Cisco Systems 3750E manual Creating an Extended-Range Vlan with an Internal Vlan ID, 13-15

Chapter 13 Configuring VLANs

Configuring Extended-Range VLANs

This example shows how to create a new extended-range VLAN with all default characteristics, enter config-vlan mode, and save the new VLAN in the switch startup configuration file:

Switch(config)# vtp mode transparent

Switch(config)# vlan 2000

Switch(config-vlan)# end

Switch# copy running-config startup config

Creating an Extended-Range VLAN with an Internal VLAN ID

If you enter an extended-range VLAN ID that is already assigned to an internal VLAN, an error message is generated, and the extended-range VLAN is rejected. To manually free an internal VLAN ID, you must temporarily shut down the routed port that is using the internal VLAN ID.

Beginning in privileged EXEC mode, follow these steps to release a VLAN ID that is assigned to an internal VLAN and to create an extended-range VLAN with that ID:

	Command	Purpose
Step 1
	show vlan internal usage	Display the VLAN IDs being used internally by the switch. If the VLAN
		ID that you want to use is an internal VLAN, the display shows the routed
		port that is using the VLAN ID. Enter that port number in Step 3.
Step 2
	configure terminal	Enter global configuration mode.
Step 3
	interface interface-id	Specify the interface ID for the routed port that is using the VLAN ID,
		and enter interface configuration mode.
Step 4
	shutdown	Shut down the port to free the internal VLAN ID.
Step 5
	exit	Return to global configuration mode.
Step 6
	vtp mode transparent	Set the VTP mode to transparent for creating extended-range VLANs.
Step 7
	vlan vlan-id	Enter the new extended-range VLAN ID, and enter config-vlan mode.
Step 8
	exit	Exit from config-vlan mode, and return to global configuration mode.
Step 9
	interface interface-id	Specify the interface ID for the routed port that you shut down in Step 4,
		and enter interface configuration mode.
Step 10
	no shutdown	Re-enable the routed port. It will be assigned a new internal VLAN ID.
Step 11
	end	Return to privileged EXEC mode.
Step 12
	copy running-config startup config	Save your entries in the switch startup configuration file. To save an
		extended-range VLAN configuration, you need to save the VTP
		transparent mode configuration and the extended-range VLAN
		configuration in the switch startup configuration file. Otherwise, if the
		switch resets, it will default to VTP server mode, and the extended-range
		VLAN IDs will not be saved.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		13-15