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Published byShauna Ray Modified over 8 years ago
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Chapter 19 Configuring Source-Route Bridging
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Objectives Upon completion of this chapter, you will be able to perform the following tasks: Describe the basic functions of source-route bridging (SRB) Configure source-route bridging Configure source-route transparent bridging Configure source-route translational bridging Verify source-route bridging operation
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Source-Route Bridging
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Source-Route Bridging Overview Explorer packets discover route destination X Y Token Ring 501 Token Ring 502 Token Ring 505 Token Ring 500 Bridge 2 Bridge 4Bridge 1 Bridge 3
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Source-Route Bridging Operation Source chooses path to destination X Y Token Ring 501 Token Ring 502 Token Ring 505 Token Ring 500 Bridge 2 Bridge 4Bridge 1 Bridge 3 500 1 501 2 502 RIF X Y 500 3 505 4 502 RIF X Y
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Routing Information Indicator Indicates routing information is contained in the frame Most significant bit of the source address Set by the source Destination SourceRIFData FCS Address RII
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Routing information Field RCRD …. RIF Routing Control Type 0 X X 1 0 X 1 1 X Specific route All rings, all routes Spanning route Length Direction Largest Route Description Ring Number Bridge Number Contains control and path information
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SRB Configuration Router (config-if) # source-bridge local-ring bridge-number target-ring Specifies the local bridge connection Router (config-if) # Source-bridge spanning Actives automatic spanning for an interface
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SRB Configuration (cont.) Token Ring 500 Token Ring 501 Bridge 1 To0To1 Two Local Rings interface tokenring 0 source-bridge 500 1 501 source-bridge spanning interface tokenring 1 source-bridge 501 1 500 source-bridge spanning interface tokenring 0 source-bridge 500 1 501 source-bridge spanning interface tokenring 1 source-bridge 501 1 500 source-bridge spanning
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SRB Automatic Spanning Tree Configuration Token Ring Token Ring Token Ring 500 Token Ring 501 Token Ring Y X bridge 7 protocol ibm ! interface tokenring 0 source-bridge 500 1 501 source bridge spanning 7 ! Interface tokenring 1 source-bridge 501 1 500 source-bridge spanning 7 bridge 7 protocol ibm ! interface tokenring 0 source-bridge 500 1 501 source bridge spanning 7 ! Interface tokenring 1 source-bridge 501 1 500 source-bridge spanning 7
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Multiport Configuration Token Ring 500 Bridge 1 Token Ring 501 Virtual Ring 10 Token Ring 502 Router (config) # source-bridge ring-group ring-group-number Creates a virtual ring
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Multiport Configuration Example Token Ring 500 Token Ring 501 Bridge # 1 To0To1 source-bridge ring-group 10 interface tokenring 0 source-bridge 500 1 10 source-bridge spanning interface tokenring 1 source-bridge 502 1 10 source-bridge spanning source-bridge ring-group 10 interface tokenring 0 source-bridge 500 1 10 source-bridge spanning interface tokenring 1 source-bridge 502 1 10 source-bridge spanning Token Ring 502 To2
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Proxy Explorer Token Ring Token Ring Token Ring Token Ring B A Z Router (config-if) # source-bridge proxy-explorer Enables the interface to send specifically frames to the destination
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multiring Command SRB Token Ring 32 Token Ring 31 Source-Route Bridge Network Routed Network Routed Network Router (config-if) # multiring { keyword [ all-routes | spanning ] | all | other } Enables the collection and use of RIF information
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Multiring Configuration Example SRB Token Ring 32 Token Ring 31 Source-Route Bridge Network Routed Network Routed Network interface tokenring 0 multiring ip ip address 172.16.183.37 255.255.255.0 ipx network 33
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Source-Route Transparent Bridging
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Source-Route Transparent Bridging SRB Token Ring TB D Token Ring C Transparent bridging and source-route bridging traffic handled appropriately
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SRT Operation Token Ring Token Ring RIF Has RIF ? Transparent Bridging ModuleSource-Route Bridging Module YES NO
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SRT Configuration Example 500 SRT 501 C B A D Transparent Source Route bridge 4 protocol ieee source-bridge ring-group 10 ! interface ethernet 0 bridge-group 4 interface ethernet 1 bridge-group 4 interface tokenring 0 bridge-group 4 source-bridge 500 1 10 source-bridge spanning interface tokenring 1 bridge-group 4 source-bridge 501 1 10 source-bridge spanning
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Source-Route Translational Bridging
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Bridging Different Media with SR/TLB SRT Token Ring TB SRB Domain TB Domain Source-route translational bridging (SR/TLB) translates between transparent and SRB bridging SR/TLB handles: - MTU - RIF - Bit ordering - MAC address in data
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B Source-Route Translational Bridging Token Ring C Pseudo Ring “Virtual” Bridge Group TB sees SRT as “Virtual” bridge group SRT sees TB pseudo ring RIF information added or removed
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SR/TLB configuration Router (config-if) # Source-bridge transparent ring-group pseudo-ring bridge-number tb-group [ oui ] Enables bridging between the transparent bridge configuration and the source-route bridge configuration
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SR/TLB Configuration Example 500 P.R. 13 Bridge 4 protocol ieee source-bridge ring-group 10 source-bridge transparent 10 13 14 ! Interface ethernet 0 bridge-group 4 interface ethernet 1 bridge-group 4 interface tokenring 0 source-bridge 500 1 10 source-bridge spanninng interface tokenring 1 source-bridge 501 1 10 source-bridge spanning Bridge 4 protocol ieee source-bridge ring-group 10 source-bridge transparent 10 13 14 ! Interface ethernet 0 bridge-group 4 interface ethernet 1 bridge-group 4 interface tokenring 0 source-bridge 500 1 10 source-bridge spanninng interface tokenring 1 source-bridge 501 1 10 source-bridge spanning
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Verifying Source- Route Bridging Operation
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Verifying SRB Operation Router# show source-bridge Local Interfaces: max receive transmit srn bn trn rpsnhpcnt:bytes cnt:bytes drops TR0 5 1 10 * * 7 39:1002 23:62923 Ring Group 10: This peer: TCP 172.16.92.92 Maximum output TCP queue length, per peer: 100 Peers:State lvpkts_rxpkts_txexpl_gndrops TCP TCP 172.16.92.92-200000 TCP 172.16.92.93open2*1818300 Rings: nb: 1 rn:5 local ma:4000.3080.844b TokenRing0fwd:18 nb: 1 rn:2 remote ma:4000.3080.8473 TCP 172.16.93.93fwd:36 Explorers:------------input------------------------------output--------------- spanning all-ringstotalspanning all-ringstotal TR0033358 Router# Router# show source-bridge Local Interfaces: max receive transmit srn bn trn rpsnhpcnt:bytes cnt:bytes drops TR0 5 1 10 * * 7 39:1002 23:62923 Ring Group 10: This peer: TCP 172.16.92.92 Maximum output TCP queue length, per peer: 100 Peers:State lvpkts_rxpkts_txexpl_gndrops TCP TCP 172.16.92.92-200000 TCP 172.16.92.93open2*1818300 Rings: nb: 1 rn:5 local ma:4000.3080.844b TokenRing0fwd:18 nb: 1 rn:2 remote ma:4000.3080.8473 TCP 172.16.93.93fwd:36 Explorers:------------input------------------------------output--------------- spanning all-ringstotalspanning all-ringstotal TR0033358 Router#
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Verifying SRB Operation (cont.) Router# show source-bridge Codes: * interface, - static, + remote Hardware Addr How Idle(min)Routing information Field 5c02.0001.4322rg5-0630.0053.00b0 5a00.0000.2333tr0308b0.0101.2201.0ff0 5b01.0000.4444 --- 0000.1403.4800tr10- 0000.2805.4c00tr0*- 0000.2807.4c00tr1*- 0000.28a8.4800tr00- 0077.2201.0001rg5100830.0052.2201.0ff0 Router# Router# show source-bridge Codes: * interface, - static, + remote Hardware Addr How Idle(min)Routing information Field 5c02.0001.4322rg5-0630.0053.00b0 5a00.0000.2333tr0308b0.0101.2201.0ff0 5b01.0000.4444 --- 0000.1403.4800tr10- 0000.2805.4c00tr0*- 0000.2807.4c00tr1*- 0000.28a8.4800tr00- 0077.2201.0001rg5100830.0052.2201.0ff0 Router#
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Summary Transparent bridging is predominantly used in Ethernet environments Spanning-tree algorithm eliminates loops IRB is used in the following situations: To migrate a bridged network to a routed network To connect a remote site that does not have routing capabilities To conserve IP, IPX, and Apple Talk addresses To increase performances by keeping local bridged traffic local
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