Spanning-Tree Mst Port-Priority - Cisco IE-3000-8TC Command Reference Manual

Command reference

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spanning-tree mst port-priority

Use the spanning-tree mst port-priority interface configuration command to configure an interface

priority. If a loop occurs, the Multiple Spanning Tree Protocol (MSTP) can find the interface to put in

the forwarding state. Use the no form of this command to return to the default setting.

Syntax Description

The default is 128.

Command Modes

Interface configuration

Command History

Usage Guidelines

You can assign higher priority values (lower numerical values) to interfaces that you want selected first

and lower priority values (higher numerical values) that you want selected last. If all interfaces have the

same priority value, the multiple spanning tree (MST) puts the interface with the lowest interface number

in the forwarding state and blocks other interfaces.

This example shows how to increase the likelihood that the interface associated with spanning-tree

instances 20 and 22 is placed into the forwarding state if a loop occurs:

Switch(config)# interface gigabitethernet1/2

Switch(config-if)# spanning-tree mst 20,22 port-priority 0

You can verify your settings by entering the show spanning-tree mst interface interface-id privileged

EXEC command.

Cisco IE 3000 Switch Command Reference

spanning-tree mst instance-id port-priority priority

no spanning-tree mst instance-id port-priority

Range of spanning-tree instances. You can specify a single instance, a range of

instances separated by a hyphen, or a series of instances separated by a comma. The

range is 0 to 4094.

The range is 0 to 240 in increments of 16. Valid priority values are 0, 16, 32, 48, 64,

80, 96, 112, 128, 144, 160, 176, 192, 208, 224, and 240. All other values are rejected.

The lower the number, the higher the priority.

Modification

This command was introduced.

Chapter 2 IE 3000 Switch Cisco IOS Commands