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Cabletron Systems 3T02-04 manual Figure B-2 Data Path Using Source Routing Bridging, Station A

Models: 3T02-04

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Station A

Appendix B: Bridging Methods

Source routing workstations need not be conﬁgured with route information; instead they discover the best route to a destination through the use of explorer frames. In the Figure B-1 example, station C might ﬁrst transmit an empty explorer frame. Bridge B would add 43-B-7 as its portion of the route, and then transmit the explorer on all other LANs. When the packet reaches station A, it can reverse the route to send a reply back to C. When C receives the reply, both stations have all of the routing information needed to converse, with no further explorer frames needed.

Part of the original intent of source routing bridging was to enable LANs to be richly connected by low-performance, low-cost bridges. As shown in Figure B-2, source routing allows an end station to choose a less-congested path through a chain of bridges, where each bridge is likely to become congested.

Station A

Station C

Congested

Alternative Route

Figure B-2 Data Path Using Source Routing Bridging

In contrast to spanning tree bridging, all bridges and all links are active with source routing bridging; the least-congested path is chosen at discovery time. With products like the ATX, such congestion avoidance is rarely necessary, since the bridge is capable of handling nearly any trafﬁc load without experiencing congestion.

Page B-4

Token Ring Switch Module User Guide

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Cabletron Systems 3T02-04 manual Figure B-2 Data Path Using Source Routing Bridging, Station A, Station C

Contents

TOKEN RING SWITCH MODULE 3T02-04 AND 3T01-04 USER GUIDE Page Token Ring Switch Module User Guide Token Ring Switch Module User Guide FCC NOTICEDOC NOTICE VCCI NOTICEEXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY Token Ring Switch Module User GuideCABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT CABLETRON SOFTWARE PROGRAM LICENSEToken Ring Switch Module User Guide UNITED STATES GOVERNMENT RESTRICTED RIGHTSCONTENTS CHAPTER 2 CONNECTING TO THE NETWORKCONFIGURING Token Ring Switch Module User GuideContents CHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTINGTECHNICAL SPECIFICATIONS Token Ring Switch Module User GuideCHAPTER INTRODUCTION 1.1 DOCUMENT CONVENTIONS 1.2 RELATED MANUALS 1.3 GETTING HELPanonymous your email address1.4 GENERAL DESCRIPTION 1.6 CONNECTORS 1.5 STANDARDSFigure 1-1 ATX Front Panel Figure 1-2 3T02-04 and 3T01-04 Front Panels1.7 LEDs Token Ring Switch Module User GuideChapter 1 Introduction PageCHAPTER CONNECTING TO THE NETWORK 2.2 POWER-UP LED SEQUENCE2.1 INTRODUCTION 2.3 TYPICAL CONFIGURATIONS 2.4 CONNECTING THE TOKEN RING MODULE TO A HUB2.4.1 Unshielded Twisted Pair 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 Source Routing and SRT 3.5.2.1 Bridging Method3.5.2.2 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 Token Ring Switch Module User Guide Chapter 3 ConﬁguringPage 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 4.2 MODULE STATISTICS Table 4-1 Destination Addresses and Forwarding OutcomesDestination Address Forwarding OutcomesifTxSizes - The number of packets not sent due to size limitations Token Ring Switch Module User Guide Chapter 4 StatisticsPage CHAPTER DIAGNOSTICS AND TROUBLESHOOTING 5.1 POWER-UP DIAGNOSTICS 5.1.1 Power-up Tests5.1.2 Power-up Results 5.2 OPERATIONAL DIAGNOSTICS 5.2.1 Loopback TestsChapter 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 6.1 UNPACKING THE TOKEN RING SWITCH MODULE 6.2 ADDING A TOKEN RING SWITCH MODULECHAPTER ADDING/SWAPPING MODULES Delete all static addresses 6.3 SWAPPING A MODULE Token Ring Switch Module User Guide Chapter 6 Adding/Swapping ModulesPage 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 ExampleFigure B-2 Data Path Using Source Routing Bridging Station AStation C B.4 SOURCE ROUTING TRANSPARENT BRIDGING Token Ring Switch Module User Guide Appendix B Bridging MethodsPage B-6 INDEX Token Ring Switch Module User Guide IndexIndex-2