I Commands

instance vlan

To map a VLAN or a set of VLANs to a Multiple Spanning Tree instance (MSTI), use the instance vlan command. To delete the instance and return the VLANs to the default instance (CIST), use the no form of this command.

instance instance-id vlan vlan-id

no instance instance-id vlan vlan-id

Syntax Description

instance-id

Instances to which the specified VLANs are mapped; the range of valid values is from 0 to 4094.

vlan-id

Number of the VLAN that you are mapping to the specified MSTI; the range of valid values is from 1 to 4094.

Command Default

No VLANs are mapped to any MST instance (all VLANs are mapped to the CIST instance).

Command Modes

MST configuration submode

Supported User Roles

network-admin

vdc-admin

Command History

Release

Modification

4.0

This command was introduced.

Usage Guidelines

The vlans vlan-range is entered as a single value or a range.

You cannot map VLANs 3968 to 4047 or 4094 to an MST instance. These VLANs are reserved for internal use by the device.

The mapping is incremental, not absolute. When you enter a range of VLANs, this range is added to or removed from the existing instances.

Any unmapped VLAN is mapped to the CIST instance.


Caution

When you change the VLAN-to-MSTI mapping, the system restarts MST.

This command does not require a license.

Examples

This example shows how to map a range of VLANs to MSTI 4: 

switch(config)# spanning-tree mst configuration
switch(config-mst)# instance 4 vlan 100-200
switch(config-mst)#

Related Commands

Command

Description

show spanning-tree mst configuration

Displays information about the MST protocol.

spanning-tree mst configuration

Enters MST configuration submode.