HP Cisco Nexus 5000 Cisco Nexus 5000 Series Switch CLI Software Configuration - Page 178

Configuring MST Chapter 9 Configuring MST Send feedback to [email protected] To enable a secondary root bridge, perform this task: Step 1 Step 2 Command switch# configure terminal switch(config)# spanning-tree mst instance-id root {primary | secondary} [diameter dia [hello-time hello-time]] Purpose Enters configuration mode. Configures a switch as the secondary root bridge as follows: • For instance-id, you can specify a single instance, a range of instances separated by a hyphen, or a series of instances separated by a comma. The range is from 1 to 4094. • For diameter net-diameter, specify the maximum number of hops between any two end stations. The default is 7. This keyword is available only for MST instance 0. • For hello-time seconds, specify the interval in seconds between the generation of configuration messages by the root bridge. The range is from 1 to 10 seconds; the default is 2 seconds. This example shows how to configure the switch as the secondary root switch for MSTI 5: switch# configure terminal switch(config)# spanning-tree mst 5 root secondary To disable the secondary root bridge configuration, perform this task: Command switch(config)# no spanning-tree mst instance-id root Purpose Returns the switch priority, diameter, and hello-time to default values. Configuring the Port Priority If a loop occurs, MST uses the port priority when selecting an interface to put into the forwarding state. You can assign lower priority values to interfaces that you want selected first and higher priority values to the interface that you want selected last. If all interfaces have the same priority value, MST puts the interface with the lowest interface number in the forwarding state and blocks the other interfaces. To configure the port priority, perform this task: Step 1 Command switch# configure terminal Purpose Enters configuration mode. 9-18 Cisco Nexus 5000 Series Switch CLI Software Configuration Guide OL-16597-01