Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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9-15
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 9 Configuring MST
Configuring MST
Instances configured 2
Instance Vlans Mapped
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0 1-9,21-4094
1 10-20
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Mapping and Unmapping VLANs to MST Instances
Caution When you change the VLAN-to-MSTI mapping, the system restarts MST.
Note You cannot disable an MSTI.
For two or more bridges to be in the same MST region, they must have the identical MST name,
VLAN-to-instance mapping, and MST revision number.
To map VLANs to MST instances, perform this task:
This example shows how to map VLAN 200 to MSTI 3:
switch# configure terminal
switch(config)# spanning-tree mst configuration
switch(config-mst)# instance 3 vlan 200
To unmap VLAN to MST instances, perform this task:
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# spanning-tree mst
configuration
Enters MST configuration submode.
Step 3
switch(config-mst)# instance instance-id
vlan vlan-range
Maps VLANs to an MST instance, as follows:
• For instance_id, the range is from 1 to 4094.
Instance 0 is reserved for the IST for each MST
region.
• For vlan-range, the range is from 1 to 4094.
When you map VLANs to an MSTI, the mapping
is incremental, and the VLANs specified in the
command are added to or removed from the
VLANs that were previously mapped.
Command Purpose
switch(config-mst)# no instance
instance-id vlan vlan-range
Deletes the specified instance and returns the VLANs
to the default MSTI, which is the CIST.