Cisco Systems 3750E manual Configuring the Switch Priority, Configuring the Hello Time, 19-22

Chapter 19 Configuring MSTP

Configuring MSTP Features

Configuring the Switch Priority

You can configure the switch priority and make it more likely that a standalone switch or a switch in the stack will be chosen as the root switch.

Note Exercise care when using this command. For most situations, we recommend that you use the spanning-tree mst instance-idroot primary and the spanning-tree mst instance-idroot 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	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	spanning-tree mst instance-idpriority 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,
		24576, 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.

To return the switch to its default setting, use the no spanning-tree mst instance-idpriority 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.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
19-22	OL-9775-02