (MIB) for the Integrated Systems
Division describes commands that enable you to manage 3Com
SNMP-based products. The MIB is available over the Internet on an
anonymous FTP server. Updates to these MIBs are released as new 3Com
products are introduced.
To access Internet versions:
1. FTP to ftp.chipcom.com(151.104.9.65).
2. Enter the login name anonymous.
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3. Enter your full Internet e-mail address as the password
4. Change to the mib or schema directory using the cd /pub/mibsor
cd /pub/mibs/schemascommand.
5. To view the 3Com MIB, OID, or schema entries, enter the dir
command.
❑ To pause the display, press [CTRL-S].
❑ To continue the display, press [CTRL-Q].
6. Copy the MIB, OID, or schema files to your current directory using the
appropriate command (for example, get chipcom.mib).
7. To exit the FTP session, invoke the quitcommand.
3Com Technical Publications
If you have comments or questions on 3Com Integrated Systems Division
Technical Publicationsdocuments, please contact the TechnicalPublications
group by FAX (508) 229-1551.
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Index
Button, 2-5
Cable Recommendations, C-7
Capabilities, 1-1
Symbols
?
Channel-Select Switch Settings, 2-7
Command Completion, 3-3
Configuration, 3-19
Command, 4-9
Numerics
Configuring, 3-12
3Com Bulletin Board Service (3ComBBS), E-3
Confirming Operation, 2-18
Dip Switch, 2-6
Downloadable Firmware, 1-8
Features, 1-2
A
Accessing Bridge Management, 3-2
Ageing_Time Parameter, 3-20
Dynamic Filtering Table, 3-20
Audience of Manual, xv
Filtering, 3-20
Firmware Download Error Messages, 6-17
Front Panel, 2-4
Getting Started, 3-7
Automatic Modem Hangup, 3-12
High-Performance Design, 1-6
Installation Procedures, 2-9
Installing, 2-1
Interoperability, 1-2
LEDs, 2-5
B
Backplace Connections, 1-11
Baud Rate, 3-10
Logging Out, 3-23
Bridge and Channel Parameters
Setting, 2-15
Bridge Management
Accessing, 3-2
Commands, 3-2
Password Protection, 3-12
Remote Management, 3-19
Bridge Management Commands
Editing, 3-2
Module Extractor, 2-4
Operation, 3-19
RS-232 Port, 2-14
Spanning Tree Loop Control, 1-4
Summarized Installation Procedure, 2-3
Terminal Parameters, 3-10
Traffic Localization, 1-5
TriChannel Architecture, 2-7
Unpacking Procedures, 2-2
Bridge Module Configuration
Sample, 1-10
Entering, 3-2
Bridge Management Interface, 3-9
Bridge Module, 1-1
bulletin board service, E-3
Applying Power, 5-1
Automatic Address Learning, 1-5
Index 1
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Set Bridge Channel, 4-39
C
Set Bridge Dip_Configuration, 4-40
Set Bridge Side_Switch, 4-41
Set Community, 4-42
Set Device, 4-44
Set Device Contact, 4-45
Channel Check Codes, 2-8
Channel-Select Switch Settings, 2-7
Clear Command, 3-23, 4-11
Activating, 3-23
Set Device Device_Gateway_Port1, 4-46
Set Device Device_Gateway_Port2, 4-47
Set Device Diagnostics, 4-48
Set Device IP_Address_Port1, 4-49
Set Device IP_Address_Port2, 4-50
Set Device Location, 4-51
Clear Counter Command, 4-12
Clear Filter Command, 4-13
Clear Last_Error Command, 4-14
Command Completion, 3-3, 4-19
Completion List, 4-20
Command Line
Set Device Name, 4-52
Key Functions, 3-3
Commands
Set Device Password, 3-13, 4-53
Set Device SQE_Mode, 4-55
Set Device Subnet_Mask_Port1, 4-56
Set Device Subnet_Mask_Port2, 4-57
Set Filter, 4-58, 4-59, 4-60
?, 3-4
Clear Community, 4-11
Clear Counter, 4-12
Clear Filter, 4-13
Set Filter Protocol_ID_Table, 4-60
Set Filter Static_Address_Table, 4-61
Set Spantree, 4-63
Clear Last_Error, 4-14
Conventions, 4-1
Force, 4-15
Set Spantree Bridge_Priority, 4-64
Set Spantree Forward_Delay_Time, 4-65
Set Spantree Hello_Address, 4-67
Set Spantree Hello_Time, 4-68
Set Spantree Listen_Time, 4-70
Set Spantree Mode, 4-72
Set Spantree Path_Cost_Port1, 4-73
Set Spantree Path_Cost_Port2, 4-74
Set Terminal, 4-75
Help, 3-4, 4-18
Logout, 3-19, 4-21
Maintain, 4-22
Monitor, 3-22, 4-24
Ping, 4-26
Reference Chart, 4-1
Remote_Login, 3-19, 4-27
Reset Device, 4-29
Revert, 4-30
Set Terminal Baud, 4-76
Save, 3-9, 4-32
Set Terminal Data_Bits, 4-78
Set Terminal Hangup, 4-79
Set Terminal Parity, 4-80
Save Alert, 4-32
Save All, 4-32
Save Bridge, 4-32
Set Terminal Prompt, 4-81
Set Terminal Stop_Bits, 4-82
Set Terminal Timeout, 4-83
Show, 3-5, 4-85
Show Alert, 4-86
Show Community, 4-89
Save Community, 4-32
Save Device, 4-32
Save Filter, 4-32
Save Spantree, 4-32
Save Terminal, 4-32
Set, 3-9, 4-34, 4-35
Set Bridge, 4-37
Show Counter, 4-90
Show Counter Bridge, 4-91
Set Bridge Ageing_Time, 4-38
2 Index
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Show Counter Ports, 4-93
Show Counter Protocols, 4-97
Show Counter Spantree, 4-99
Show Filter, 4-103, 4-104, 4-106, 4-107
Show Filter Dynamic_Address_Table,
4-104
Firmware Distribution Kit, 1-8
Downloading
Firmware, 6-8
Dynamic Filter Table, 3-20
Dynamic Filtering Table, 3-20
Show Filter Mode, 4-105
E
Show Filter Protocol_ID_Table, 4-106
Show Filter Static_Address_Table, 4-107
Show Last_Error, 4-108
Electrical Specifications, A-2
Environmental Specifications, A-3
Error Messages
Show Spantree, 4-109
Firmware Download, 6-17
Establishing Passwords
Show Terminal, 4-112
Summary, 4-3
Administrator, 3-13
Configuring Parameters
User, 3-14
Bridge Module Name, 3-15
Concentrator Reboot Values, 3-16
Contact Name, 3-16
Ethernet Bridge Module
Update Distribution Kit, 6-2
Ethernet Bridge Update Distribution Kit, 1-8
Location, 3-16
Management Prompt, 3-15
Terminal Timeout, 3-16
Configuring the Bridge Module
Parameters, 3-14
F
FCC notice, ii
Filter Tables
Connecting a Terminal
Static Address Filter Table, 3-20
Filtering Parameter, 3-20
Filtering Tables
Dynamic Filter Table, 3-20
Firmware Distribution Kit, 1-8, 6-2
Firmware Download
Background Information, 6-2
Error Messages, 6-17
Instructions, 6-3
Default Terminal Settings, 2-13
Connecting Ethernet Repeaters, 1-3
Connecting Ethernet Transceivers, 1-3
ConnectingOnlineSystem Concentrators, 1-3
Connecting Other Bridges, 1-4
D
Default
Firmware Download Requirements, 6-1
Firmware Downloading
Troubleshooting, 6-15
Force Command, 4-15
Front Panel
Terminal Settings, 3-10
Defaults
Management Prompt, 3-2
Switch Settings, 2-7
Diagnostic Code Reference, D-2
Diagnostics, 1-12
LED Display, D-1
FTP Protocol, 2-18
Bridge Self-Tests, 1-12
CRC Check of Code Memory, 1-12
Port Loopback Tests, 1-12
Downloadable Firmware
Index 3
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MS-DOS Networking Software, 2-18
G
General Specifications, A-1
N
Network Management
H
Capabilities, 1-9
Network Management Capabilities, 1-8
network supplier support, E-2
Hardware Specifications, A-3
Help Command, 3-4, 4-18
O
I
ONline Controller Module
Installation
LED/Channel Check Button, 2-8
ONline Ethernet Bridge Module
Commands, 4-1
ONline Ethernet Management Module
Remote Network Management, 2-9
ONline Ethernet Network Management
Module, 2-7
Precautionary Procedures, 2-1
Installation Procedure, 2-9
Pre-Installation Test, 2-10
Summarized, 2-3
Installing
ProComm Software, 6-3
Instructions
ONline System Concentrator, 1-1
on-line technical services, E-1
ONline Token Ring Managment Module
Remote Network Management, 2-9
Optional Terminal Options, 3-11
Downloading Firmware, 6-3
Interconnect Characteristics, A-2
L
Logout Command, 3-19, 4-21
P
M
Packet Distribution, 1-6
Parameters
Maintain Command, 4-22
Management Interface
Troubleshooting, 5-4
Management Prompt
Customizing, 3-15
Default, 3-2
Ageing_Time, 3-20
Bridge Management Interface, 3-9
Examining, 3-5
Filtering, 3-20
Modifying, 3-6
Overview, 3-9
Faulty, 3-2
Saving, 3-6
Statistics, 3-22
Passwords
Troubleshooting, 5-4
Mechanical Specifications, A-3
MIB, E-4
Administrator, 3-13
User, 3-14
Modem Hangup
Automatic, 3-12
Permanent Filtering
Attributes, 3-21
Monitor Command, 4-2, 4-24
Options, 3-22
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Ping Command, 4-2, 4-26
Power-Up Self-Test, 5-2
Troubleshooting, 5-2
Precautionary Procedures
Electrostatic Discharge, 2-1
ProComm
Screen Display, D-3
Set Bridge Ageing_Time Command, 4-38
Set Bridge Channel Command, 4-39
Set Bridge Command, 4-37
Set Bridge Dip_Configuration Command, 4-40
Set Bridge Side_Switch Command, 4-41
Set Command, 3-9, 4-34, 4-35
Diskettes, 6-1
Reference Manual, 6-1
Software License, 6-1
ProComm Software
Installing, 6-3
Set Community Command, 4-42
Set Device Command, 4-44
Set Device Contact Command, 4-45
SetDeviceDefault_Gateway_Port1Command,
4-46
SetDeviceDefault_Gateway_Port2Command,
4-47
R
Remote Management, 3-19
Remote_Login Command, 3-19, 4-27
Requirements
Downloading Firmware, 6-1
Reset Device Command, 4-29
returning products for repair, E-4
Revert Command, 4-30
RS-232 Cable, C-7
Set Device Diagnostics Command, 4-48
Set Device IP_Address_Port1 Command, 4-49
Set Device IP_Address_Port2 Command, 4-50
Set Device Location Command, 4-51
Set Device Name Command, 4-52
Set Device Password Command, 3-13, 4-53
Set Device SQE_Mode Command, 4-55
Set Device Subnet_Mask_Port1 Command,
4-56
Cable Pin Chart, C-8
Connecting, 6-7
Guidelines, 2-14
Set Device Subnet_Mask_Port2 Command,
4-57
RS-232 Port
SET FILTER Command, 3-20
Bridge Connection, 2-14
Set Filter Command, 4-58
Set Filter Mode Protocol_ID_Table, 4-59
Set Filter Protocol_ID_Table Command, 4-60
SetFilterStatic_Address_TableCommand, 4-61
Set Spantree Bridge_Priority Command, 4-64
Set Spantree Command, 3-20, 4-63
Set Spantree Forward_Delay_Time Command,
4-65
Set Spantree Hello_Address Command, 4-67
Set Spantree Hello_Time Command, 4-68
Set Spantree Listen_Time Command, 4-70
Set Spantree Mode, 4-72
S
Save Alert Command, 4-32
Save All Command, 4-32
Save Bridge Command, 4-32
Save Command, 3-9, 4-32
Save Community Command, 4-32
Save Device Command, 4-32
Save Filter Command, 4-32
Save Spantree Command, 4-32
Save Terminal Command, 4-32
Self-Test Diagnostics
Set Spantree Path_Cost_Port1, 4-73
Set Spantree Path_Cost_Port2, 4-74
Set Terminal Baud Command, 4-76
Set Terminal Command, 4-75
Initiating, D-1
LED Display, D-1
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Electrical, A-2
Environmental, A-3
General, A-1
Hardware, A-3
Mechanical, A-3
Set Terminal Data_Bits Command, 4-78
Set Terminal Hangup Command, 4-79
Set Terminal Parity Command, 4-80
Set Terminal Prompt Command, 4-81
Set Terminal Stop_Bits Command, 4-82
Set Terminal Timeout Command, 4-83
Setting SNMP Values
Static Address Filter Table, 3-20
Alert Settings, 3-18
Community Table, 3-17
T
TCP/IP, 2-18
Default Gateway, 3-18
Technical Assistance, 5-6
Technical Support, 5-6
technical support, E-1
Telenet Protocol, 2-18
Terminal Connections
Configuring, 3-9
Terminal Options
Optional, 3-11
Tranceiver Cables
IP address, 3-17
Subnet Mask, 3-18
Show Alert Command, 4-86
Show Bridge Command, 4-87
Show Command, 4-85
Show Community Command, 4-89
Show Counter Bridge Command, 4-91
Show Counter Command, 4-90
Show Counter Ports Command, 4-93
Show Counter Protocols Command, 4-97
Show Counter Spantree Command, 4-99
Show Device Command, 4-101
Show Filter Command, 4-103
Show Filter Dynamic_Address_Table
Command, 3-21, 4-104
Show Filter Mode Command, 4-103, 4-104,
4-105, 4-106, 4-107
Show Filter Protocol_ID_Table Command,
4-106
Show FilterStatic_Address_Table Command,
4-107
Show Last_Error Command, 4-108
Show Spantree Command, 3-5, 4-109
Show Terminal Command, 4-112
SNMP
Wire Sizes, C-4
Transceiver Cable
Cable Length, C-6
Connecting, 2-14
Transceiver Cables, C-1
Configuration Rules, C-5
Shielding and Grounding, C-3
Troubleshooting, C-6
Troubleshooting
Firmware Download, 6-15
Management Interface, 5-4
Power-Up Self-Test, 5-3
Technical Assistance, 5-6
Transceiver Cables, C-6
U
UNIX
Setting Values, 3-17
SNMP Commands, E-4
Spanning Tree
Host Computers, 2-18
Overview, B-2
Terminology, B-1
Spanning Tree Algorithm and Protocol, 1-4
Specifications
V
VDE compliance, ii
6 Index
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