Cisco Systems 3750E Spanning-tree port-priority priority, Show spanning-tree vlan vlan-id, 18-19

Chapter 18 Configuring STP

Configuring Spanning-Tree Features

Note If your switch is a member of a switch stack, you must use the spanning-tree[vlan vlan-id] cost cost interface configuration command instead of the spanning-tree[vlan vlan-id] port-prioritypriority interface configuration command to select an interface to put in the forwarding state. Assign lower cost values to interfaces that you want selected first and higher cost values that you want selected last. For more information, see the “Configuring Path Cost” section on page 18-20.

Beginning in privileged EXEC mode, follow these steps to configure the port priority of an interface. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	interface interface-id	Specify an interface to configure, and enter interface
		configuration mode.
		Valid interfaces include physical ports and port-channel
		logical interfaces (port-channelport-channel-number).
Step 3
	spanning-tree port-priority priority	Configure the port priority for an interface.
		For priority, the range is 0 to 240, in increments of 16; the
		default is 128. Valid values are 0, 16, 32, 48, 64, 80, 96,
		112, 128, 144, 160, 176, 192, 208, 224, and 240. All other
		values are rejected. The lower the number, the higher the
		priority.
Step 4
	spanning-tree vlan vlan-idport-priority priority	Configure the port priority for a VLAN.
		• For vlan-id, you can specify a single VLAN identified
		by VLAN ID number, a range of VLANs separated by
		a hyphen, or a series of VLANs separated by a comma.
		The range is 1 to 4094.
		• For priority, the range is 0 to 240, in increments of 16;
		the default is 128. Valid values are 0, 16, 32, 48, 64, 80,
		96, 112, 128, 144, 160, 176, 192, 208, 224, and 240.
		All other values are rejected. The lower the number,
		the higher the priority.
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show spanning-tree interface interface-id	Verify your entries.
	or
	show spanning-tree vlan vlan-id
Step 7
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

Note The show spanning-tree interface interface-idprivileged EXEC command displays information only if the port is in a link-up operative state. Otherwise, you can use the show running-config interface privileged EXEC command to confirm the configuration.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		18-19