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Configure Source-Route Bridging

BC-110

Bridging and IBM Networking Configuration Guide

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:

• 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

A dual-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

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:

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.

Command Purpose

source-bridge local-ring bridge-number target-ring Enable local source-route bridging on

a Token Ring interface.

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Cisco Systems BC-109 Manual de usuario Pagina 2