Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)

Configuring the Hello Time
You can configure the interval between the generation of configuration messages by the root bridge for all
instances on the switch by changing the hello time.
Exercise care when using this command. For most situations, we recommend that you enter the
spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary
configuration commands to modify the hello time.
Note
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Configures the hello time for all MST instances. The hello
time is the interval between the generation of configuration
switch(config)# spanning-tree mst
hello-time seconds
Step 2
messages by the root bridge. These messages mean that the
switch is alive. For seconds, the range is from 1 to 10, and
the default is 2 seconds.
This example shows how to configure the hello time of the switch to 1 second:
switch# configure terminal
switch(config)# spanning-tree mst hello-time 1
Configuring the Forwarding-Delay Time
You can set the forward delay timer for all MST instances on the switch with one command.
Procedure
PurposeCommand or Action
Enters configuration mode.switch# configure terminal
Step 1
Configures the forward time for all MST instances. The
forward delay is the number of seconds that a port waits
switch(config)# spanning-tree mst
forward-time seconds
Step 2
before changing from its spanning tree blocking and learning
states to the forwarding state. For seconds, the range is from
4 to 30, and the default is 15 seconds.
This example shows how to configure the forward-delay time of the switch to 10 seconds:
switch# configure terminal
switch(config)# spanning-tree mst forward-time 10
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01 193
Configuring MST
Configuring the Hello Time