Command Line Interface
4-168
4
show spanning-tree
This command shows the configuration for the common spanning tree (CST) or for 
an instance within the multiple spanning tree (MST).
Syntax 
show spanning-tree [interface | mst instance_id]
• interface 
• ethernet unit/port
- unit - This is device 1. 
- port - Port number. 
• port-channel channel-id (Range: 1-6) 
• instance_id - Instance identifier of the multiple spanning tree. 
(Range: 0-4094, no leading zeroes)
Default Setting 
None
Command Mode 
Privileged Exec
Command Usage 
•Use the show spanning-tree command with no parameters to display the 
spanning tree configuration for the switch for the Common Spanning Tree 
(CST) and for every interface in the tree.
• Use the show spanning-tree interface command to display the spanning tree 
configuration for an interface within the Common Spanning Tree (CST).
•Use the show spanning-tree mst instance_id command to display the 
spanning tree configuration for an instance within the Multiple Spanning Tree 
(MST). 
• For a description of the items displayed under “Spanning-tree information,” 
see “Configuring Global Settings” on page 3-95. For a description of the items 
displayed for specific interfaces, see “Displaying Interface Settings” on 
page 3-99.