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Catalyst 2950 and Catalyst 2955 Switch Command Reference

0L-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

spanning-tree mst configuration

When you map VLANs to an MST instance, the mapping is incremental, and the VLANs specified in

the command are added to or removed from the VLANs that were previously mapped. To specify a range,

use a hyphen; for example, instance 1 vlan 1-63 maps VLANs 1 to 63 to MST instance 1. To specify a

series, use a comma; for example, instance 1 vlan 10, 20, 30 maps VLANs 10, 20, and 30 to MST

instance 1.

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 by using the no form

of the command.

For two or more switches to be in the same MST region, they must have the same VLAN mapping, the

same configuration revision number, and the same name.

Examples This example shows how to enter MST configuration mode, map VLAN 10 to 20 to MST instance 1,

name the region region1, set the configuration revision to 1, display the pending configuration, apply the

changes, and return to global configuration mode:

Switch# spanning-tree mst configuration

Switch(config-mst)# instance 1 vlan 10-20

Switch(config-mst)# name region1

Switch(config-mst)# revision 1

Switch(config-mst)# show pending

Pending MST configuration

Name [region1]

Revision 1

Instance Vlans Mapped

-------- ---------------------

0 1-9,21-4094

1 10-20

-------------------------------

Switch(config-mst)# exit

Switch(config)#

This example shows how to add VLANs 1 to 100 to the ones already mapped (if any) to instance 2, to

move VLANs 40 to 60 that were previously mapped to instance 2 to the CIST instance, to add VLAN

10 to instance 10, and to remove all the VLANs mapped to instance 2 and map them to the CIST instance:

Switch(config-mst)# instance 2 vlan 1-100

Switch(config-mst)# no instance 2 vlan 40-60

Switch(config-mst)# instance 10 vlan 10

Switch(config-mst)# no instance 2

You can verify your settings by entering the show pending MST configuration command.

Related Commands Command Description

show spanning-tree mst configuration Displays the MST region configuration.

1 2 ... 472 473 474 475 476 477 478 479 480 481 482 ... 673 674

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