Configuring The Switch Priority - Cisco 3845 - Security Bundle Router Software Manual

Configuring MSTP Features
Note The show spanning-tree mst interface interface-id privileged EXEC command displays information
only for ports that are in a link-up operative state. Otherwise, you can use the show running-config
privileged EXEC command to confirm the configuration.
To return the interface to its default setting, use the no spanning-tree mst instance-id cost interface
configuration command.

Configuring the Switch Priority

You can configure the switch priority and make it more likely that the switch will be chosen as the root
switch.
Exercise care when using this command. For most situations, we recommend that you use the
Note
spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary
global configuration commands to modify the switch priority.
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.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
14-22
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.
Chapter 14 Configuring MSTP
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