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Cabletron Systems 3T02-04 manual Appendix B Bridging Methods, B.1 OVERVIEW

Models: 3T02-04

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APPENDIX B

BRIDGING METHODS

B.1 OVERVIEW

Each port of the ATX can be conﬁgured for transparent (802.1d) bridging, IBM source routing bridging, or source routing transparent bridging (802.5M). Depending on network topology, it may be desirable to include a mix of these methods within a single ATX.

The choice of bridging methods is determined both by end station requirements and by other internetworking equipment.

Source routing end stations may use any of the three bridging methods. Transparent end stations must use either transparent or SRT bridging. When in doubt, transparent bridging is the easiest to conﬁgure and use.

If redundant links are employed along with IBM source routing bridges, then the attached ATX port should be conﬁgured for source routing. This will enable the mesh of bridges to derive a spanning tree suitable for spanning tree explorer frames and for multicast packets.

If source routing is desired, and either Ethernet or FDDI is to be used as a backbone between Token Rings, then the Ethernet or FDDI port should be conﬁgured for SRT bridging. (SRT over Ethernet is not a standard, but is available for use between multiple ATX chassis in backbone applications. In this case, the “Ethernet” may actually be a microwave or satellite link with an Ethernet-like interface.)

A common mixture of bridging modes may occur when Ethernet segments and Token- Ring segments do not exchange data but share an FDDI backbone. In this case, the Ethernets may be conﬁgured for transparent bridging, the Token Rings for source routing, and the FDDI backbone for SRT. (Don't infer from this example that SRT is the sum of transparent and source routing bridging; it is a distinct third method).

The bridging method is dependent on the conﬁguration of the bridge entry and exit ports, and the value of the Routing Indicator (RII) bit in the received frame. The following chart summarizes the interaction between the bridging method.

Token Ring Switch Module User Guide

Page B-1

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Cabletron Systems 3T02-04 manual Appendix B Bridging Methods, B.1 OVERVIEW

Contents

TOKEN RING SWITCH MODULE 3T02-04 AND 3T01-04 USER GUIDE Page Token Ring Switch Module User Guide FCC NOTICE Token Ring Switch Module User GuideDOC NOTICE VCCI NOTICEToken Ring Switch Module User Guide EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITYCABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT CABLETRON SOFTWARE PROGRAM LICENSEUNITED STATES GOVERNMENT RESTRICTED RIGHTS Token Ring Switch Module User GuideCHAPTER 2 CONNECTING TO THE NETWORK CONTENTSCONFIGURING Token Ring Switch Module User GuideCHAPTER 5 DIAGNOSTICS AND TROUBLESHOOTING ContentsTECHNICAL SPECIFICATIONS Token Ring Switch Module User GuideCHAPTER INTRODUCTION 1.1 DOCUMENT CONVENTIONS 1.3 GETTING HELP 1.2 RELATED MANUALSanonymous your email address1.4 GENERAL DESCRIPTION 1.5 STANDARDS 1.6 CONNECTORSFigure 1-1 ATX Front Panel Figure 1-2 3T02-04 and 3T01-04 Front PanelsToken Ring Switch Module User Guide 1.7 LEDsChapter 1 Introduction PageCHAPTER CONNECTING TO THE NETWORK 2.2 POWER-UP LED SEQUENCE2.1 INTRODUCTION 2.4 CONNECTING THE TOKEN RING MODULE TO A HUB 2.3 TYPICAL CONFIGURATIONS2.4.1 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 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 Source Routing and SRT 3.5.2.1 Bridging Method3.5.2.2 Segment Number 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 Token Ring Switch Module User Guide Chapter 3 ConﬁguringPage 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 Table 4-1 Destination Addresses and Forwarding Outcomes 4.2 MODULE STATISTICSDestination Address Forwarding OutcomesifTxSizes - The number of packets not sent due to size limitations Token Ring Switch Module User Guide Chapter 4 StatisticsPage 5.1 POWER-UP DIAGNOSTICS 5.1.1 Power-up Tests CHAPTER DIAGNOSTICS AND TROUBLESHOOTING5.1.2 Power-up Results 5.2 OPERATIONAL DIAGNOSTICS 5.2.1 Loopback TestsChapter 5 Diagnostics and Troubleshooting 5.3 TROUBLESHOOTING 5.3.1 If the Module Fails to Power Up 5.2.2 Diagnostic Results5.3.2 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 B.1 OVERVIEW APPENDIX B BRIDGING METHODSAppendix B Bridging Methods B.2 TRANSPARENT BRIDGINGFigure B-1 Source Routing Example B.3 SOURCE ROUTING BRIDGINGFigure 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