Quick Reference Guide

310 | Spanning Tree (STP) Commands
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show spanning-tree
This command displays spanning tree settings for the common and internal spanning tree.
Syntax
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Mode
Privileged Exec and User Exec
Example 1
Figure 19-111. Example Output from show spanning-tree Command
When the optional keyword brief is not included in the command, the following details are displayed:
Report Fields 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.
Force10#show spanning-tree
Bridge Priority................................ 32768
Bridge Identifier.............................. 80:00:00:01:E8:D5:A2:19
Time Since Topology Change..................... 0 day 0 hr 46 min 23 sec
Topology Change Count.......................... 0
Topology Change in progress.................... FALSE
Designated Root................................ 80:00:00:01:E8:D5:A2:19
Root Path Cost................................. 0
Root Port Identifier........................... 00:00
Bridge Max Age................................. 20
Bridge Max Hops................................ 20
Bridge Forwarding Delay........................ 15
Hello Time..................................... 2
Bridge Hold Time............................... 3
CST Regional Root.............................. 80:00:00:01:E8:D5:A2:19
Regional Root Path Cost........................ 0
Associated FIDs Associated VLANs
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