Network Router User Manual

Chapter 3: Bridging Configuration Guide
28 SmartSwitch Router User Reference Manual
Configuring Spanning Tree
Note:
Some commands in this facility require updated SSR hardware. Please refer to
Appendix A for details.
The SSR supports per VLAN spanning tree. By default, all the VLANs defined belong to
the default spanning tree. You can create a separate instance of spanning tree using the
following command:
By default, spanning tree is disabled on the SSR. To enable spanning tree on the SSR, you
perform the following tasks on the ports where you want spanning tree enabled..
Adjusting 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.
Create spanning tree for a VLAN.
pvst create spanningtree vlan-name
<string>
Enable spanning tree on one or
more ports for default spanning
tree.
stp enable port <port-list>
Enable spanning tree on one or
more ports for a particular VLAN.
pvst enable port <port-list> spanning-tree
<string>