HP Cisco Nexus 5000 Cisco Nexus 5000 Series Switch CLI Software Configuration - Page 176

Configuring MST Chapter 9 Configuring MST Send feedback to [email protected] Mapping Secondary VLANs to Same MSTI as Primary VLANs for Private VLANs When you are working with private VLANs on the system, all secondary VLANs must be in the same MSTI and their associated primary VLAN. To accomplish this synchronization automatically, perform this task: Step 1 Step 2 Step 3 Command switch# configure terminal switch(config)# spanning-tree mst configuration switch(config-mst)# private-vlan synchronize Purpose Enters configuration mode. Enters MST configuration submode. Automatically maps all secondary VLANs to the same MSTI and their associated primary VLAN for all private VLANs. This example shows how to automatically map all the secondary VLANs to the same MSTI as their associated primary VLANs in all private VLANs: switch# configure terminal switch(config)# spanning-tree mst configuration switch(config-mst)# private-vlan synchronize Configuring the Root Bridge You can configure the switch to become the root bridge. Note The root bridge for each MSTI should be a backbone or distribution switch. Do not configure an access switch as the spanning tree primary root bridge. Enter the diameter keyword, which is available only for MSTI 0 (or the IST), to specify the network diameter (that is, the maximum number of hops between any two end stations in the network). When you specify the network diameter, the switch automatically sets an optimal hello time, forward-delay time, and maximum-age time for a network of that diameter, which can significantly reduce the convergence time. You can enter the hello keyword to override the automatically calculated hello time. Note With the switch configured as the root bridge, do not manually configure the hello time, forward-delay time, and maximum-age time using the spanning-tree mst hello-time, spanning-tree mst forward-time, and spanning-tree mst max-age global configuration commands. 9-16 Cisco Nexus 5000 Series Switch CLI Software Configuration Guide OL-16597-01