Cisco Systems BC-109 Manual De Usuario

 Configuring Source-Route Bridging BC-113

Enable SRB and Assign a Ring Group to an Interface

After you have defined a ring group, you must assign that ring group to those interfaces you plan to 
include in that ring group. An interface can only be assigned to one ring group. To enable any-to-any 
connectivity among the end stations connected through this multiport bridge, you must assign the 
same target ring number to all Token Ring interfaces on the router. 

To enable SRB and assign a ring group to an interface, use the following command in interface 
configuration mode:

Configure SRB over FDDI

Cisco’s implementation of SRB expands the basic functionality to allow autonomous switching of 
SRB network traffic for FDDI interfaces, adding counters to SRB accounting statistics, and 
implementing process-level switching of SRB over FDDI. This functionality provides a significant 
increase in performance for Token Rings interconnected across an FDDI backbone (see Figure 48).

SRB over FDDI is supported on the Cisco 4000-M, Cisco 4500-M, Cisco 4700-M, Cisco 7000 
series, Cisco 7200 series, and Cisco 7500 routers.

To configure autonomous FDDI SRB, use the following commands, beginning in global 
configuration mode:

source-bridge local-ring bridge-number target-ring

Enable source-route bridging and 
assign a ring group to a Token Ring 
interface.

interface fddi slot/port 

Configure an FDDI interface.

source-bridge local-ring bridge-number 
target-ring

Enable source-route bridging.

Enable autonomous switching.

FDDI

Token

Ring

Token

Ring

Virtual
ring

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