Use the show spanning-tree mst command to display MST
information.
Example: Displaying MST Configuration Information
This example
shows how to display MST configuration information. This includes MST region
name, revision number and VLAN to MST instances (MSTI) mapping:

Example: Displaying General MST Information
This example shows
how to display general MST information. Notice that the output is grouped by
MSTIs starting with the Internal Spanning-Tree (IST):

Example: Displaying MST Information for a Specific Instance
Switch#show spanning-tree mst 1
Example: Displaying MST Information for a Specific
Interface
This example displays MST information for a specific
interface:
Switch#show spanning-tree mst interface
fastethernet 4/4
Example: Displaying MST
Information for a Specific Instance and Interface
This example displays
MST information for a specific interface and a specific MSTI:
Switch#show spanning-tree mst 1 interface fastethernet
4/4
Example: Displaying Detailed MST
Information
This example displays detailed MST information for a
specific instance:
Switch#show spanning-tree mst 1
detail