Chapter 19
| Spanning Tree Commands
– 520 –
spanning-tree
protocol-migration
This command re-checks the appropriate BPDU format to send on the selected
interface.
Syntax
spanning-tree protocol-migration interface
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-28/52)
port-channel channel-id (Range: 1-26)
Command Mode
Privileged Exec
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 ethernet 1/5
Console#
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]
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-28/52)
port-channel channel-id (Range: 1-26)
instance-id - Instance identifier of the multiple spanning tree.
(Range: 0-4094, no leading zeroes)
Default Setting
None
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