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 (Common and Internal Spanning Tree [CIST]), use the no form of this command.

instance instance-id vlan vlan-id

no instance instance-id [vlan vlan-id]

Syntax Description


Instances to which the specified VLANs are mapped. The range is from 0 to 4094.

vlan vlan-id

Specifies the number of the VLANs that you are mapping to the specified MSTI. The VLAN ID range 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 mode

Command History



This command was introduced.

Usage Guidelines

The VLAN identifier is entered as a single value or a range.

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 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  

Related Commands


show spanning-tree mst configuration

Displays information about the MST protocol.

spanning-tree mst configuration

Enters MST configuration mode.