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Configure Source-Route Bridging
BC-116
Bridging and IBM Networking Configuration Guide
To create a bridge group that runs an automatic spanning-tree function compatible with the IBM
SRB spanning-tree implementation, use the following command in global configuration mode:
To enable the automatic spanning-tree function for a specified group of bridged interfaces, use the
following command in interface configuration mode:
To assign a path cost for a specified interface, use the following command in interface configuration
mode:
Note Ports running IEEE and IBM protocols form a spanning tree together on the LAN, but they
do not mix in the router itself. Make sure the configurations are correct and that each LAN runs only
one protocol.
See the end of this chapter for an example of source-route bridging with the automatic spanning-tree
function enabled.
Limit the Maximum SRB Hops
You can minimize explorer storms if you limit the maximum number of source-route bridge hops.
For example, if the largest number of hops in the best route between two end stations is six, it might
be appropriate to limit the maximum source-route bridging hops to six to eliminate unnecessary
traffic. This setting affects spanning-tree explorers and all-routes explorers sent from source devices.
To limit the number of SRB hops, use one of the following commands in interface configuration
mode:
Command Purpose
bridge bridge-group protocol ibm Create a bridge group that runs the
automatic spanning-tree function.
Command Purpose
source-bridge spanning bridge-group Enable the automatic spanning-tree
function on a group of bridged
interfaces.
Command Purpose
source-bridge spanning bridge-group path-cost path-cost Assign a path cost for a specified
group of bridged interfaces.
Command Purpose
source-bridge max-hops count Control the forwarding or blocking of
all-routes explorer frames received
on this interface.
source-bridge max-in-hops count Control the forwarding or blocking of
spanning-tree explorer frames
received on this interface.
source-bridge max-out-hops count Control the forwarding or blocking of
spanning-tree explorer frames sent
from this interface.