Configuring The Hello Time - Cisco Catalyst 3750-X Software Configuration Manual

Chapter 21 Configuring MSTP
Beginning in privileged EXEC mode, follow these steps to configure the switch priority. This procedure
is optional.
Command
Step 1
configure terminal
Step 2
spanning-tree mst instance-id priority priority
Step 3 end
Step 4 show spanning-tree mst instance-id
Step 5
copy running-config startup-config
To return the switch to its default setting, use the no spanning-tree mst instance-id priority global
configuration command.

Configuring the Hello Time

You can configure the interval between the generation of configuration messages by the root switch by
changing the hello time.
Beginning in privileged EXEC mode, follow these steps to configure the hello time for all MST
instances. This procedure is optional.
Command
Step 1
configure terminal
Step 2 spanning-tree mst hello-time seconds
Step 3 end
Step 4 show spanning-tree mst
Step 5
copy running-config startup-config
To return the switch to its default setting, use the no spanning-tree mst hello-time global configuration
command.
OL-21521-01
Purpose
Enter global configuration mode.
Configure the switch priority.
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 0 to 4094.
For priority, the range is 0 to 61440 in increments of
•
4096; the default is 32768. The lower the number, the
more likely the switch will be chosen as the root switch.
Priority values are 0, 4096, 8192, 12288, 16384, 20480,
24576, 28672, 32768, 36864, 40960, 45056, 49152,
53248, 57344, and 61440. All other values are rejected.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Configure the hello time for all MST instances. The hello time
is the interval between the generation of configuration
messages by the root switch. These messages mean that the
switch is alive.
For seconds, the range is 1 to 10; the default is 2.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Configuring MSTP Features
21-23