Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree mst configuration
spanning-tree mst configurat ion
To enter the MST configuratio n submode, use the spanning-tree mst configuration command. To return
to the default MST configuration, use the no form of this command.
spanning-tree mst configuration
no spanning-tree mst configuration
Syntax Description This command has no arguments or keywo rds.
Defaults T he default settings are as follows:
• No VLANs are mapped to any MST instance.
• All VLANs are mapped to the CIST instance.
• The regio n name is an empty string .
• The revision number is 0.
Command Modes Global c onfiguratio n mode
Usage Guidelines T he MST configuration c onsists of three main par ameters:
• Instance VLAN mapping (see the instance command)
• Region na me (see the name command)
• Con figuration revision numbe r (see the revision command)
By default, the value for the MST configuration is the default value for all its parameters.
The abort and exit commands allow you to exit the MST configuration submode. The difference
between the two commands depe nds on whether you want to save your c hanges or not.
The exit command commits all the changes before leaving MST configuration submode. If you do not
map the secondary VLANs to the same instance as the associate d primary VLAN, when yo u exit th e MST
configuration submode, a message displays and lists the secondary VLANs that are not mapped to the
same instance as the associated primary VLAN. The message is as follows:
These secondary vlans are not mapped to the same instance as their primary:
->3
The abort command leaves the MST configuration submode without committing any changes.