Chapter 19
| Spanning Tree Commands
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show spanning-tree This command shows the configuration for the common spanning tree (CST), for all
instances within the multiple spanning tree (MST), or for a specific instance within
the multiple spanning tree (MST).
Syntax
show spanning-tree [interface | mst instance-id | brief | stp-enabled-only]
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-28/52)
port-channel channel-id (Range: 1-16)
instance-id - Instance identifier of the multiple spanning tree.
(Range: 0-4094)
brief - Shows a summary of global and interface settings.
stp-enabled-only - Displays global settings, and settings for interfaces for
which STP is enabled.
Default Setting
None
Command Mode
Privileged Exec
Command Usage
â—† 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.
â—† Use the show spanning-tree interface command to display the spanning tree
configuration for an interface within the Common Spanning Tree (CST).
â—† Use the show spanning-tree mst command to display the spanning tree
configuration for all instances within the Multiple Spanning Tree (MST),
including global settings and settings for active interfaces.
â—† Use the show spanning-tree mst instance-id command to display the
spanning tree configuration for an instance within the Multiple Spanning Tree
(MST), including global settings and settings for all interfaces.
Example
Console#show spanning-tree
Spanning Tree Information
---------------------------------------------------------------
Spanning Tree Mode : MSTP
Spanning Tree Enabled/Disabled : Enabled
Instance : 0
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