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Cabletron Systems 3T02-04 manual B.3 SOURCE ROUTING BRIDGING, Figure B-1 Source Routing Example

Models: 3T02-04

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B.3 SOURCE ROUTING BRIDGING

Source Routing Bridging

B.3 SOURCE ROUTING BRIDGING

Source routing bridging (SR) is an alternative to transparent or spanning tree bridging, and is widely used in Token Ring networks. The ATX supports source routing bridging on Token Ring LANs, and an enhancement to source routing called SRT on all LANs.

With source routing bridging, all networked devices participate in the source routing protocol. Each packet that crosses a bridge speciﬁes the originator's LAN segment, the particular bridge, and the destination LAN segment. It may also specify intermediate LAN segments and bridges.

Station A	Bridge B	Station C
Ring		Ring
7		43
	data packet

address

43

B

7

data

Figure B-1 Source Routing Example

In the example in Figure B-1, a data packet traveling from station C on LAN 43 through bridge B to station A on LAN 7 must specify the full route it is to take. The source station is responsible for specifying the route, hence the term “source routing.”

Bridges in a source routing network must be conﬁgured with the LAN numbers (normally 1 to 4095) to which it is connected and a bridge number (normally 1 to 15). The network administrator chooses the numbers; the LAN numbers must be unique in the source routed network and the bridge numbers must be unique between each pair of LANs.

Token Ring Switch Module User Guide

Page B-3

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Cabletron Systems 3T02-04 manual B.3 SOURCE ROUTING BRIDGING, Figure B-1 Source Routing Example

Contents

TOKEN RING SWITCH MODULE 3T02-04 AND 3T01-04 USER GUIDE Page Token Ring Switch Module User Guide VCCI NOTICE Token Ring Switch Module User GuideFCC NOTICE DOC NOTICECABLETRON SOFTWARE PROGRAM LICENSE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITYToken Ring Switch Module User Guide CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENTUNITED STATES GOVERNMENT RESTRICTED RIGHTS Token Ring Switch Module User GuideToken Ring Switch Module User Guide CONTENTSCHAPTER 2 CONNECTING TO THE NETWORK CONFIGURINGToken Ring Switch Module User Guide ContentsCHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTING TECHNICAL SPECIFICATIONSCHAPTER INTRODUCTION 1.1 DOCUMENT CONVENTIONS your email address 1.2 RELATED MANUALS1.3 GETTING HELP anonymous1.4 GENERAL DESCRIPTION Figure 1-2 3T02-04 and 3T01-04 Front Panels 1.6 CONNECTORS1.5 STANDARDS Figure 1-1 ATX Front PanelPage 1.7 LEDsToken Ring Switch Module User Guide Chapter 1 Introduction2.1 INTRODUCTION CHAPTER CONNECTING TO THE NETWORK2.2 POWER-UP LED SEQUENCE Chapter 2 Connecting to the Network 2.3 TYPICAL CONFIGURATIONS2.4 CONNECTING THE TOKEN RING MODULE TO A HUB 2.4.1 Unshielded Twisted Pair2.4.2 Shielded Twisted Pair Figure 2-2 Connecting a Token Ring Module to an STP MAU 3.1 INTRODUCTION CHAPTER CONFIGURING3.3 LCM COMMANDS 3.2 CONNECTING THE LCM3.5 CONFIGURING THE BRIDGING TYPE 3.5.1 Transparent 3.4 SETTING THE RING SPEED3.5.2.2 Segment Number 3.5.2 Source Routing and SRT3.5.2.1 Bridging Method 3.6 TRANSLATION OPTIONS 3.5.2.3 Bridge Number3.6.1 ARP Translation 3.6.3 IPX Translation 3.6.2 Source Routing ARP Translation3.6.4 AppleTalk Translation Off - perform no translation On - translate the packets Page Token Ring Switch Module User GuideChapter 3 Conﬁguring 4.1 DISPLAYING PORT STATUS CHAPTER STATISTICSDisabled - The port is not conﬁgured for Spanning Tree RXQ Overﬂows - number of incoming packets dropped by the port due to a lack of buffers. This entry shows status only it is not selectable. After a reboot, the ATX tries to automatically re-allocate the Small Buffers among the ports so that the total number of RXQ Overﬂows is minimized Forwarding Outcome 4.2 MODULE STATISTICSTable 4-1 Destination Addresses and Forwarding Outcomes Destination AddresssifTxSizes - The number of packets not sent due to size limitations Page Token Ring Switch Module User GuideChapter 4 Statistics 5.1 POWER-UP DIAGNOSTICS 5.1.1 Power-up Tests CHAPTER DIAGNOSTICS AND TROUBLESHOOTINGChapter 5 Diagnostics and Troubleshooting 5.1.2 Power-up Results5.2 OPERATIONAL DIAGNOSTICS 5.2.1 Loopback Tests 5.3 TROUBLESHOOTING 5.3.1 If the Module Fails to Power Up 5.2.2 Diagnostic Results5.3.2 Connectivity Problems CHAPTER ADDING/SWAPPING MODULES 6.1 UNPACKING THE TOKEN RING SWITCH MODULE6.2 ADDING A TOKEN RING SWITCH MODULE Delete all static addresses 6.3 SWAPPING A MODULE Page Token Ring Switch Module User GuideChapter 6 Adding/Swapping Modules APPENDIX A TECHNICAL SPECIFICATIONS DB9 for STP RJ45 for UTP B.1 OVERVIEW APPENDIX B BRIDGING METHODSAppendix B Bridging Methods B.2 TRANSPARENT BRIDGINGFigure B-1 Source Routing Example B.3 SOURCE ROUTING BRIDGINGStation C Figure B-2 Data Path Using Source Routing BridgingStation A B.4 SOURCE ROUTING TRANSPARENT BRIDGING Page B-6 Token Ring Switch Module User GuideAppendix B Bridging Methods INDEX Index-2 Token Ring Switch Module User GuideIndex