Erasing VLAN Configurations

1900 Series Switch

1900Switch#delete vtp	Deletes all VLAN information from the switch and resets VTP parameters to the factory defaults
or
1900Switch(config)#int fa 0/2
1900Switch(config-if)#no vlan static 2	Removes interface from VLAN 2 and puts it back into default VLAN 1
1900Switch(config-if)#exit
1900Switch(config)#no vlan 2 name Engineering	Removes only VLAN 2 from database
1900Switch(config)#

2900/2950 Series Switch

2900Switch#delete flash:vlan.dat	Removes entire VLAN database from Flash memory Make sure there is no space between the colon (:) and the characters vlan.dat. You can potentially erase the entire contents of Flash memory with this command if the syntax is not correct
2900Switch#delete flash:
Delete filename [ ]? vlan.dat	Removes entire VLAN database from Flash memory
Delete flash:vlan.dat? [confirm]	Press the key
2900Switch#
or
2900Switch#config t
2900Switch(config)#int fa 0/3
2900Switch(config-if)#no switchport access vlan 3	Removes port from VLAN 3 and reassigns it to default VLAN 1
2900Switch(config-if)#exit
2900Switch(config)#exit
2900Switch#vlan database	Enters VLAN database mode
2900(vlan)#no vlan 3	Removes only VLAN 2 from database
2900(vlan)#exit	Applies changes and exits VLAN database mode

Note:

For the 1900 series switch, removing a VLAN from the database does not reassign ports in that VLAN back to the default Management VLAN. You must also go into the specific interface and reassign the ports as well.

Note:

For any series switch, you cannot remove VLAN 1.