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260 Spanning Tree (STP) Commands
show spanning-tree
• spanning-tree max-age on page 269
• spanning-tree max-hops on page 269
• spanning-tree mst on page 269
• no spanning-tree mst on page 270
• spanning-tree mst instance on page 271
• spanning-tree mst priority on page 271
• spanning-tree mst vlan on page 272
• spanning-tree port mode enable on page 272
• spanning-tree port mode enable all on page 273
show spanning-tree
This command displays spanning tree settings for the common and internal spanning tree,
when the optional parameter “brief” is not included in the command. The following details
are displayed.
Syntax
show spanning-tree brief
Mode
Privileged Exec and User Exec
Bridge Priority—Specifies the bridge priority for the spanning tree.
Bridge Identifier—The bridge identifier for the selected instance.
Time Since Topology Change—The time in seconds since the topology last changed.
Topology Change Count—Number of times the topology has changed.
Topology Change in progress—Boolean value of the Topology Change parameter for the switch
indicating if a topology change is in progress on any port assigned to the common and internal spanning
tree.
Designated Root—The bridge identifier of the root bridge. It is derived from the bridge priority and the
base MAC address of the bridge.
Root Path Cost—Value of the Root Path Cost parameter for the common and internal spanning tree.
Root Port Identifier—Port to access the Designated Root.
Bridge Max Age—Specifies the bridge maximum age for the spanning tree.
Bridge Forwarding Delay—Specifies the time spent in “Listening and Learning” mode before forwarding
packets. Bridge Forwarding Delay must be greater or equal to “(Bridge Max Age/2) + 1”. The time range
is from 4 seconds to 30 seconds. The default value is 15.
Hello Time—Configured value of the parameter for common spanning tree.