Quick Reference Guide

Spanning-Tree Commands 385
DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
instance (mst)
The instance MST Configuration mode command maps VLANS to an MST instance.
Syntax
• instance instance-id {add | remove} vlan vlan-range
• 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 Mode
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.
Console(config)# spanning-tree mst configuration
Console(config-mst)# instance 1 add vlan 10-20