Local-Area Networks and LAN Switching - CCIE Routing and Switching Exam Certification Guide - page 144

SR/TLBRouter Configuration
Configuring SR/TLB involves the configuration of SRB and transparent bridging as described
in earlier sections. An additional command ties in the SRB domain with the transparent bridged
domain:

source-bridge transparent ring-group pseudo-ring bridge-number tb-group
The arguments are as follows:
•

ring-group —The virtual ring group number created with the source-bridge ring-group
command.

•

pseudo-ring :—A virtual ring group number created for the transparent bridge group. The
Token Ring side sends frames to this ring number to reach the host in the transparent
bridge side.

•

bridge-number :—A bridge number is assigned for the bridge between the virtual ring
group and the pseudo ring.

•

tb-group :—The transparent bridge group number configured with the bridge-group
command.

To perform SR/TLB the router configuration of the network in Figure 4-25 is displayed in
Example 4-8. The virtual ring group number is 10. From the source-bridge transparent 10 2
5 1 command, you can determine that transparent bridge group 1 uses pseudo ring 2, which is
bridged to virtual ring 10. Bridge number 5 bridges between pseudo ring 2 and virtual ring 10.

Example of SR/TLB Example 4-8

source-bridge ring-group 10
source-bridge transparent 10 2 5 1
!
interface tokenring 0
source-bridge 5 6 10
source-bridge spanning
!
interface ethernet 0
bridge-group 1
!
bridge 1 protocol ieee

The RIF of a source route frame from Host A to reach Host B routes from Ring 5, Bridge 6,
Ring 10, Bridge 5, to Ring 2. In hex, the RIF is 0830.0056.00a5.0020.

RSRB

RSRB permits the bridging of Token Rings that are located on separate routers across non-
Token Ring media. The routers are remotely connected through serial lines, Ethernet, or other