Cisco Systems BC-109 Configure SRB over FDDI, Enable SRB and Assign a Ring Group to an Interface

Configure SRB over FDDI

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:

Command	Purpose
source-bridgelocal-ring bridge-number target-ring	Enable source-route bridging and
	assign a ring group to a Token Ring
	interface.

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.

Figure 48 Autonomous FDDI SRB

Token	FDDI	Token
Ring		Ring

Virtual ring

S3227

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

Step	Command	Purpose
1	interface fddi slot/port	Configure an FDDI interface.
2	source-bridgelocal-ring bridge-number	Enable source-route bridging.
	target-ring
3	source-bridge route-cache cbus	Enable autonomous switching.

Configuring Source-Route Bridging BC-113