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Cabletron Systems 3T02-04 manual B.2 TRANSPARENT BRIDGING, Appendix B Bridging Methods

Models: 3T02-04

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Appendix B: Bridging Methods

Appendix B: Bridging Methods

Exit Port Conﬁguration

	Entry		SRT	SR	TST
	Entry		(Source	SR	(Transparent
	Port	RII	(Source	(Source	(Transparent
	Port	RII	Routing	(Source	Spanning
	Conﬁg.		Routing	Routing)	Spanning
	Conﬁg.		Transparent)	Routing)	Tree)
			Transparent)		Tree)

	SRT	0	spanning tree	block	spanning tree

		1	source route	source route	spanning treea
	SR	0	block	block	block

		1	source route	block	block

	TST	0	spanning tree	block	spanning tree

		1	spanning treea	block	spanning treea

a. source address is not learned

B.2 TRANSPARENT BRIDGING

Transparent or spanning tree bridging requires no initial programming. After being installed on the network, they “learn” and remember the location of the attached devices by reading the source addresses of incoming packets. Then they place the source address and port information in a lookup table.

When a packet comes into a port, the bridge reads the destination address and attempts to ﬁnd the location of the destination node using its lookup table. If the address is in the table, the bridge simply re-transmits the packet out of the appropriate port. If the address is not found in the table the bridge re-transmits the packet out of all the ports except the source port.

Transparent or spanning tree bridges also usually provide some packet ﬁltering capabilities. On some networks it is desirable to prevent certain stations from accessing other segments. The ATX uses this bridging method.

Page B-2

Token Ring Switch Module User Guide

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Cabletron Systems 3T02-04 manual B.2 TRANSPARENT BRIDGING, Appendix B Bridging Methods

Contents

TOKEN RING SWITCH MODULE 3T02-04 AND 3T01-04 USER GUIDE Page Token Ring Switch Module User Guide DOC NOTICE Token Ring Switch Module User GuideFCC NOTICE VCCI NOTICECABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITYToken Ring Switch Module User Guide CABLETRON SOFTWARE PROGRAM LICENSEToken Ring Switch Module User Guide UNITED STATES GOVERNMENT RESTRICTED RIGHTSCONFIGURING CONTENTSCHAPTER 2 CONNECTING TO THE NETWORK Token Ring Switch Module User GuideTECHNICAL SPECIFICATIONS ContentsCHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTING Token Ring Switch Module User GuideCHAPTER INTRODUCTION 1.1 DOCUMENT CONVENTIONS anonymous 1.2 RELATED MANUALS1.3 GETTING HELP your email address1.4 GENERAL DESCRIPTION Figure 1-1 ATX Front Panel 1.6 CONNECTORS1.5 STANDARDS Figure 1-2 3T02-04 and 3T01-04 Front PanelsChapter 1 Introduction 1.7 LEDsToken Ring Switch Module User Guide Page2.2 POWER-UP LED SEQUENCE CHAPTER CONNECTING TO THE NETWORK2.1 INTRODUCTION 2.4.1 Unshielded Twisted Pair 2.3 TYPICAL CONFIGURATIONS2.4 CONNECTING THE TOKEN RING MODULE TO A HUB Chapter 2 Connecting to the Network2.4.2 Shielded Twisted Pair Figure 2-2 Connecting a Token Ring Module to an STP MAU CHAPTER CONFIGURING 3.1 INTRODUCTION3.2 CONNECTING THE LCM 3.3 LCM COMMANDS3.4 SETTING THE RING SPEED 3.5 CONFIGURING THE BRIDGING TYPE 3.5.1 Transparent3.5.2.1 Bridging Method 3.5.2 Source Routing and SRT3.5.2.2 Segment Number 3.5.2.3 Bridge Number 3.6 TRANSLATION OPTIONS3.6.1 ARP Translation 3.6.2 Source Routing ARP Translation 3.6.3 IPX Translation3.6.4 AppleTalk Translation Off - perform no translation On - translate the packets Chapter 3 Conﬁguring Token Ring Switch Module User GuidePage CHAPTER STATISTICS 4.1 DISPLAYING PORT STATUSDisabled - 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 Destination Address 4.2 MODULE STATISTICSTable 4-1 Destination Addresses and Forwarding Outcomes Forwarding OutcomesifTxSizes - The number of packets not sent due to size limitations Chapter 4 Statistics Token Ring Switch Module User GuidePage CHAPTER DIAGNOSTICS AND TROUBLESHOOTING 5.1 POWER-UP DIAGNOSTICS 5.1.1 Power-up Tests5.2 OPERATIONAL DIAGNOSTICS 5.2.1 Loopback Tests 5.1.2 Power-up ResultsChapter 5 Diagnostics and Troubleshooting 5.2.2 Diagnostic Results 5.3 TROUBLESHOOTING 5.3.1 If the Module Fails to Power Up5.3.2 Connectivity Problems 6.2 ADDING A TOKEN RING SWITCH MODULE 6.1 UNPACKING THE TOKEN RING SWITCH MODULECHAPTER ADDING/SWAPPING MODULES Delete all static addresses 6.3 SWAPPING A MODULE Chapter 6 Adding/Swapping Modules Token Ring Switch Module User GuidePage APPENDIX A TECHNICAL SPECIFICATIONS DB9 for STP RJ45 for UTP APPENDIX B BRIDGING METHODS B.1 OVERVIEWB.2 TRANSPARENT BRIDGING Appendix B Bridging MethodsB.3 SOURCE ROUTING BRIDGING Figure B-1 Source Routing ExampleStation A Figure B-2 Data Path Using Source Routing BridgingStation C B.4 SOURCE ROUTING TRANSPARENT BRIDGING Appendix B Bridging Methods Token Ring Switch Module User GuidePage B-6 INDEX Index Token Ring Switch Module User GuideIndex-2