Quick Reference Guide

Spanning Tree (STP) Commands | 321
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.
Format show spanning-tree <brief>
Mode Privileged EXEC and User EXEC
Bridge Priority Configured value.
Bridge Identifier
Time Since Topology Change in seconds
Topology Change Count Number of times changed.
Topology Change Boolean value of the Topology Change parameter for the switch indicat-
ing if a topology change is in progress on any port assigned to the com-
mon and internal spanning tree.
Designated Root
Root Path Cost Value of the Root Path Cost parameter for the common and internal span-
ning tree.
Root Port Identifier
Root Port Max Age Derived value
Root Port Bridge Forward Delay Derived value
Hello Time Configured value
Bridge Hold Time Minimum time between transmission of Configuration Bridge Protocol
Data Units (BPDUs)
Bridge Max Hops Bridge max-hops count for the device.
CST Regional Root
Regional Root Path Cost
Associated FIDs List of forwarding database identifiers currently associated with this instance.
Associated VLANs List of VLAN IDs currently associated with this instance.
When the “brief” optional parameter is included, this command displays spanning tree settings for the
bridge. In this case, the following details are displayed.
Bridge Priority Configured value.
Bridge Identifier
Bridge Max Age TConfigured value.
Bridge Max Hops Bridge max-hops count for the device.
Bridge Hello Time Configured value.
Bridge Forward Delay Configured value.
Bridge Hold Time Minimum time between transmission of Configuration
Bridge Protocol Data Units (BPDUs)
show spanning-tree interface
This command displays the settings and parameters for a specific switch port within the common and
internal spanning tree. The <unit/slot/port> is the desired switch port. The following details are
displayed on execution of the command.