Configuring The Switch Priority - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Configuring MST
Command
Step 3
Router(config-if)# spanning-tree mst instance_id
cost cost
Step 4
Router(config-if)# end
Step 5
Router# show spanning-tree mst interface
interface_id
or
Router# show spanning-tree mst instance_id
Step 6
Router# copy running-config startup-config
The show spanning-tree mst interface interface_id privileged EXEC command displays information
Note
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 so that it is more likely that a switch is chosen as the root bridge.
Note Exercise care when using this command. For most situations, we recommend that you use the
spanning-tree mst instance_id root primary and the spanning-tree mst instance_id root secondary
global configuration commands to modify the switch priority.
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
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Chapter 17
Purpose
Configures the cost.
If a loop occurs, MST uses the path cost when selecting
an interface to place into the forwarding state. A lower
path cost represents higher-speed transmission.
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 cost, the range is 1 to 200000000; the default
•
value is derived from the media speed of the
interface.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.
Configuring STP and MST
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