Command Usage
If at any time the switch detects STP BPDUs, including Configuration or
Topology Change Notification BPDUs, it will automatically set the
selected interface to forced STP-compatible mode. However, you can also
use the spanning-tree protocol-migration command at any time to
manually re-check the appropriate BPDU format to send on the selected
interfaces (i.e., RSTP or STP-compatible).
Example
Console#spanning-tree protocol-migration eth 1/5
Console#
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
• 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.
- unit - Stack unit. (Range: 1-8)
- port - Port number. (Range: 1-26)
C
L
OMMAND
INE
I
NTERFACE
4-227