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Catalyst 2950 and Catalyst 2955 Switch Command Reference

0L-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

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 determine which interface to

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

spanning-tree mst instance-id port-priority priority

no spanning-tree mst instance-id port-priority

Syntax Description

Defaults 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 MST puts the interface with the lowest interface number in the forwarding state

and blocks other interfaces.

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

instance 20 is placed into the forwarding state if a loop occurs:

Switch(config)# interface fastethernet0/2

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

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

EXEC command.

instance-id 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 15.

priority The range is 0 to 240 in increments of 16 (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.

Release Modification

12.1(9)EA1 This command was introduced.

12.1(13)EA1 The values for the instance-id and the priority variables were changed.

12.1(20)EA2 This command was added to the standard software image (SI).

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