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Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Examples

BC-81

Cisco IOS Bridging and IBM Networking Configuration Guide

Configuration for Router B

Router B demonstrates a simple bridge configuration. It is connected to the FDDI backbone and has

domain 2 defined. As such it can bridge traffic with the other FDDI-connected BSNs. Note that bridge

group 1 has no relationship to bridge group 1 in Router A; bridge groups are an organization internal to

each router.

interface ethernet 1

bridge-group 1

interface ethernet 2

bridge-group 1

interface fddi 0

bridge-group 1

bridge 1 domain 2

bridge 1 protocol ieee

Configuration for Router C

Router C and Router D combine to demonstrate load balancing by means of circuit groups. Circuit

groups are used to load balance across multiple parallel serial lines between a pair of routers. The router

on each end of the serial lines must have a circuit group defined. The circuit group number can be the

same or can be different. In this example, they are different.

Router C and Router D are configured with the same domain, because they must understand one

another’s BPDUs. If they were configured with separate domains, Router D would ignore Router C’s

BPDUs and vice versa.

interface fddi 0

bridge-group 2

interface serial 0

bridge-group 2

bridge-group 2 circuit-group 7

interface serial 1

bridge-group 2

bridge-group 2 circuit-group 7

interface serial 2

bridge-group 2

bridge-group 2 circuit-group 7

bridge 2 domain 3

bridge 2 protocol ieee

Configuration for Router D

interface ethernet 4

bridge-group 5

interface ethernet 5

bridge-group 5

interface serial 0

bridge-group 5

bridge-group 5 circuit-group 4

interface serial 1

bridge-group 5

bridge-group 5 circuit-group 4

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