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Chapter 2: Bridging Configuration Guide
40 SmartSwitch Router User Reference Manual
Note: If you are running spanning tree on one or more VLANs, you must enable
spanning tree on all ports belonging to each VLAN.
Adjust Spanning-Tree Parameters
You may need to adjust certain spanning-tree parameters if the default values are not
suitable for your bridge configuration. Parameters affecting the entire spanning tree are
configured with variations of the bridge global configuration command. Interface-specific
parameters are configured with variations of the bridge-group interface configuration
command.
You can adjust spanning-tree parameters by performing any of the tasks in the following
sections:
• Set the Bridge Priority
• Set an Interface Priority
Note: Only network administrators with a good understanding of how bridges and the
Spanning-Tree Protocol work should make adjustments to spanning-tree
parameters. Poorly chosen adjustments to these parameters can have a negative
impact on performance. A good source on bridging is the IEEE 802.1d
specification.
Set the Bridge Priority
You can globally configure the priority of an individual bridge when two bridges tie for
position as the root bridge, or you can configure the likelihood that a bridge will be
selected as the root bridge. The lower the bridge's priority, the more likely the bridge will
be selected as the root bridge. This priority is determined by default; however, you can
change it.
To set the bridge priority, enter the following command in Configure mode:
Set a Port Priority
You can set a priority for an interface. When two bridges tie for position as the root bridge,
you configure an interface priority to break the tie. The bridge with the lowest interface
value is elected.
Enable spanning tree on one or
more ports.
stp enable port
<port-list>
Set the bridge priority.
stp set bridging priority
<num>