Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2(1) (OL-16599-01, March 2009)

Send comments to [e-mail]
2-57
Cisco Nexus 5000 Series Command Reference
OL-16599-01
Chapter 2 Ethernet Commands
spanning-tree mst configuration
spanning-tree mst configuration
To enter the Multiple Spanning Tree (MST) configuration mode, use the spanning-tree mst
configuration command. To return to the default settings, use the no form of this command.
spanning-tree mst configuration
no spanning-tree mst configuration
Syntax Description This command has no keywords or arguments.
Command Default The default value for the MST configuration is the default value for all its parameters:
• No VLANs are mapped to any MST instance (all VLANs are mapped to the CIST instance).
• The region name is an empty string.
• The revision number is 0.
Command Modes Configuration mode
Command History
Usage Guidelines The MST configuration consists of three main parameters:
• Instance VLAN mapping—See the instance vlan command.
• Region name—See the name (MST configuration) command.
• Configuration revision number—See the revision command.
The abort and exit commands allow you to exit MST configuration mode. The difference between the
two commands depends on whether you want to save your changes or not:
• The exit command commits all the changes before leaving MST configuration mode.
• The abort command leaves MST configuration mode without committing any changes.
If you do not map secondary VLANs to the same instance as the associated primary VLAN, when you exit
MST configuration mode, the following warning message is displayed:
These secondary vlans are not mapped to the same instance as their primary:
-> 3
See the switchport mode private-vlan host command to fix this problem.
Changing an MST configuration mode parameter can cause connectivity loss. To reduce service
disruptions, when you enter MST configuration mode, make changes to a copy of the current MST
configuration. When you are done editing the configuration, you can apply all the changes at once by
using the exit keyword.
Release Modification
4.0(0)N1(1a) This command was introduced.