Configuring The Port Priority; Configuring A Secondary Root Bridge - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Configuring a Secondary Root Bridge

This example shows how to configure the switch as the root switch for MSTI 5:
switch# configure terminal
switch(config)# spanning-tree mst 5 root primary
Configuring a Secondary Root Bridge
You can execute this command on more than one switch to configure multiple backup root bridges. Enter the
same network diameter and hello-time values that you used when you configured the primary root bridge with
the spanning-tree mst root primary configuration command.
Procedure
Step 1
Step 2
Step 3
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

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.
Procedure
Step 1
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
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Command or Action
switch# configure terminal
switch(config)# spanning-tree
mst instance-id root {primary |
secondary} [diameter dia
[hello-time hello-time]]
switch(config)# no spanning-tree
mst instance-id root
Command or Action
switch# configure terminal
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.
(Optional)
Returns the switch priority, diameter, and hello-time to default
values.
Purpose
Enters configuration mode.
Configuring MST
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