EXP Computer PathBuilder S200 Manual de usuario

3Com® CorporationPathBuilder™ S200 Series SwitchBridging

6 BridgingBridging Features and CapabilitiesEthernet LAN What Is It? Ethernet is a common implementation of LAN topology wherein stations are connect

96 BridgingSpanning Tree Protocol Entity (STPE)Other ConsiderationsOne important consideration is based on the fact that any bridge downstream from t

Bridging 97T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Bridge Forward Delay TimerForward Delay For transparent bridges the bridge Forwa

98 BridgingSpanning Tree Protocol Entity (STPE)Suppose all bridges come up at the same time. Initially, at t=0, all bridges think they are the root a

Bridging 99T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Aging Timer The Aging Timer is a configurable parameter found in the Bridge Para

100 BridgingLLC2 Local TerminationLLC2 Local TerminationLLC2 Local TerminationLLC2 Local Termination lets specific Token Ring ports generate and resp

Bridging 101T0008-16F Release 5.2MLLC2 Local TerminationBefore Local Termination Without Local Termination, networks face significant problems with b

102 BridgingLLC2 Local TerminationSupported TopologiesLocal Termination is supported only on Token Ring topologies configured for Source Route Bridgi

Bridging 103T0008-16F Release 5.2MLLC2 Local TerminationProper LT configurationFigure 52 shows a Token Ring LAN properly configured for Local Termina

104 BridgingLLC2 Local TerminationSpoofing Local termination or “spoofing” of LLC protocol means that acknowledgments to information frames and certa

Bridging 105T0008-16F Release 5.2MLLC2 Local TerminationTraffic Priority & Local TerminationYou can significantly optimize your spoofing operatio

Bridging 7T0008-16F Release 5.2MBridging Features and CapabilitiesExample of Ethernet Bridge OperationFigure 5 shows an example of two Ethernet LANs

106 BridgingLLC2 Local TerminationConfiguring Local TerminationConfiguring for Local TerminationPerform the following procedures to configure Local T

Bridging 107T0008-16F Release 5.2MLLC2 Local TerminationConfiguring the LT Station TableThese parameters make up the LT Station Table.2 Configure all

108 BridgingLLC2 Local TerminationConfiguring the LT WAN ParametersThese parameters make up the LT WAN Parameters Table.Local SAPRange: 01 to FE (hex

Bridging 109T0008-16F Release 5.2MLLC2 Local TerminationBoot Type: LLC LT WAN Parameters.T2 Rx Ack Timer (continued)Ti Inactivity TimerRange: 2 to 2

110 BridgingLLC2 Local TerminationLLC LT Profile Table ConfigurationThese parameters make up the LLC LT Profile Table.Tx Window SizeRange: 1 to 15De

Bridging 111T0008-16F Release 5.2MLLC2 Local TerminationT1 Reply TimerRange: 1 to 25 (seconds)Default: 1Description: This Ack timer is used by a sta

112 BridgingLLC2 Local TerminationN3 ACK Delay CountRange: 1 to 15Default: 3Description: The Receive Count is used with T2 to reduce the number of ac

Bridging 113T0008-16F Release 5.2MLLC2 Local TerminationDeleting LT Configuration RecordsOverview You can delete the following LLC2 LT configuration

114 BridgingMixed LAN OperationMixed LAN OperationOverview PathBuilder S24x, 26x, and 27x switches support a mixture of Token Ring and Ethernet inter

Bridging 115T0008-16F Release 5.2MMixed LAN OperationSteps to Configure Mixed LAN Bridging OperationTo perform mixed LAN bridging operation in a Path

8 BridgingBridging Features and CapabilitiesMixed LAN BridgingWhat is It? PathBuilder S24x, 26x, and 27x switches support a mixture of Token Ring and

116 BridgingMixed LAN OperationNoteDuplicate bridge link or router interface numbers results in only the lowest numbered port being initialized.Stati

Bridging 117T0008-16F Release 5.2MDual LAN EthernetDual LAN EthernetWhat Is It? The Dual LAN Ethernet feature lets your PathBuilder S24x, 26x, and 27

118 BridgingDual LAN EthernetRouting In IP/IPX or AppleTalk routing environments, do not connect both Ethernet LAN ports to the same Ethernet segmen

Bridging 119T0008-16F Release 5.2MDual LAN EthernetFor Details on Parameters...See the PathBuilder S200 Series Basic Protocols for details on Etherne

120 BridgingLAN Server SubsystemLAN Server SubsystemWhat is It? The LAN Server Subsystem (LSS) software lets PathBuilder S200 series switches such as

Bridging 121T0008-16F Release 5.2MLAN Server SubsystemStatistics and AlarmsStatistics and status alarm thresholds maintained by the LSS are specific

122 BridgingLAN Server SubsystemConfiguring the LSS RecordExample of LCC RecordFigure 56 shows the LSS Record parameters used to configure a PathBuil

Bridging 123T0008-16F Release 5.2MLAN Server Subsystem*Virtual Bridge IDRange: 0 to 15Default: 0Description: Represents the bridge ID of a virtual so

124 BridgingBridge StatisticsBridge Statistics Introduction The Bridge Statistics section provides information about the LAN Port, Bridge Links, LAN

Bridging 125T0008-16F Release 5.2MBridge StatisticsSpanning Tree StatisticsSpanning Tree (STPE) StatusFigure 58 shows the information displayed by th

Bridging 9T0008-16F Release 5.2MBridging Features and CapabilitiesMAC AddressingWhat Is It? Bridges, whether they using Transparent Bridging, operate

126 BridgingBridge StatisticsState The STPE view of the link’s current state. The possible states are:• Disabled: The STPE is disabled. (If STPE Cont

Bridging 127T0008-16F Release 5.2MBridge StatisticsDetailed Bridge Link StatisticsIntroduction Figure 59 and Figure 60 show sample statistics screens

128 BridgingBridge StatisticsDescription of Screen TermsThis table describes Detailed Bridge Link Statistics terms.Term DescriptionBridge Link Status

Bridging 129T0008-16F Release 5.2MBridge StatisticsSR (Source Route): Frame SummaryReceived/Transmitted: The number of Source Route frames received/s

130 BridgingBridge StatisticsBridge Link Filter SummaryExample of Bridge Link Filter SummaryFigure 61 shows the information displayed by the Bridge L

Bridging 131T0008-16F Release 5.2MBridge StatisticsActive Filters:MAC Address• MAC Address: 6-byte value of MAC Address parameter from the MAC Filter

132 BridgingBridge StatisticsTransparent Bridge Forwarding Table StatisticsTB Forwarding Stats ExampleTB Forwarding Table statistics are shown in Fig

Bridging 133T0008-16F Release 5.2MBridge StatisticsForwarding Database• MAC Address: 6-byte value of MAC Address parameter from the MAC Filter Table.

134 BridgingBridge StatisticsTransparent Bridge Detailed Bridge Link StatisticsDetailed Bridge Link Statistics Figure 63 shows page 2 of the Detailed

Bridging 135T0008-16F Release 5.2MBridge StatisticsTB Frame SummaryFrames Received/Transmitted:• Unicast: This is a count of frames received/transmit

10 BridgingBridging Features and CapabilitiesLLC2 Local TerminationLLC2 Local TerminationPathBuilder S200 series switch support includes LLC2 Local T

136 BridgingBridge StatisticsLAN Connection StatisticsExample of LAN Connection Statistics MenuThe LAN Connection Statistics Menu screen is shown in

Bridging 137T0008-16F Release 5.2MBridge StatisticsFigure 66. Detailed LAN Connection Statistics - Second PageNode: Address: Date: Time:Detailed LAN

138 BridgingBridge StatisticsDescription of Screen TermsThis table describes screen terms for pages 1 and 2 of the Detailed LAN Connection Statistics

Bridging 139T0008-16F Release 5.2MBridge StatisticsPacket Summary • Data: Summary of each packet sent on the WAN and received from the WAN bridge lin

140 BridgingBridge StatisticsExample of LAN Connection Summary StatisticsFigure 67 shows the LAN Connection Summary Statistics.Figure 67. LAN Connect

Bridging 141T0008-16F Release 5.2MBridge StatisticsLLC2 LT Session Summary StatisticsSample of Session Summary StatisticsFigure 68 shows a sample of

142 BridgingBridge StatisticsStatus Indicates the session between the local and remote MAC addresses. • UP - MAC addresses are communicating using Lo

Bridging 143T0008-16F Release 5.2MBridge StatisticsLLC2 LT Detailed Session StatisticsSample of Detailed Session Statistics Figures 69 and 70 show sa

144 BridgingBridge StatisticsDescription of Screen AttributesThis table describes the screen attributes for the Detailed Session Statistics screens a

Bridging 145T0008-16F Release 5.2MBridge StatisticsLocal Station Session SummaryTX Window: Transmit window size obtained from the configuration for t

Bridging 11T0008-16F Release 5.2MBridging Features and CapabilitiesAutolearn for Local TerminationWhat Is It? Local Termination Autolearn reduces the

146 BridgingBridge StatisticsRemote Spoofer Session SummaryTX Window: Transmit window size obtained from the configuration for LLC WAN parameters.Pro

Bridging 147T0008-16F Release 5.2MBridge StatisticsReset StatisticsHow to... Reset Port Statistics: Consistent with PathBuilder S200 series switch, t

148 BridgingBridge Statistics

Technical Support A-1Appendix ATechnical Support3Com provides easy access to technical support information through a variety of services. This append

A-2 Technical Support3Com Bulletin Board Service The 3Com BBS contains patches, software, and drivers for 3Com products. This service is available th

Technical Support A-3If you are unable to contact your network supplier, see the following section on how to contact 3Com.Support from 3ComIf you are

A-4 Technical SupportReturning Products for RepairBefore you send a product directly to 3Com for repair, you must first obtain a Return Materials Aut

IndexIndex-1Numerics3Com bulletin board service (3Com BBS) A-23Com URL A-13ComFacts A-2AAll Route Broadcast frame 39All Route Explorer (ARE)TEST frame

Index-2Forwarding delay 87Frame handlingAll Route Broadcast 39duplicate frames 36single route broadcast 39Frame passingexample 61Framesbetween spoofer

Index-3enabling for TR operation 40Non-broadcast frames 39Nonefiltering action 59Novell IPX 74Oonline technical services A-1OUIin SNAP 74Outgoing Dest

12 BridgingBridging Features and CapabilitiesFilteringWhat Is It? Filtering lets you restrict data traffic from certain segments of your network. The

Index-4bulletin board service A-2fax service A-2network suppliers A-2product repair A-4TEST frame 42description 43RII bit 42Specific Route type 46Toke

Index-5

Bridging 13T0008-16F Release 5.2MBridging Features and CapabilitiesSpanning Tree Protocol What Is It? Spanning Tree Protocol reduces multiple bridge

14 BridgingBridging Features and CapabilitiesDual Ethernet LANsWhat Is It? The PathBuilder S24x, 26x, and 27x switch supports up to two Ethernet LANs

Bridging 15T0008-16F Release 5.2MBasic Remote Bridging ExamplesBasic Remote Bridging ExamplesIntroduction This section shows some common examples of

Notice©1998 3Com Corporation5400 Bayfront PlazaSanta Clara, CA 95052-8145(408) 326-5000All rights reserved.Printed in U.S.A.Portions reprinted with th

16 BridgingBasic Remote Bridging ExamplesA Less Complex Extended BridgeFigure 11 shows a possible arrangement of SVCs (PVCs for Frame Relay) that pro

Bridging 17T0008-16F Release 5.2MBridge Hardware Components in PathBuilder S200 Series SwitchesBridge Hardware Components in PathBuilder S200 Series

18 BridgingBridge Hardware Components in PathBuilder S200 Series Switches

Bridging 19T0008-16F Release 5.2MSetting Up WAN Operation for BridgingSetting Up WAN Operation for BridgingIntroduction With the 3Com Bridging Protoc

20 BridgingSetting Up WAN Operation for BridgingLAN Connection SubaddressThe LAN Connection Subaddresses identifies all LAN Connections. Incoming cal

Bridging 21T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationConfiguring the PathBuilder S200 Series Switch

22 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationBridge ParametersBridge Port Record ParametersAfter you configure the

Bridging 23T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationNoteIf STPE Control parameter is set to MAN, th

24 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationDescription: Represents the timeout value in minutes. The Bad Hello c

Bridging 25T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationNoteIf STPE Control parameter value is AUTO, th

Notice (continued)Proprietary MaterialInformation and software in this document are proprietary to 3Com (or its Suppliers) and without the express pri

26 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationBridge Link ParametersIntroduction The bridge uses Bridge Links as co

Bridging 27T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationParameters These parameters make up the Bridge

28 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationHop Count LimitRange: 0 to 7Default: 7Description: Specifies the maxi

Bridging 29T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationProtocol Filter ActionRange: NONE, PASS, BLOCKD

30 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationNoteThe following parameter appears if you set Link Mode to RFC1294Li

Bridging 31T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationLAN Connection TableIntroduction The LAN Connec

32 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging Operation*LAN Forwarder TypeRange: ROUT, BRID, BROUTDefault: ROUTDescription:

Bridging 33T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationEncapsulation TypeRange: RFC 877, RFC 1294 Def

34 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationBilling RecordsRange: OFF, ONDefault: OFFDescription: Enables or disa

Bridging 35T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationLimiting Bridge Frame SizesOverview Although th

36 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationIncreasing the frame size also causes the reduction in frame overhead

Bridging 37T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationConfiguring Translational BridgingIntroduction

38 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationFigure 18. Translational Bridging ExampleFigure 19 shows a situation

Bridging 39T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationBridge Frame HandlingIntroduction This section

40 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationConfiguring Source Route Bridging OperationIntroduction You configure

Bridging 41T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging Operation• LAN Side: The LAN port connection consists of

42 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging OperationConnecting a Station to a Server in Source Route BridgingIntroduction

Bridging 43T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationFigure 22. Server’s Destination MAC Address Not

44 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging Operation5) The PathBuilder S200 series switch transfers a copy of the ARE fra

Bridging 45T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationFigure 25. WAN Adapter Transmits Each ARE Frame

Bridging 1BridgingOverviewFunctionality PathBuilder S200 series switches support bridging of data traffic for Ethernet LANs. Bridging LAN traffic min

46 BridgingConfiguring the PathBuilder S200 Series Switch for Bridging Operation8) The server issues a Specific Route TEST frame (also called a non-b

Bridging 47T0008-16F Release 5.2MConfiguring the PathBuilder S200 Series Switch for Bridging OperationAttaching a Station to a RingThis table describ

48 BridgingTransparent Bridging for Ethernet LANsTransparent Bridging for Ethernet LANsIntroduction A transparent bridge, also known as a spanning tr

Bridging 49T0008-16F Release 5.2MTransparent Bridging for Ethernet LANsTransparent Bridge Forwarder ExampleFigure 27 shows how the Forwarder and the

50 BridgingTransparent Bridging for Ethernet LANsForwarder/ Hardware Accelerator and LAN/WAN HandlersFigure 28 shows the relationship of the Forwarde

Bridging 51T0008-16F Release 5.2MTransparent Bridging for Ethernet LANsForwarder FunctionsThe Forwarder bridging logic includes decisions such as:• W

52 BridgingTransparent Bridging for Ethernet LANsForwarder and STPEThe Forwarder cleans up all entries in the Forwarding Table when there are spannin

Bridging 53T0008-16F Release 5.2MTransparent Bridging for Ethernet LANsForwarder Database and Spanning TreeHow They Work TogetherThere is a close rel

54 BridgingTransparent Bridging for Ethernet LANsUsing FiltersSupport The Forwarder provides its own filtering facility which is used to reduce unnec

Bridging 55T0008-16F Release 5.2MTransparent Bridging for Ethernet LANsMulticast Link Protect FlagWhen a multicast/broadcast frame comes from a link

2 BridgingMixed LAN Support PathBuilder S200 series switches support mixed LAN bridging, meaning you can configure an Ethernet interface in the same

56 BridgingTransparent Bridging for Ethernet LANsTransparent Bridge Configuration ParametersTB Forwarding TableFigure 29 shows the Transparent Bridge

Bridging 57T0008-16F Release 5.2MBridge FilteringBridge FilteringWhat is It? Bridge filtering prevents extraneous traffic from traversing the WAN and

58 BridgingBridge FilteringMAC Address FilteringWhat Is It? This feature lets you filter bridge traffic based on MAC address. The Bridge Link Table a

Bridging 59T0008-16F Release 5.2MBridge FilteringMAC Address Filtering Action Parameter SelectionsThis table lists the filtering actions available fo

60 BridgingBridge FilteringMAC Filtering ProcessFigure 30 shows the MAC Filtering process. Figure 30. MAC Address Filtering ActionCheck BridgeLink Re

Bridging 61T0008-16F Release 5.2MBridge FilteringMac Filtering ProcessAs shown in Figure 30, if a match is detected, the system applies the filtering

62 BridgingBridge FilteringMAC Address Filtering ExamplesIntroduction This section shows two filtering examples. Figure 32 shows how the source addre

Bridging 63T0008-16F Release 5.2MBridge FilteringConfiguring the MAC Address Filter TableIn a Bridge Link Record, Pass (or Block) tells the system to

64 BridgingBridge FilteringIdentifying Address Links for MAC AddressingWhy it is Important Identifying the address links is an important step in conf

Bridging 65T0008-16F Release 5.2MBridge FilteringMAC Wildcard FilteringWhat Is It? MAC wildcard filtering is an enhancement to the Motorola Network A

Bridging 3T0008-16F Release 5.2MIn This Manual Topic See PageBridging Features and Capabilities ...

66 BridgingBridge FilteringConfiguring the MAC Address Filter TableIntroduction The MAC Address Filter Table controls which frames are allowed to pas

Bridging 67T0008-16F Release 5.2MBridge FilteringParameters These parameters make up the MAC Address Filter Table.Entry NumberRange: 1 to 300Default:

68 BridgingBridge FilteringOutgoing Source Address Link ActionRange: PASS, BLOCK, PASSLIST, BLOCKLISTDefault: PASSDescription: Outgoing source means

Bridging 69T0008-16F Release 5.2MBridge FilteringOutgoing Destination Address Link ActionRange: PASS, BLOCK, PASSLIST, BLOCKLISTDefault: PASSDescript

70 BridgingBridge FilteringProtocol FilteringWhat is It? Protocol filtering is used to prevent nodes operating with a certain protocol from operating

Bridging 71T0008-16F Release 5.2MBridge FilteringConfiguring the Protocol Filter TableIntroduction The Protocol Filter Table prevents stations operat

72 BridgingBridge FilteringProtocol TypeRange: DSAP, SNAPDefault: DSAPDescription: Indicates what type of protocol is involved in the frame.DSAP (Des

Bridging 73T0008-16F Release 5.2MBridge FilteringIncoming Protocol Link ActionRange: PASS, BLOCK, PASSLIST, BLOCKLISTDefault: PASSDescription: Specif

74 BridgingBridge FilteringDSAP Values The DSAP is a 1-byte ID found in the LLC field (see Figure 37). You set this value in the Protocol Value param

Bridging 75T0008-16F Release 5.2MBridge FilteringExample of Protocol Filter TableThis table provides an overview of the Protocol Filter Table paramet

4 BridgingIn This NoticeTopic See Page(continued)Bridge Statistics ...

76 BridgingBridge FilteringNetBIOS Name Filtering Introduction The NetBIOS Name Filtering feature compares NetBIOS broadcasts to a “pattern” that may

Bridging 77T0008-16F Release 5.2MBridge FilteringForcing a Local Domain With NetBIOS Name FiltersThe NetBIOS Name Filtering feature can also force a

78 BridgingBridge FilteringConfiguring NetBIOS Name FilteringIntroduction This section describes how to use the Control Terminal Port (CTP) to config

Bridging 79T0008-16F Release 5.2MBridge FilteringConfiguring NetBIOS Name FilteringTo access the NetBIOS Name Filter Action parameter, follow the ste

80 BridgingBridge FilteringConfigure NetBIOS Name Filter TableFigure 41 highlights the NetBIOS Name Filter Table selection in the Configure Bridge me

Bridging 81T0008-16F Release 5.2MBridge FilteringTypical Filtering For the typical case, where you filter client broadcast traffic by default and pas

82 BridgingBridge FilteringIncoming NetBIOS Name Link Action Range: PASS, BLOCK, PASSLIST, BLOCKLISTDefault: PASSDescription: The following describes

Bridging 83T0008-16F Release 5.2MBridge FilteringOutgoing NetBIOS Name Link ActionRange: PASS, BLOCK, PASSLIST, BLOCKLISTDefault: PASSDescription: T

84 BridgingBridge FilteringNetBIOS Name Filtering StatisticsIntroduction For each bridge link, you can display the number of packets discarded due to

Bridging 85T0008-16F Release 5.2MBridge FilteringNetBIOS Packet FormatsIntroduction NetBIOS Name Filtering operates only on the Microsoft or IBM-comp

Bridging 5T0008-16F Release 5.2MBridging Features and CapabilitiesBridging Features and CapabilitiesIntroduction This section describes bridging feat

86 BridgingSpanning Tree Protocol Entity (STPE)Spanning Tree Protocol Entity (STPE)Introduction The Spanning Tree Protocol Entity (STPE) is part of t

Bridging 87T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Bridge Links There are three types of bridge links within a given spanning tree

88 BridgingSpanning Tree Protocol Entity (STPE)Tips on Spanning TreeDetermining a spanning tree in order to set up a manual tree may seem more labor

Bridging 89T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)STPE Parameter Setting ConsiderationsIntroduction This section discusses how the

90 BridgingSpanning Tree Protocol Entity (STPE)Setting the Root Bridge of the Spanning TreeThe bridge with the lowest Bridge ID becomes the root brid

Bridging 91T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Determining Path CostsBridges use Path Cost to determine their Root Link. The ra

92 BridgingSpanning Tree Protocol Entity (STPE)Consider the Nature and Expected Number of SVCsA further consideration for setting path cost is the na

Bridging 93T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Other Considerations for Selecting LinksThere are two final considerations when

94 BridgingSpanning Tree Protocol Entity (STPE)The same priority mechanisms that determine the root link are also applied in determining which links

Bridging 95T0008-16F Release 5.2MSpanning Tree Protocol Entity (STPE)Spanning Tree TimersIntroduction If the spanning tree converges to a final topol