S
PANNING
T
REE
C
OMMANDS
4-213
Command Usage
• This command defines the priority for the use of an interface in the
multiple spanning-tree. If the path cost for all interfaces on a switch
are the same, the interface with the highest priority (that is, lowest
value) will be configured as an active link in the spanning tree.
• Where more than one interface is assigned the highest priority, the
interface with lowest numeric identifier will be enabled.
Example
Related Commands
spanning-tree mst cost (4-211)
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 - Stack unit. (Range: 1-8)
• port - Port number. (Range: 1-26/50)
• port-channel channel-id (Range: 1-32)
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).
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree mst 1 port-priority 0
Console(config-if)#
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