Viewing status for a specific MST instance

The following commands display the MSTP statistics for a specified MST instance.

Syntax:


show spanning-tree instance [ist | 1..16]

Displays the MSTP statistics for either the IST instance or a numbered MST instance running on the switch.

Syntax:


show spanning-tree instance [ist | 1..16] detail

Displays status on all active ports for a specific instance of MSTP.

Syntax:


show spanning-tree port-list instance [ist | 1..16] detail
Displays status on specified ports for a specific instance of MSTP.

Viewing status for a specific instance of an MSTP

This shows how to display detailed status for all active ports for a specific instance of MSTP.

switch(config)# show spanning-tree instance 11
 MST Instance Information
  Instance ID : 11
  Mapped VLANs : 111,300
  Switch Priority        : 32768

  Topology Change Count   : 2
  Time Since Last Change  : 4 mins

 Regional Root MAC Address : 1cc1de-cfbc80
 Regional Root Priority    : 32768
 Regional Root Path Cost   : 400000
 Regional Root Port        : This switch is root
 Remaining Hops            : 20
 
                                                          Designated
 Port  Type      Cost      Priority Role       State      Bridge
 ----- --------- --------- -------- ---------- ---------- -------------
 1     10/100TX  200000    128      Root       Forwarding 1cc1de-cfbc80
 2     10/100TX  200000    128      Designated Forwarding 1cc1de-02a700
 3     10/100TX  Auto      112      Designated Forwarding 1cc1de-02a700
 4     10/100TX  Auto      128      Disabled   Disabled
 .        .       .         .          .         .