Spanning Tree Commands 4

Command Mode

Interface Configuration (Ethernet Ports 1-8, Port Channel)

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

Console(config)#interface ethernet ethernet 1/5

Console(config-if)#spanning-tree mst 1 port-priority 0

Console(config-if)#

Related Commands

spanning-tree mst cost (4-163)

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 - This is unit 1.

-port - Port number. (Range: 1-8)

•port-channel channel-id(Range: 1-4)

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 eth 1/5

Console#

4-165