HP Cisco MDS 9222i Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2 - Page 205

Chapter 2 Ethernet Commands spanning-tree mst configuration Send comments to [email protected] 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 Release 4.0(0)N1(1a) Modification This command was introduced. 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. OL-16599-01 Cisco Nexus 5000 Series Command Reference 2-57