Source-Route Transparent and Source-Route Translational Bridging

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Slide 1: Chapter 11 Source-Route Transparent and Source-Route Translational Bridging 11-1 Copyright © 1998, Cisco Systems, Inc. Slide 2: Objectives Upon completion of this chapter, you will be able to perform the following: • Explain considerations for mixed-topology bridging. • Define source-route transparent bridging. • Configure source-route transparent bridging. • Define source-route translational bridging. • Configure source-route translational bridging. 11-2—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 3: Mixed-Topology Bridging A Token Ring B Problem: Broadcast CMSA/CD • Ethernet bridges are transparent. • MAC address is bit reversed. • Token Ring 02-06-80-01-02-03. • Packet size maximum 1516 bytes. Token passing • Token Ring bridges use RIF. • MAC address is bit reversed. • Ethernet 40-60-01-80-40-C0. • Packet size maximum 4472 bytes. Note: Packet size on Cisco switches is 18,190 bytes. 11-3—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 4: What Bridging is Required? 1) 2) Token Ring B1 Token Ring RIF 3) No RIF Token Ring Token Ring RIF B1 No RIF 11-4—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 5: Source-Route Transparent Bridging SRB TB Token Ring D Token Ring Not sure whether to use TB or SRB? DO BOTH ! Configure TB and SRB on workstation C. C 11-5—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 6: How Source-Route Transparent Bridging Works RIF Token Ring Token Ring YES Has RIF ? NO Source route transparent bridging module Transparent bridging module • Router examines Token Ring frame for RIF: – If RIF is present, the frame is source-route bridged. – If RIF is NOT present, the frame is transparently bridged. 11-6—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 7: SRT Configuration Tasks A B SRT Transparent Configuration • Define transparent bridge group. • Select spanning protocol. • Assign interface to bridge group. IEEE A B Application without RIFs Source-Route Configuration • Activate ring-bridge-ring connection. • Define SRB spanning bridge group. • Select interface spanning option. A 1 501 B Application with RIFs 11-7—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 8: SRT Configuration Router (config) # bridge group-number protocol protocol-type • Selects the spanning-tree protocol Router (config-if) # bridge-group group-number • Assigns an interface to a bridge group 11-8—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 9: SRT Configuration (cont.) Router (config) # source-bridge ring-group ring-group • Defines or removes a ring group Router (config-if) # source-bridge local-ring bridge-number target-ring • Specifies a local bridge connection 11-9—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 10: SRT Configuration (cont.) Router (config) # bridge bridge-group protocol ibm • Enables the automatic spanning-tree protocol Router (config-if) # source-bridge spanning bridge-group • Activates automatic spanning for an interface 11-10—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 11: SRT Bridging Configuration Example bridge 4 protocol ieee source-bridge ring-group 10 bridge 7 protocol ibm 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 7 interface tokenring 1 bridge-group 4 source-bridge 501 1 10 source-bridge spanning 7 A Transparent B SRT 501 500 D C Source Route 11-11—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 12: Is SRT the Best Solution? A B TB SRB 500 D 501 • RIF versus no RIF • Incompatible bit-ordering • Incompatible MTU size C 11-12—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 13: Source-Route Translational Bridging B SR/TLB Token Ring D Data packets are translated between transparently bridged and source-route bridged networks. 11-13—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 14: How Source-Route Translational Bridging Works B SR/TLB Token Ring D RIF stripped RIF added AA 1010 1010 55 0101 0101 • Handles MTU • Handles bit-ordering 11-14—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 15: SR/TLB Configuration Tasks Pseudo Ring 13 Bridge Group 4 B A Configure SRB and transparent bridging for your environment. 500 D SR/TLB Virtual Ring 10 Bridge 1 501 Global configuration • Set up translational bridge: – Define pseudo ring. – Define bridge number. C 11-15—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 16: SR/TLB Configuration Router (config) # 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. 11-16—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc. Slide 17: SR/TLB Configuration Example Pseudo bridge 4 protocol ieee source-bridge ring-group 10 bridge 7 protocol ibm source-bridge transparent 10 13 1 4 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 7 interface tokenring 1 bridge-group 4 source-bridge 501 1 10 source-bridge spanning 7 Ring 13 Bridge Group 4 B A SR/TLB Virtual Ring Bridge 1 10 501 C 500 D Bridge Group 7 Transparent Source Route SR/TLB Copyright © 1998, Cisco Systems, Inc. 11-17—SNAM—Source-Route Transparent and Source-Route Translational Bridging Slide 18: Summary In this chapter, you have learned: • What source-route transparent bridging is • What source-route translational bridging is • When source-route transparent bridging should be used • When source-route translational bridging should be used • How to configure source-route transparent and source-route translational bridging 11-18—SNAM—Source-Route Transparent and Source-Route Translational Bridging Copyright © 1998, Cisco Systems, Inc.