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Catalyst 2950 and Catalyst 2955 Switch Command Reference

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Chapter 2 Cisco IOS Commands

spanning-tree mst configuration

Use the spanning-tree mst configuration global configuration command to enter multiple

spanning-tree (MST) configuration mode through which you configure the MST region. Use the no form

of this command to return to the default settings.

spanning-tree mst configuration

no spanning-tree mst configuration

This command is available only if your switch is running the enhanced software image (EI).

Syntax Description This command has no arguments or keywords.

Defaults The default mapping is that all VLANs are mapped to the common and internal spanning tree (CIST)

instance (instance 0).

The default name is an empty string.

The revision number is 0.

Command Modes Global configuration

Command History

Usage Guidelines Entering the spanning-tree mst configuration command enables the MST configuration mode. These

configuration commands are available:

• abort: exits the MST region configuration mode without applying configuration changes.

• exit: exits the MST region configuration mode and applies all configuration changes.

• instance instance-id vlan vlan-range: maps VLANs to an MST instance. The range for the

instance-id is 1 to 15; the range for vlan-range is 1 to 4094. Do not enter leading zeros.

• name name: sets the configuration name. The name string has a maximum length of 32 characters

and is case sensitive.

• no: negates the instance, name, and revision commands or sets them to their defaults.

• private-vlan: Though visible in the command-line help strings, this command is not supported.

• revision version: sets the configuration revision number. The range is 0 to 65535.

• show [current | pending]: displays the current or pending MST region configuration.

When you map VLANs to an MST instance, the mapping is incremental, and the range of VLANs

specified is added or removed to the existing ones. To specify a range, use a hyphen; for example,

instance 1 vlan 1-63 maps VLANs 1 to 63 to MST instance 1. To specify a series, use a comma; for

example, instance 1 vlan 10, 20, 30 maps VLANs 10, 20, and 30 to MST instance 1.

Release Modification

12.1(9)EA1 This command was first introduced.