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224 CHAPTER 15: SPANNING-TREE COMMANDS
instance (mst) The instance MST Configuration mode command maps VLANS to an
MST instance.
Syntax
instance instance-id {add | remove} vlan vlan-range
Parameters
■ instance-ID—ID of the MST instance (Range: 1-15).
■ vlan-range—VLANs to be added to or removed from the specified
MST instance. To specify a range of VLANs, use a hyphen. To specify a
series of VLANs, use a comma. (Range: 1-4094).
Default Configuration
VLANs are mapped to the common and internal spanning tree (CIST)
instance (instance 0).
Command Modes
MST Configuration mode
User Guidelines
All VLANs that are not explicitly mapped to an MST instance are mapped
to the common and internal spanning tree (CIST) instance (instance 0)
and cannot be unmapped from the CIST.
For two or more devices to be in the same MST region, they must have
the same VLAN mapping, the same configuration revision number, and
the same name.
Example
The following example maps VLANs 10-20 to MST instance 1.
name (mst) The name MST Configuration mode command defines the configuration
name. To restore the default setting, use the no form of this command.
Console(config)# spanning-tree mst configuration
Console(config-mst)# instance 1 add vlan 10-20