mst (STP)

To configure the Multiple Spanning Tree (MST) designated bridge and root bridge priority, use the mst command. To revert to the default settings, use the no form of this command.

mst instance-id [{ designated | root } priority priority-value ]

no mst instance-id [{ designated | root } priority priority-value ]

Syntax Description

instance-id
MST instance. The range is from 0 to 4094.
designated
(Optional) Sets the designated bridge priority for the spanning tree.
root
(Optional) Sets the root bridge priority for the spanning tree.
priority priority-value
(Optional) Specifies the STP-bridge priority; the valid values are 0, 4096 , 8192 , 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440. All other values are rejected.

Command Default

None

Command Modes

Spanning-tree pseudo configuration mode

Command History

Release
Modification
5.1(3)N1(1)
This command was introduced.

Usage Guidelines

You can enter the instance-id argument as a single instance or a range of instances, for example, 0-3,5,7-9.

This command does not require a license.

Examples

This example shows how to configure a spanning-tree domain:

switch# configure terminal
switch(config)# spanning-tree pseudo-information
switch(config-pseudo)# mst 2 designated priority 8192
switch(config-pseudo)# mst 2 root priority 4096
switch(config-pseudo)#
 

Related Commands

Command
Description
show running-config spanning-tree
Displays the running configuration information of the Spanning Tree Protocol (STP).
show spanning-tree
Displays the configuration information of the STP.
spanning-tree pseudo-information
Configures spanning tree pseudo information parameters.