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Cisco Systems BC-109 manual Configure Source-Route Bridging, Configure a Dual-Port Bridge

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Configure Source-Route Bridging

Configure Source-Route Bridging

Configure Source-Route Bridging

Our implementation of source-route bridging enables you to connect two or more Token Ring networks using either Token Ring or Fiber Distributed Data Interface (FDDI) media.

The Cisco IOS software offers the ability to encapsulate source-route bridging traffic using RFC 1490 Bridged 802.5 encapsulation. This encapsulation provides SRB over Frame Relay functionality.

You can configure the Cisco IOS software for source-route bridging by performing the tasks in one of the first three sections and, optionally, the tasks in the last section:

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Configure a Dual-Port Bridge

Configure a Multiport Bridge Using a Virtual Ring

Configure SRB over FDDI

Configure Fast-Switching SRB over FDDI

Configure SRB over Frame Relay

Enable the Forwarding and Blocking of Spanning-Tree Explorers

Enable the Automatic Spanning-Tree Function

Limit the Maximum SRB Hops

Configure a Dual-Port Bridge

Adual-port bridge is the simplest source-route bridging configuration. When configured as a dual-port bridge, the access server or router serves to connect two Token Ring LANs. One LAN is connected through one port (Token Ring interface), and the other LAN is connected through the other port (also a Token Ring interface). Figure 45 shows a dual-port bridge.

Figure 45 Dual-Port Bridge

Token	T0		Token
Ring		T1	Ring
129		T1	130
129			130

S1102a

To configure a dual-port bridge that connects two Token Rings, you must enable source-route bridging on each of the Token Ring interfaces that connect to the two Token Rings. To enable source-route bridging, use the following command in interface configuration mode for each of the Token Ring interfaces:

Command	Purpose
source-bridgelocal-ring bridge-number target-ring	Enable local source-route bridging on
	a Token Ring interface.

Note Ring numbers need to be unique across interfaces and networks, so that when you enable source-route bridging over an interface the local and target rings are defined. Each node on the network will know if it is the target of explorer packets sent on the network.

BC-110Bridging and IBM Networking Configuration Guide

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Cisco Systems BC-109 manual Configure Source-Route Bridging, Configure a Dual-Port Bridge

Contents

SRB Configuration Task List Configuring Source-Route BridgingConfigure Source-Route Bridging Configure a Dual-Port BridgeFigure 46 Multiple Dual-Port Bridges Configure a Multiport Bridge Using a Virtual RingConfigure a Multiport Bridge Using a Virtual Ring Define a Ring Group in SRB Context Configure SRB over FDDI Enable SRB and Assign a Ring Group to an InterfaceEnable the Forwarding and Blocking of Spanning-Tree Explorers Configure Fast-Switching SRB over FDDIConfigure SRB over Frame Relay BC-114 Bridging and IBM Networking Configuration Guideno source-bridge spanning Enable the Automatic Spanning-Tree Functionsource-bridge spanning source-bridge spanning bridge-group Limit the Maximum SRB Hopsbridge bridge-group protocol ibm source-bridge spanning bridge-group path-cost path-costConfigure Bridging of Routed Protocols Enable Use of the RIFConfigure a Static RIF Entry Configure the RIF Timeout IntervalOverview of SR/TLB The following notes and caveats apply to all uses of SR/TLB Enable Translation Compatibility with IBM 8209 Bridges Enable Bridging between Transparent Bridging and SRBDisable Fast-Switched SR/TLB Enable Standard Token Ring LLC2-to-Ethernet LLC2 Conversion Enable Token Ring LLC2-to-Ethernet ConversionEnable 0x80d5 Processing Configure NetBIOS Support Enable the Proxy Explorers Feature on the Appropriate Interface Specify Timeout and Enable NetBIOS Name CachingCreate Static Entries in the NetBIOS Name Cache Configure the NetBIOS Cache Name LengthEnable NetBIOS Proxying Specify Dead-Time Intervals for NetBIOS PacketsConfigure LNM Support Configure LNM SupportConfiguring Source-Route Bridging BC-127 How a Router Works with LNM BC-128 Bridging and IBM Networking Configuration GuideDisable LNM Functionality Prevent LNM Stations from Modifying Cisco IOS Software Parameters Disable Automatic Report Path Trace FunctionEnable Other LRMs to Change Router Parameters lnm pathtrace-disabled all originChange Reporting Thresholds Apply a Password to an LNM Reporting LinkEnable LNM Servers lnm password number stringMonitor LNM Operation Enable the RPS Express Buffer FunctionChange an LNM Reporting Interval Secure the SRB Network Configure NetBIOS Access FiltersConfigure NetBIOS Access Filters Using Station Names netbios access-list bytes name permit deny offset Configure NetBIOS Access Filters Using a Byte Offsetnetbios access-list host name permit deny pattern netbios input-access-filter bytes nameConfigure Administrative Filters for Token Ring Traffic Filter Frames by Protocol TypeFilter Destination Addresses Filter Frames by Vendor CodeFilter Source Addresses source-bridge input-lsap-list access-list-numberConfigure Access Expressions that Combine Administrative Filters Configure Access Expressions Optimize Access ExpressionsAlter Access Lists Used in Access Expressions Tune the SRB NetworkEnable fast-switching Enable or Disable the Source-Route Fast-Switching CacheEnable or Disable the Source-Route Autonomous-Switching Cache Disable fast-switchingOptimize Explorer Processing Enable or Disable the SSEEstablish the Connection Timeout Interval Enable the SSE functionsource-bridge explorerq-depth depth Configure Proxy Explorers Establish SRB Interoperability with TI MAC FirmwareReport Spurious Frame-Copied Errors Monitor and Maintain the SRB NetworkSRB Configuration Examples Basic SRB with Spanning-Tree Explorers Example SRB-Only Example SRB with Automatic Spanning-Tree Function Configuration ExampleOptimized Explorer Processing Configuration Example SRB with Automatic Spanning-Tree Function Configuration ExampleS1103a SRB and Routing Certain Protocols ExampleMultiport SRB Example Configuring Source-Route Bridging BC-149 Configuration for Router ASRB with Multiple Virtual Ring Groups Example SRB with Multiple Virtual Ring Groups ExampleConfiguration for Router B SRB over FDDI Configuration ExamplesSRB over FDDI Fast-Switching Example Router ASRB over Frame Relay Configuration Example Configuration on Router C Configuration of Router AConfiguration on Router B Adding a Static RIF Cache Entry ExampleBridge Adding a Static RIF Cache Entry for a Two-Hop Path ExampleSR/TLB for a Simple Network Example Now you are ready to determine two things SR/TLB with Access Filtering Example NetBIOS Support with a Static NetBIOS Cache Entry Example BC-156 Bridging and IBM Networking Configuration GuideLNM for a Simple Network Example BC-158 Bridging and IBM Networking Configuration Guide LNM for a More Complex Network ExampleSRB Configuration Examples Physical configurationNetBIOS Access Filters Example Filtering Bridged Token Ring Packets to IBM Machines Example BC-160 Bridging and IBM Networking Configuration GuideAdministrative Access Filters-Filtering SNAP Frames on Output Example Administrative Access Filters-Filtering SNAP Frames on Output ExampleFigure 68 shows a router connecting four Token Rings Configuring Source-Route Bridging BC-161Creating Access Filters Example Access Filters Example Access Filters ExampleFast-Switching Example Figure 69 Network Configuration Using NetBIOS Access FiltersBC-164 Bridging and IBM Networking Configuration Guide Autonomous Switching ExampleSRB Configuration Examples