3Com 5102B-EE User Manual

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Page 1

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 Co rporation 118 Turnpike Road

Southbo rough, MA 01772-1886

U.S.A.

(508) 46 0- 8900

FAX (508) 460-8950

Page 2

Federal Communications Comm ission Notice

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment i s operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to rad io communications. Operation of this equipment in a residential area is likely to cause harmful interference , in which case you must correct the interference at your own expense.

Canadian Emissions Requirements

Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe A prescrites dans la norme sur la matériel brouilleur: "Appareils Numériques", NMB-003 édictée par le Ministère des Communications.

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled "Digital Apparatus", ICES-003 of the Department of Communications.

VDE Class B Compl ianc e

Hiermit wird bescheinigt, dass der 5102B-EE in Üebereinstimmung mit den Bestimmungen der Vfg 243/1991 funkentstöert ist.

Der Deutschen Bundespost wurde das Inverkehrbringen dieses Geraetes angezeigt und die Berechtigung zur Üeberprüefung der Serie auf Einhaltung der Bestimmungen eingeräeumt.

Einhaltung mit betreffenden Bestimmugen kommt darauf an, dass geschirmte Ausfuehrungen gebraucht werden. Fuer die Beschaffung richtiger Ausfuehrungen ist der Betreiber verantwortlich.

This is to certify that the 5102B-EE is shielded ag ainst radio interference in accordance with the provisions of Vfg 243/1991.

The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations.

Compliance with applicable regulations depends on the use of shielded cables. The user is responsible for procuring the appropriate cables.

EN55022/CISPR22 Com p lian ce

This equipment conforms to the Class A emissions limits for a digital device as defin ed by EN55022 (CISPR22).

VCCI Class 1 Com pl ia n ce

This equipment is in the 1st Class category (information equipment to be used in commercial or industrial areas) and conforms to the standards set by the V oluntary Control Council for Inter fere nce by Information Technology Equipment aimed at preventing radio interference in commercial or industrial areas.

Consequently, when the equipment is used in a residential area or in an adjacent area, r adio interferenc e may be caused to radio and TV receivers, and so on.

Read the instructions for correct handling.

UK General Approval Statem en t

The ONcore Switching Hub, ONline System Concentrator, and ONsemble StackSyste m Hub are manufactur ed to the International Safety Standard EN 60950 and are approve d in the UK under the Genera l Approval Number NS/G/12345/J/100003 for indirect connection to the public telecommunication network.

Disclaimer

The information in this document is subject to change without notice and should not be construed as a commitment by 3Com Corporation. 3Com Corporation assumes no responsibility for any errors that may appear in this document.

1996, by 3Com Corporation. Printed in U.S.A. All rights r eserved. 3Com is a registered trademark of 3Com Corporation. ONcore is a registered trademark of 3Com Corporation. The information contained herein is the exclusive and confidential property of 3Com Corporation. No part of this manual may be disclosed or reproduced in whole or in part without permission from 3Com Corporation.

Trademarks

Because of the nature of this material, numerous hardware and software products are mentioned by name. In most, if not all cases, these product names are claimed as trademarks by the companies that man ufacture the products. It is not our intent to claim these names or trademarks as our own.

3Com, Artel, Boundary Routing, CardBoard, CardFacts, Galactica, EtherDisk, EtherLink, EtherLink II, EtherLink Plus, LANplex, LANsentry, LinkBuilder, NETBuilder, NETBuilder II, NetFacts, ONcore, ONsemble, ORnet, Parallel Tasking, SmartAgent, StarBridge, T okenLink, Tok enLink Plus, TriChannel, and View Builder are registered trademarks of 3Com Corporation.

ii ONline Ethernet Bridge Module Installation and Operation Guide

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3Com Laser Library, 3Com OpenHub, 3TECH, FDDILink, FMS, G-Man, MultiProbe, NetProbe, OnDeck, ONdemand, ONline, PowerRing, StackJack, StackWay, Star-Tek, SwitchCentral, and Transcend are trademarks of 3Com Corporation.

3ComFacts and Ask3Com are service marks of 3Com Corporation. The 3Com Multichannel Architecture Communications System is

registered under U.S. Patent Number 5,301,303. DEC, DECnet, the Digital logo, DELNI, POLYCENTER, VAX, VT100,

and VT220 are trademarks of Digital Equipment Corporation. IBM is a registered trademark of International Business Machines.

NetView is a trademark of International Business Machines. 3ComFacts, Ask 3Com, CardFacts, NetFacts, and CardBoard are

service marks of 3Com Corporation. 3Com, LANplex, BoundaryRouting, LanScanner, LinkBuilder,

NETBuilder, NETBuilderII, ParallelTasking, ViewBuilder, EtherDisk, Etherl\Link, Ether Link Plus, EtherLink II, TokenLink, T okenLink Plus, and TokenDisk are registered trademarks of 3Com Corporation.

3ComLaser Library, 3TECH, CacheCard, FDDILink, FMS, NetProbe, SmartAgent, Star-Tek, and Transcend are trademarks of 3Com Corporation.

CompuServe is a registered trademark of CompuServe, Inc. 3Com registered trademarks are registered in the United States,

and may or may not be register ed i n other countrie s. Other brand and product names may be reg istered tradema rks or trademark s of their respective holders.

Restricte d Righ ts

Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1) (ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013.

Printed on recycled paper.

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iv ONline Ethern et Bridge Module Inst al lation and Operation Guide

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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

Interoperabili ty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Switch ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Automatic Address Learning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

High-Performance Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Transparent Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Downloadable Fir mware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Network Managem ent C apabil ities . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Media Configur at ion Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

AUI and Backplane Connect ion s . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Backplane Connectio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -11

Diagnostics and Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -12

Contents

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Chapter 2 — Installation

Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Summarized Bridg e Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . 2-3

Module Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Module Extract or . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Te st . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -10

Connecting a Term inal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Connecting to the Bridge M od ule RS-232 Port . . . . . . . . . . . . . 2 -14

Connecting the Transc eiver Cabl e . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -14

Setting Bridge and Channel Parameter s . . . . . . . . . . . . . . . . . . . . . 2 -15

Confirming Bridge Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Chapter 3 — Management Functions

Using Bridge Managem ent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Connecting to the Managem ent 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 Managem ent Param eter Overv iew . . . . . . . . . . . . . . . . . . . . . 3-9

Management Interface Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Configuring the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Setting Bridge Mod ule Terminal Options (Opti onal) . . . . . . . . . 3 -11

Autom atic M odem 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 (Ali as) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -15

Bridge Module Managem e n t Prompt . . . . . . . . . . . . . . . . . . . . 3 -15

Contact Name and Locat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -16

Terminal Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Concentrator Reboot Values . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -16

Setting SNMP Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Community Tab le . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Default Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Subnetwork Ma sk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Alert Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

Remote Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -19

Bridge Module Operat ion and Performanc e (Con figuratio n ) . . . . . . 3-19

AGEING_TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Spantree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Filtering Param eters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

Conventio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 — Firmware Download Instructions

Download Requ irements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Download Backgr ound Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Download Instru cti ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Install the ProComm Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Connect the RS-23 2 Cabl e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Download the New Brid ge Mod ule Soft ware . . . . . . . . . . . . . . . . . . 6-8

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -15

ProComm Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -15

Bridge Module Problem s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -17

Appendix A — Specifications

General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Interconnect Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Environmental Spec ific ation s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Mechanical Specificatio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Special Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Appendix B — Spanning Tre e 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 Gro unding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

Recommendatio n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

RS-232 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7

Appendix D — Power-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 Su pport

On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Support from Your Netw ork Supplier . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3

Returning Products fo r Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4

Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4

3Com Technical Public ation s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Index

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Figures

Figure 1-1. Bridge Module Hardware Design . . . . . . . . . . . . . . . . . . 1-7

Figure 1-2. Sample Bridge Module Configuration . . . . . . . . . . . . . . 1-10

Figure 1-3. Backplane Channel Bridged t o Broadband Segment . . . 1 -11

Figure 1-4. Backplane Channels Bridged Together . . . . . . . . . . . . . 1-12

Figure 2- 1 . Bridge Mod ule Fr ont Pan e l . . . . . . . . . . . . . . . . . . . . . . . 2-4

Figure 2- 2 . Bridge Mod ule and Dip Switc h Lo catio n . . . . . . . . . . . . . 2-6

Figure 2- 3 . Connecting Loopback Connector . . . . . . . . . . . . . . . . . 2-10

Figure 2- 4 . Installing the Bridge Mod ule . . . . . . . . . . . . . . . . . . . . . 2-11

Figure 2- 5. Connecting Transcei ver Cabl e . . . . . . . . . . . . . . . . . . . . 2 -15

Figure 2- 6. Installed Bridge Module . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Figure 6-1. Initial Installation Screen . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Figure 6- 2 . ProComm Installatio n Scr een . . . . . . . . . . . . . . . . . . . . . 6-6

Figure 6- 3. Post-ProComm In stallation Screen . . . . . . . . . . . . . . . . . . 6-7

Figure 6-4. Initial UDK Installation Screen . . . . . . . . . . . . . . . . . . . . . 6-9

Figure 6- 5. ProComm Header Screen . . . . . . . . . . . . . . . . . . . . . . . 6-10

Figure 6-6. ProComm Status Line Screen . . . . . . . . . . . . . . . . . . . . 6-11

Figure 6-7. ProComm Pop-Up Menu Screen . . . . . . . . . . . . . . . . . . 6-13

Figure 6- 8. ProComm Dow nl oad Screen . . . . . . . . . . . . . . . . . . . . . 6-14

Figure 6-9. Exit ProComm Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -15

Figure B-1. Spanning Tree Network Architecture . . . . . . . . . . . . . . . B-3

Figure B-2. Configuration With Multiple Bridge Modules . . . . . . . . . B-5

Figure C -1. Bridge Module Fem ale AU I Conn ector . . . . . . . . . . . . . .C-2

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 Modu le . . . . . . . . . . . . . . . 1-6

Table 2-1. Bridge Module LED s , Button, and Connectors . . . . . . . . . 2-5

Table 2-2. Channel Select Dip Switch Settings . . . . . . . . . . . . . . . . . 2-7

Table 2-3. Channel Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Table 2-4. Power-U p Prob lem Resolu tion . . . . . . . . . . . . . . . . . . . . 2-12

Table 2-5. Bridge Module Default Termin al Settings . . . . . . . . . . . . 2-13

Table 2-6. RS-2 32 Cable Gu idelin es . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Table 3-1. Co mm and Line Key Functions . . . . . . . . . . . . . . . . . . . . . 3-3

Table 3-2. Procedur es for Getting Started. . . . . . . . . . . . . . . . . . . . . 3-7

Table 3-3. Bridge Module Terminal Parameter Options and Factory

Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -10

Table 4-1. Bridge Module Co mman d Index . . . . . . . . . . . . . . . . . . . 4-3

Table 4-2. SHOW BRID G E Com mand A ttri butes . . . . . . . . . . . . . . . 4-88

Table 4-3. SHOW COUNTER BRIDGE Command

Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-92

Table 4-4. SHOW COUNTER PORTS Command Attributes. . . . . . . . 4-94

Table 4-5. SHOW COUNTER PROTOCOLS Command

Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-98

Table 4-6. SHOW C O UN TER SPAN TRE E Com mand Attri butes . . . . 4-1 00

Table 4-7. SHOW D EVICE Co mmand Attributes . . . . . . . . . . . . . . 4-102

Table 4-8. SHOW SPANTREE Command Attributes . . . . . . . . . . . . 4-110

Table 5-1. Applying Power Suggestions . . . . . . . . . . . . . . . . . . . . . . 5-2

Table 5-2. Power-U p Self-Test Suggestio ns. . . . . . . . . . . . . . . . . . . . 5-3

Table 5-3. Managem ent Interf ace Sugge stions. . . . . . . . . . . . . . . . . 5-4

Table 6-1. UDK Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Table 6-2. Bridge Module Dow nload Error Messages . . . . . . . . . . . 6-17

Table C-1. AUI Cable Pin Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Table C-2. Transceiver Cable Wire Sizes . . . . . . . . . . . . . . . . . . . . . . C-4

Table C-3. Maximum Cable Lengths . . . . . . . . . . . . . . . . . . . . . . . . . C-6

Table C-4. RS-232 Cable Pin Chart . . . . . . . . . . . . . . . . . . . . . . . . . . C-8

Table 4-1. Diagno stic Code Refer ence . . . . . . . . . . . . . . . . . . . . . . . D-2

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Page 15

This guide describes the architecture, principal features, operating characteristics, and diagnostic procedures of the ONline™ Ethernet Bridge Module. It also describes the contr ols and indicators of the Bri dge 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:

How to Use This Guide

❑ Network manager or administrat or ❑ Hardware installer

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Structure of This Guide

This guide contains six chapters and four appendices: Chapter 1, Introducti on – Introduces the 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 Modu l e.

Chapter 3, Management Functions – Describes the manag ement capabilities of the Bridge Module, such as setting a password or viewing network statistics.

Chapter 4, Manageme nt Commands – Provides a complete r eference of Bridge Management co mmands, parameters, and values.

Chapter 5, Troubleshooting – Provides help in isolating and correcting problems that can arise during installation and during normal o peration.

Chapter 6, Firmware Download 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, Power-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 organiz at ion and for accessing other product support services.

Index

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Document Conventions

The following document con ventions are used in this manual:

Convention Indicates Example

Courier text User input In the Agent Information Form,

System output After pressing the Apply

enter MIS in the New Contact field.

button, the system displays the message Transmi tt in g da ta .

Bold command string

Italic text in braces User-substituted

Capitalized text in plain brackets

Italics Text em phasis,

Path names Before you begin, read the

identifiers

Keyboard entry by the user

document titles

readme.txt file located in /usr/snm/agents.

Use the following command to show port details:

SHOW PORT {

Type your password and press [ENTER].

Ensure that you press the Apply button after you add the new search parameters.

slot

.all} VERBOSE

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Convention Indicates Example

Note: A Note. The

Caution: A Caution. A

Warning: A Warning. A

The Bridge Module

The Bridge Module is a high-performance bridge that transparently interconnects your facility-wide Ethernet and IEEE 802.3 networks to form a single extended LAN. The Bridge Module fits into your O Nline System Concentrator unit using only two slots and allo ws 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 Protoc ol

Introduction 1 - 1

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❑ Monitor your extended LAN using network management features

including: – Traffic counters – Diagnostic information – Address Table information

Bridge Modu le Featu res

The following section describes the major features of the Bridge Module. These features include:

❑ Interoperability ❑ Spannin g Tree Loop Control ❑ Traffic Localization ❑ Automatic Address Learning ❑ High Performance Design ❑ Transparent Operation ❑ Downloadable Firmware ❑ Network Management Capabilities ❑ Media Configuration Opt ions ❑ Diagnostics and Self-T est

Interoperability

The Bridge Module provides one external 15-pin transceiver cable connector for hookup to an Ethernet and/or IEEE 802.3 subnetwork. If you do not make this external connection, b oth the incoming and outgoing connections are made over the backplane.

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Depending upon the type of bridg e 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

Y ou can connect to another concentrator through the AUI port or through another modu l e 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-LAN Hubs, 10BASE-FB/PC Adapter Cards, or 10BASE-FB Transceiver s.

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 con nected 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 Bridg e Module to interconnec t Ethernet/IEEE 802.3 subnetworks that contain repe aters. 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.

Introduction 1 - 3

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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 wi th more than seven (7) bridge hops between any two nodes .

Y ou can connect the Bridge Module to any of the above devices in various combination s and configurations. Refer to th e section in this c hapter, Media Configuration Options, for configuration examp l es and diagrams.

Note: The Bridge Module is not compatible with Ethernet Version

1 transceivers or cables.

Spanning Tree Loop Control

The Spanning T ree Algorithm and Protocol (ST AP) 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 tha t if the primary bridge fails, a backup bridge will take over within 1 0 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 until needed. While in the blocking state the bridge does not forward packets, but it does continue to monitor and part icipate 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 inclu ded 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 fro m 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 Mod ule does not forward that traffic to the extended LAN, except a s needed.

The Bridge Module allo ws you to set up to 100 dev ice addresses to be always forwarded to or never forwarded to. This can be used to keep sensitive subnetwor k traffic local at all tim es. Enhanced network performance is also gained through the use of this feature.

Topology Switching

T opology 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. T opology switching is performed using the Bridge Module's command interface. The Bridge Module automatically recalculates the Spanning T ree to reorient the bridge in the network.

Automatic Address Learning

When attached to a subnetwork, the Bridge Module dynamically learns the addresses of all nodes on the subnetwork - th us it is called a learning

Introduction 1 - 5

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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 loc ation

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. T able 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 databa se

Not found i n the source subnetwork databa se

High-Performance Desig n

While address filtering can reduce traffic loads on y our network, it is important to overall network integrity for a learning bridge to run as fast as the network. The Bridge Module ensures high 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.

Considered to be local to th a t subnetwork (its source and destination are on the same subnetwork). The Bridge Module does not for ward the packet.

Considered to be on a different subnetwork and forwarded onto the other subnet work (or the destination node has not generated any traffic).

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2. It uses dedicated hardware to accelerate th e 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 Hardware 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 protoco l that runs over IEEE 802.3 LANs, such as Sun Microsystems NFS, Novell Inc. NetWare, 3Com 3+, and other products based on protocols such as XNS, TCP/IP, and ISO.

Introduction 1 - 7

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Downloadable Firmware

As firmware upgrades become available from 3Com, you can download this new firm ware to your Bridge Module using an IBM-compatible PC connected to the module's RS-232 serial port. Downlo adable firmware ensures that you have access to new features as soon as possible - saving the cost, time, and inconvenience of installing new PROM chip s. 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 U pdate 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 o f Bridge Modules.

Network Management Capab ilitie s

You access the Bridge Mod ule management function s through an out-of-band connection via the serial RS-232 port on the front panel. Y ou 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 managem ent workstation.

The Bridge Module offers capabilities to help manage your extended LAN. The primary categories of management functions are:

1. Bridge and N etwork Status Reporting

2. Network Statistic Collection and Repo rting

3. Bridge Address Filter Settings

The reporting and other network management options are described in detail in Chapters 3 and 4.

Media Configura tion Options

The Bridge Module offers two connection alternatives:

❑ One AUI port connector (port 1) and one Backplane channel (port 2) ❑ Two Backplane ch annels (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 norma l maximum len gth and number of stat ions.

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 includes protocol-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 AU I connection)

❑ 8000 meters for broadband (4000 meters on each side of the bridge)

An example of a th ick-cable configuration is shown in Figure 1-3.

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Figure 1-3. Backplane Channel Bridged to Broadband Segment

Backplane Connectio ns

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.

Introduction 1 - 11

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Figure 1-4. Backplane Channels Bridged T ogether

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 Modu le 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 ar e 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 com mand.

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Installation

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 in to 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. F ollow these precaution s 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 numb er 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 an d

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 ANSI terminal to the RS-232 port on the module faceplate

to configure SNMP values and any op tional 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

Reset Button

AUI

RS-232 SERIAL PORT

Female AUI Port

RS-232 Serial Port

Module Extractor

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 bot tom of the module faceplate. Use the module extractor to remove the module from the concen trator.

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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 IEEE 802.3 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 forwar ding state and is

sending packets from that port.

MGMT Indicates that administrator mode o f 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

PORT

RS-232 port for connecting terminal, terminal server ,

PC or modem for Management Interface.

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Dip Switches

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

FWD

MGMT

TEST

RESET

AUI

RS-232 SERIAL PORT

SW1

OFF

On On Off On Off

1 2 3

2 Channel

Off

AUI Port

Off

Isolated

PORT 1

3 4 Channel On On On Off Off

Default Settings

Off On Off

PORT 2

2 3 Isolated

Backplane DIN

Connectors

Figure 2-2. Bridge Module and Dip Switch Location

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Channel-Select Switch Settings

All ONline media modules are equipped with the technology to work with the ONline System Concentrator's unique T riChannel 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 th e Off position and switch es 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 Tab l e 2-2.

Table 2-2. Channel Select Dip Switch Settings

Port 1 Switch 1 Switch 2 Port 2 Switch 3 Switch 4

Channel 1 On On Channel 1 On On Channel 2 On Off Channel 2 On Off AUI Port Off O n Channel 3 Off On Isolated Off Off Isolated Off Off

If you have an ONline network management mod ule installed in your concentrator , you can remotely override these switch settings. Refer to the appropriate ONline Management Module Installation and Operation Guide for informatio n 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 th e Bridge Module from anoth er device

LED and Channel Verification

The ONline Controller Module is equipped with an LED check but ton on the front panel. The LED check button has two functions: it causes all LEDs in all modules in the con centrator 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 continu es 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

1 Blink Port is configured for

2 Blinks Port is configured for

4 Blinks Port is configured to

Off Port is isolated Off Port is isolated

2 - 8 ONline Ethernet Bridge Module Installation and Operation Guide

Port 1 Configuration

channel 1

channel 2

the AUI connec tor

Port 2

LEDs

1 Blink Port is configured for

2 Blinks Port is configured for

3 Blinks Port is configured for

Port 2 Configuration

channel 1

channel 2

channel 3

Page 41

Remote Network Management

The ONline Ethernet Management Module (EMM) and ONline T oken Ring Management Mo dule (TRMM) provide remote networ k ma nagement 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 th e appropriate ONline Management Module Installation and Operation Guide fo r additional information on network management features.

You can also log into the Bridge Mo dule 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.

Installatio n Procedures

Y ou do not need to power down the ONline System Concentrator to install the Bridge Mo dule. You can insert the module w hile 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 th e Bridge Module into the concentrato r, the unit performs a self-test to verify proper operation of the internal hardware and communicatio n interfaces. To test the un it 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 Brid ge 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 T est LED on the front panel remains lit. Various LED combinations appear during the self-test. If the power- up self-test is successful, the Test LED goes off after approximately 20 seconds and the module returns to the configuration set up by the dip swi tches and the TX LED w ill 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. Power-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 blin king 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 Append ix E.

If these alternatives fail to f ix the problem, your un it is mal functioning. 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. Y o u can connect any device that presents an ASCII asyn chronous 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 per form brid ge 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. Y ou 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 bi t s to the Bridge Modu l e factory defaults as shown in Table 2-5.

Table 2-5. Bridge Module Default Terminal Settings

Parameter Factory Setting

Baud 9600 Data_bits 8 Parity None Stop_bits 2 Flow Cont rol XON/X OFF

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Once you have configured your terminal to match the factory defaults of the Bridge Mo dule, you can connect a cable from the terminal to the RS-232 port on the Bridge M odule.

Connecting to the Bridge Module RS-232 Port

The RS-232 cable connects to the management interface on the Bridge Module front panel. T able 2-6 defines general cabling guidelines that apply for connecting various devices to the management interface..

Table 2-6. RS-232 Cable Guidelines

Device Cable

Terminal Female-to-fema le crossover

Female-to-male crossover Modem Male-to-female straight-through Terminal Server Refer to Supplier Documentation

Note: The 3Com Firmware Distribution Kit (5000-FDK) provides a

cable for connec tion 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 referrin g to Figure 2 -5:

1. Push the slide latch to t he up position.

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2. Plug the transceiv er cable into the jack.

3. Firmly push the slide latch down until it snaps into the locking position.

4. Gently p ull on the connector to make sure the latch is secure.

3Com recommends strain relief for this cable to avoid placing undue stress on the connec tor.

AUI

RS-232 SERIAL

Figure 2-5. Connecting Transceiver Cable

Setting Bridge and Chann el Para meter s

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 in stallation.

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 addr ess filtering attributes (hard-coded addresses that ar e not to be forwarded to, or that should always be forwarded to) using the SET FILTER com mand. At this time you shou ld 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 y ou set the channels through management (through a network management module or from Bridge Module Management) you need to issue the command as shown below to ensure that in the fu ture, the Bridge Module configures from the values in memo ry:

OEBM> set bridge dip_configurat ion disable [ENT ER ] OEBM> save bridg e [ENTER ]

4. Select the channels th at t he module will bri dge 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 m anagement module,

issue the SET PORT NETWO RK command. For example, the command belo w sets port 1 of a Bridge Module in slot 5 to backplane network 1. Refer to the appropriate ONl ine Management Module Installation and Operation Guide for a complete description of the S ET 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 T able 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

Y o u 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 dep en ding on your application:

❑ If your application uses MS-DOS networking software such as Digital

Equipment's DECnet™-DOS or PCSA, Novell's NetWare, or 3Com's 3+, 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 T elnet protocol, or to transfer a file using th e FTP protocol.

❑ If your application accesses DEC VAX™ hosts using LAT, attempt to

establish a terminal con nection.

❑ Issue the PING diagnostic command t o verify whether the Bridge

Module is active .

Follow the steps listed above to send packets across the Bridge Module and watch the front panel indicators to verify the packets are being transmitted and received.

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Management Functions

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 Bridg e M od ule.

You can use Bridg e Management to:

❑ modify the configuration of your Bridge Module to suit your specific

application

❑ customize filtering attrib utes ❑ display information about the network and local or remote b ridge

status

❑ display packet count er s and network errors ❑ download new firmware to your Bridge Module (Chapter 6)

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Using Bridge Man age men t

This section explains how to access Bridge Management, enter an d 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 so ftware enables you to execute M an agement

commands regardless of bridgin g 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 Interf ace (RS-232 port ).

Entering and Editing Commands

You manage the Bridge Module by entering comm ands 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 runnin g off the Boot PROM (a subset of the operational code). Type the HELP comman d 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] Enters the command. [SPACE] Completes a com m and through command

completion.

[CTRL-C] Returns to a blank command line (management

prompt) at any time. [CTRL-R] Retypes the previous command string on the

command line. ? Displays the available commands or command

options.

Command Com p letion

Bridge Management accepts abbreviated com m a nd input throug h a feature called Command Completion. With Comm and Comp letion you need only type the minimum number of letters required to distinguish the command or argument from other acceptable choices and press the SP ACE bar to complete the com m and. An example of command comp letion 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 Managem ent. 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 |

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 command s, arguments, or parameter values.

The Bridge Module management interface provides you with co mmands that enable you to examine, modify, and save param eters. 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 SP ANTREE command displays the current spanning tree parameters, as show n below.

OEBM> show spantree [ENTER]

Spanning Tree Parameters: Mode Enabled Bridge Priority 0 Path Cost Port 1 10 Path Cost Port 2 10 Hello Time (sec) 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 Serial Number: 330658 Restarts: 7

Flash EPROM Version: v2.0 Service Date: / /

Location: 3rd Floor Engineering

Port 1 Port 2

MAC Address: 08-00-8F-10-17-48 08-00-8F-10-17-49 IP address 127.0.0.1 127.0.0.1 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. Y ou must first type the administrator password when you log in to the management interface. The administrator password provides access to commands that allo w you to modify the cur rent 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 Parame ter s

When you reboot the system, all paramet ers 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 co mman d befo re 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 co ncentrator.

Note: If a power failure occurs within the concentrator, all

unsaved parameter values are lost.

Getting Started

This section briefly describes the steps to f ollow once the Brid ge 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 Parameter Overview, describes each step in detail.

Table 3-2. Procedures for Getting Started

Procedure Command Priority

1. Configure your

terminal to default Bridge Module communication settings

2. Configure the Bridge

Module

❑ Set administrator

password

Refer to your terminal vendor's docum entation

SET DEVICE PASSWORD ADMINISTRATOR

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Table 3-2. Procedures for Getting Started (Continued)

Procedure Command Priority

❑ Set user passwords SET DEVICE P ASSWORD

USER

❑ Set the Bridge

Module: Name, Management Prompt, Location

SET DEVICE NAME SET TERMINAL PROMPT SET DEVICE LO CATION SET DEVICE CONTACT

Contact information

❑ Set Terminal Timeout

SET TERMINAL TIMEOUT Recommended

value

3. Configure Bridge

Module SNMP values:

❑ Set the Bridge Module:

IP Address, Community Table, Default Gateway, Subnetwork M a s k, and Alert Settings

SET DEVICE IP_ ADDRESS SET COMM UNITY SET DEVICE DEFAULT_GATEWAY SET DEVICE SUBNET_MASK SET ALER T

4. Configure Spanni ng

SET SPANTREE... Recommended

Tree Parameters

Reco mmended

Recommended

Mandatory if you plan to manage via SNMP or use the PING command

5. Save all configuration

SAVE ALL Mandatory

values you set

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Bridge Management Parameter Overview

Bridge Management parameters fall into five general categories:

❑ Management Interface ❑ Remote Management ❑ Bridge Module Operation and Perform ance (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 par ameters control the configuration of the Bridge Management Interface:

❑ Te rminal 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 y ou m ust 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 termi nal and the bridge can communicate.

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These parameters settings include the terminal's baud 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 mod ule 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 baud rate and then press [ENTER] to regain access to the module. Y ou may then use the SAVE TERMINAL command to save the new baud rate.

Your terminal settings must match the bridge factor y default values as shown in Table 3-3.

Table 3-3. Bridge Module Termi nal Parameter Options and Factory

Defaults

Parameter Options

Baud 300, 1200, 2400, 4800, 9600 9600 Data_bits 7 or 8 8 Parity odd, even, or none none Stop_bits 1 or 2 2

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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:

Press [ENTER] and the Password prompt is displayed.

Password: [ENTER]

Initially the default password is a null string. You must enter a pas sword 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 pr ompt, 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 co nnect 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 th e SE T comma nd 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 value s 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 auto matically hang up a modem. The following example shows the command used to automatically hang up the modem once you log o ut of the Bridge Module.

OEBM> set terminal hangup enable [ENTE R]

Note: If you fail to hang u p the modem connection, an

unauthorized user m ay pick up the last login session.

Configurin g t he Bridge M od ule

Now that the terminal settings are complete, you can configure the Bridge Module in the c oncentrator. We recomm e nd that you com plete the following steps when you log in for the first tim e:

1. Establish passwords

2. Configure other Bridge Module par am eters

3. Set Bridge Module SNMP value s

Establishing Passwords

Bridge Management provides a password-protection capability that allows you to control access to certain commands and information. Y ou 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 passwo rds can con tain 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 provides access to all Bridge Module com m ands, 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 o n 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 Password

Use the SET DEVICE PASSWORD AD MIN ISTRATOR command at the management prompt to establish the administrator passw ord.

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 Password

Use the SET DEVICE PASSWORD USER co mmand at the management prompt to establish a user password. Note that you must be logged in as the administrat or to change the user password.

OEBM> set device password user [ENTER] Enter current administrator password: <current password> [ENTER]

New password: <new user password> [ENTER] Verify: <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 Modu l e, for example the Brid ge 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 Bridg e Module s 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 man ner you can log into a remote Bridge Module by issuing the REMOTE_LOGIN NAME <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 in clude 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_LOG IN and LOGOUT command s and the Remote Management section in this chapter for more information on remote management.

Note: 3Com recommends that y ou 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 Br idge Module.

Terminal Timeout

You should set the terminal time out value to specify the amount of time your terminal will remain logged in without any keyboard ac tivity. 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 SE T TERMINAL TIMEOUT command to set the timeout period in minutes.

Concentrator Reboot Values

When the Bridge Module is reset (or rebooted) using the factory d efault settings, the module performs a full diagn ostic 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 diagnosti cs if you want the Bridge Module to boo t up faster. You also have th e 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 DISAB LE com mand to bypa ss 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 Gateway

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]

Subn etwork Mask

The subnetwork mask is specific for each type of Internet class. In general, the subnetwork mask is a 32-bit IP a ddress wit h all ones (1) in the network and subnetwork portions of the address and zeroes (0) in the host portion. The subnetwork mask is input as four pairs of hexadecimal digits 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 manageme nt workstation. Refer to t he 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 T ree topology change is detected.

OEBM> set alert change enable [ENTER]

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Remote Managem ent

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 LOGI N command will affect bridging performance for the duration of the remote conn ection.

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 performed on the remote Bridge Module.

Disconnect from the remote Bridge Module by issuing the LOGOUT command.

Bridge Module Operatio n and Performance (Con figuration )

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 fr om the dy na mic 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 Tr ee 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 info rmation on the Spanning Tree Algori thm and Protocol.

Filtering Parameters

Filtering is an important capability of the Bridge Module because it allows particular nodes to 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 learns the 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 t he bridge forwards the packet accordingly . (Use the SHOW FIL TER DYNAMIC_ADDRESS_TABLE command to list all dynamic addresses known b y each port.)

Static Address Filter Table

The SET , CLEAR, and SHOW commands allow you to establish, re move, and display permanent filtering attributes for specific nodes. The SET command establishes a permanent entry in the static address filter table: an entry which is never “aged out." This can imp rove network performance by controlling the flow of packets based on your specific network topology and traffic patterns.

For example, the fo llowing comm and tells the Bridge Module to never forward packets to 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 commands are discussed briefly in the following paragraphs. Chapter 4 provides complete descri pti on and examples of these commands.

SHOW

The SHOW command displays current bridge attributes. Y ou must use one of the SHOW command parameters to display bridge attributes. Several of the SHOW comman d 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 bas ed upon the mon itor rate that you request. This co mmand 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 occu r. 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 cu rren t 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. T o 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.

Lo gg ing Out

When you are done using the Bridge Module, SAVE all your changes and then log out to prevent unauthorized use of the module. Y ou 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 me ssage will display:

OEBM> logout [ENTER] Bye

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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

This chapter provides a complete alphab etized 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 comma nds regardless of bridging activi ty. Therefore, bridging performance will b e affected for the duration of the command execution.

Conventions

The following conventions are used in the command descriptions contained in this chapter:

The management prompt is indicated as “OEBM> .” User input is indicated as lower-case underlined text. For example,

device

Responses from the Bridge Module appear as they do on your terminal screen.

set terminal ba ud

show

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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 comman d 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. Onl y 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 M odule commands, their parameters, and the page number where they are located in this chapter . This list is compiled by co mmand type: General, Configu ration, Status, Statistics, Maintenance, and Special.

It is important to note that there are specific Bridge Module com mands that must be used with caution. If used improperly , these commands have the potential to disrup t the network. These commands are marked in Table 4-1 with an asterisk (*). Read the command descrip tions carefully before executing any of these commands.

Table 4-1. Bridge Module Command Index

Command T ype Command Parameters Page

General ? {Bridge command} ? 4 - 9

HELP {Bridge command} 4 - 19 LOGOUT none 4 - 22

Management Commands 4 - 3

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Table 4-1. Bridge Module Command Index (Continued)

Command T ype Command Parameters Page

Configuration CLEAR community 4 - 12

counter 4 - 13 filter 4 - 14 last_error 4 - 15

REVERT alert 4 - 33

all * 4 - 33 bridge * 4 - 33 community * 4 - 33 device * 4 - 33 filter * 4 - 33 spantree * 4 - 33 terminal 4 - 33

SAVE alert 4 - 35

all 4 - 35 bridge 4 - 35 community 4 - 35 device 4 - 35 filter 4 - 35 spantree 4 - 35 terminal 4 - 35

SET ALERT authentication 4 - 38

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Table 4-1. Bridge Module Command Index (Continued)

Command T ype Command Parameters Page

Configuration

(continued)

change 4 - 38 hello 4 - 38

SET BRIDGE ageing_time 4 - 41

channel * 4 - 42 dip_configuration 4 - 43 side_switch_mode 4 - 44

SET COMMUNITY community name

4 - 46 ip_ address access (all are required)

SET DEVICE contact 4 - 50

default_gateway_port1 4 - 51 default_gateway_port2 4 - 52 diagnostics 4 - 53 ip_address_port1 * 4 - 54 ip_address_port2 * 4 - 55 location 4 - 56 name 4 - 57 password 4 - 58 sqe_mode 4 - 60 subnet_mask_port1 4 - 61 subnet_mask_port2 4 - 62

SET FILTER mode protocol_id_table 4 - 64

Management Commands 4 - 5

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Table 4-1. Bridge Module Command Index (Continued)

Command T ype Command Parameters Page

Configuration (continued)

SET FILTER (cont.) protocol_id_table 4 - 66

static_address_table 4 - 67

SET SPANTREE* bridge_priority * 4 - 70

forward_delay_tim e * 4 - 71 hello_address * 4 - 73 hello_time * 4 - 75 listen_time * 4 - 77 mode * 4 - 79 path_cost_port1 * 4 - 80 path_cost_port2 * 4 - 81

SET TERMINAL baud 4 - 83

data_bits 4 - 85 hangup 4 - 86 parity 4 - 87 pro mpt 4 - 88 stop_bits 4 - 89 timeout 4 - 90

Status SHOW ALERT none 4 - 93

SHOW BRIDGE none 4 - 94 SHOW

none 4 - 96

COMMUNITY SHOW COUNTER bridge 4 - 98

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Table 4-1. Bridge Module Command Index (Continued)

Command T ype Command Parameters Page

Status (continued)

SHOW COUNTER (cont.)

ports 4 -

100

protocols 4 -

104

spantree 4 -

106

SHOW DEVICE none 4 -

108

SHOW FILTE R dynamic_address_table 4 - 111

mode 4 - 112 protocol_id_table 4 - 113 static_address_table 4 - 114

SHOW LAST_ERROR

SHOW SPANTREE n one 4 -

SHOW TERMINAL none 4 - 119

Statistics M ONITOR

(mm:ss)

none 4 - 115

116

bridge 4 - 25 ports 4 - 25 protocols 4 - 25 spantree 4 - 25

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Table 4-1. Bridge Module Command Index (Continued)

Command T ype Command Parameters Page

Maintenance MAINT AIN download out_of_band 4 - 23

PING ip_address 4 - 28 RESET DEVICE name 4 - 28

none 4 - 32

Special FORCE none 4 - 16

REMOTE_LOGIN ip_address 4 - 30

mac_address 4 - 30 name 4 - 30

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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 d isplays the list of Bridge Module co mmands 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 d isplays the list of Bridge Module co mmands available under the user passwo rd. 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 d isplay 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 tab l e . This comm and is only available in ad m inistrator mode.

Format

CLEAR COMMUNITY {commu ni ty num ber}

Parameters

{community number} = 1 - 10 or all

Example

OEBM> clear community 3 [ENTER] Commu ni ty 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 comman d 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 pro tocols spantree

Example

OEBM> clear counter bridge [ENTER] Done

Description

The CLEAR COUNTER co mmand 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 FIL TER command to clear an entry from 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}

Example

OEBM> clear filter protocol_id_table 0800 [ENTER] Proto co l ID de le te d from filt er 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.

static_address_table {MAC address}

Description

The CLEAR FILTER command enables you to clear entries from the static address table and the protoc ol id table.

It is recommended that you use the CLEAR FIL TER 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 com mands after modifying the tables for the changes to take effect.

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CLEAR LAST_ERROR

Use the CLEAR LAST_ERROR co m m and 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_ERRO R command in co njunction with the SHOW LAST_ERROR command to v iew 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 passwo rd - requiring you to be physic ally located at the concentrator where the module is installed.

T o 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 s equences, the Bridge Module displays the m essage “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 i nterpretation 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 adm inistrator password retained. Yo u will then need to repeat the FORCE command to retry the LED interpretation.

Example

T o success fully 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 d igit 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 bridg e prompt. If you

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successfully interpret the first LED pattern, a second patter n 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 previous page translates into 01011111, which is 5f in hexadecimal notation. Likewise, the LED sequence for the secon d illustration translates into 01101100, which is 6c in hexadecim al 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 co ntain the possible completions that a user may enter. When in administrator mode, this list will contain all possible command completi ons.

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 typ ing “?.” For example, when you type SET ?, the following com pletion 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 loc a l or remote login session.

Format

LOGOUT

Parameters

none

Example

Logging o ut from a local B ridge Modul e:

OEBM> logout [ENTER] Bye

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 m aintenance 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

If you are sure you want to perform a download, you must enter the DOWNLOAD command again within 10 seconds. Otherwise, the download sequence will be aborted. You will then have to reenter the Download command to restart the process.

OEBM> maintain download out_of_band [ENT ER]

For a quick command reentry, press the [CTRL-R] sequence, which will retype the previous command stri ng 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: Passw or d: [ENTER]

Please enter your password again Passw or d: [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. Y ou will need the following item s to replace the software:

1. 3Com Firmware Distribution Kit (part number 5000-FDK)

2. ONline Eth e rnet 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 rep ort ed periodic ally based upo n the time that you request.

The MONITOR command parame ter 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 d isplays.

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 c ommand for the default time period of five minutes or longer to minimize thi s impact.

Format

MONITOR {interval} {group}

Parameters

{interval} = 0:05 - 30:00 (default is 5:00) {group} = bridge (default)

ports protocols span tree

Example

This example displays Spanning Tree statistics every thirty seco nds.

OEBM> monitor 0:30 spantree [ENTER] 145 Seconds Since Clear Port 1 Port 2

Spanning Tree State FORWARDING FORWARDING Spann ing Tree Fr ames Rece ived 0 0 Spanning Tree Frames Transmitted 0 0

Port Independent Statistics Topology Change Count 2 Seconds Since Topology Changed 114

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Active Hello Time 2 Active Forward Delay 15 Active Listen Time 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 Port 1 Port 2

Unicast Packets Received 0 0 Non-Unicast Packets Received 0 0 Unicast Packets Transmitted 0 0 Non-Unicast Packets Transmitted 0 0

Press CTRL-C to exit.

Description

The MONITOR command periodically displays the network and bridging statistics for the channels to wh ich t he 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 {Inter net Protoc ol 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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