User's Manual

21-23
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 21 Configuring MSTP
Configuring MSTP Features
Beginning in privileged EXEC mode, follow these steps to configure the switch priority. This procedure
is optional.
To return the switch to its default setting, use the no spanni
ng-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
i
nstances. This procedure is optional.
To return the switch to its default setting, use the no
spanning-tree mst hello-time global configuration
command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
spanning-tree mst instance-id priority priority 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,
245
76, 28672, 32768, 36864, 40960, 45056, 49152,
53248, 57344, and 61440. All other values are rejected.
Step 3
end Return to privileged EXEC mode.
Step 4
show spanning-tree mst instance-id Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
spanning-tree mst hello-time seconds 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 second
s, the range is 1 to 10; the default is 2.
Step 3
end Return to privileged EXEC mode.
Step 4
show spanning-tree mst Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.