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Cisco Systems BC-109 manual Configuring Source-Route Bridging BC-127

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Configuring Source-Route Bridging BC-127

Configure LNM Support

Figure 51 LNM Linking to a Source-Route Bridge on Each Local Ring

Token

Ring

PC running

LNM

SRB B

	Token	SRB A	Token	SRB C	WAN	SRB D
	Ring		Ring

Token

Ring

Token

Ring

S1113a

If LNM requires information about a station somewhere on a Token Ring, it uses a proprietary IBM protocol to query to one of the source-route bridges connected to that ring. If the bridge can provide the requested information, it simply responds directly to LNM. If the bridge does not have the necessary information, it queries the station using a protocol published in the IEEE 802.5 specification. In either case, the bridge uses the proprietary protocol to send a valid response back to LNM, using the proprietary protocol.

As an analogy, consider a language translator who sits between a French-speaking diplomat and a German-speaking diplomat. If the French diplomat asks the translator a question in French for the German diplomat and the translator knows the answer, he or she simply responds without translating the original question into German. If the French diplomat asks a question the translator does not know how to answer, the translator must first translate the question to German, wait for the German diplomat to answer, and then translate the answer back to French.

Similarly, if LNM queries a source-route bridge in the proprietary protocol and the bridge knows the answer, it responds directly using the same protocol. If the bridge does not know the answer, it must first translate the question to the IEEE 802.5 protocol, query the station on the ring, and then translate the response back to the proprietary protocol to send to LNM.

Figure 52 illustrates requests from the LNM originating in an IBM proprietary protocol and then translated into IEEE 802.5 MAC-level frames.

Configuring Source-Route Bridging BC-127

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Cisco Systems BC-109 manual Configuring Source-Route Bridging BC-127

Contents

Configuring Source-Route Bridging SRB Configuration Task ListConfigure a Dual-Port Bridge Configure Source-Route BridgingConfigure a Multiport Bridge Using a Virtual Ring Configure a Multiport Bridge Using a Virtual RingFigure 46 Multiple Dual-Port Bridges Define a Ring Group in SRB Context Enable SRB and Assign a Ring Group to an Interface Configure SRB over FDDIBC-114 Bridging and IBM Networking Configuration Guide Configure Fast-Switching SRB over FDDIConfigure SRB over Frame Relay Enable the Forwarding and Blocking of Spanning-Tree Explorerssource-bridge spanning Enable the Automatic Spanning-Tree Functionno source-bridge spanning source-bridge spanning bridge-group path-cost path-cost Limit the Maximum SRB Hopsbridge bridge-group protocol ibm source-bridge spanning bridge-groupEnable Use of the RIF Configure Bridging of Routed ProtocolsConfigure the RIF Timeout Interval Configure a Static RIF EntryOverview of SR/TLB The following notes and caveats apply to all uses of SR/TLB Disable Fast-Switched SR/TLB Enable Bridging between Transparent Bridging and SRBEnable Translation Compatibility with IBM 8209 Bridges Enable 0x80d5 Processing Enable Token Ring LLC2-to-Ethernet ConversionEnable Standard Token Ring LLC2-to-Ethernet LLC2 Conversion Configure NetBIOS Support Specify Timeout and Enable NetBIOS Name Caching Enable the Proxy Explorers Feature on the Appropriate InterfaceSpecify Dead-Time Intervals for NetBIOS Packets Configure the NetBIOS Cache Name LengthEnable NetBIOS Proxying Create Static Entries in the NetBIOS Name CacheConfigure LNM Support Configure LNM SupportConfiguring Source-Route Bridging BC-127 BC-128 Bridging and IBM Networking Configuration Guide How a Router Works with LNMDisable LNM Functionality lnm pathtrace-disabled all origin Disable Automatic Report Path Trace FunctionEnable Other LRMs to Change Router Parameters Prevent LNM Stations from Modifying Cisco IOS Software Parameterslnm password number string Apply a Password to an LNM Reporting LinkEnable LNM Servers Change Reporting ThresholdsChange an LNM Reporting Interval Enable the RPS Express Buffer FunctionMonitor LNM Operation Configure NetBIOS Access Filters Using Station Names Configure NetBIOS Access FiltersSecure the SRB Network netbios input-access-filter bytes name Configure NetBIOS Access Filters Using a Byte Offsetnetbios access-list host name permit deny pattern netbios access-list bytes name permit deny offsetFilter Frames by Protocol Type Configure Administrative Filters for Token Ring Trafficsource-bridge input-lsap-list access-list-number Filter Frames by Vendor CodeFilter Source Addresses Filter Destination AddressesConfigure Access Expressions that Combine Administrative Filters Optimize Access Expressions Configure Access ExpressionsTune the SRB Network Alter Access Lists Used in Access ExpressionsDisable fast-switching Enable or Disable the Source-Route Fast-Switching CacheEnable or Disable the Source-Route Autonomous-Switching Cache Enable fast-switchingEnable the SSE function Enable or Disable the SSEEstablish the Connection Timeout Interval Optimize Explorer Processingsource-bridge explorerq-depth depth Establish SRB Interoperability with TI MAC Firmware Configure Proxy ExplorersMonitor and Maintain the SRB Network Report Spurious Frame-Copied ErrorsSRB Configuration Examples Basic SRB with Spanning-Tree Explorers Example SRB with Automatic Spanning-Tree Function Configuration Example SRB with Automatic Spanning-Tree Function Configuration ExampleOptimized Explorer Processing Configuration Example SRB-Only ExampleMultiport SRB Example SRB and Routing Certain Protocols ExampleS1103a SRB with Multiple Virtual Ring Groups Example Configuration for Router ASRB with Multiple Virtual Ring Groups Example Configuring Source-Route Bridging BC-149Router A SRB over FDDI Configuration ExamplesSRB over FDDI Fast-Switching Example Configuration for Router BSRB over Frame Relay Configuration Example Adding a Static RIF Cache Entry Example Configuration of Router AConfiguration on Router B Configuration on Router CSR/TLB for a Simple Network Example Adding a Static RIF Cache Entry for a Two-Hop Path ExampleBridge Now you are ready to determine two things SR/TLB with Access Filtering Example BC-156 Bridging and IBM Networking Configuration Guide NetBIOS Support with a Static NetBIOS Cache Entry ExampleLNM for a Simple Network Example Physical configuration LNM for a More Complex Network ExampleSRB Configuration Examples BC-158 Bridging and IBM Networking Configuration GuideNetBIOS Access Filters Example BC-160 Bridging and IBM Networking Configuration Guide Filtering Bridged Token Ring Packets to IBM Machines ExampleConfiguring Source-Route Bridging BC-161 Administrative Access Filters-Filtering SNAP Frames on Output ExampleFigure 68 shows a router connecting four Token Rings Administrative Access Filters-Filtering SNAP Frames on Output ExampleCreating Access Filters Example Figure 69 Network Configuration Using NetBIOS Access Filters Access Filters ExampleFast-Switching Example Access Filters ExampleSRB Configuration Examples Autonomous Switching ExampleBC-164 Bridging and IBM Networking Configuration Guide