VTP Configuration

1900 Series Switch

1900Switch(config)#vtp client	Changes the switch to VTP client mode
1900Switch(config)#vtp server	Changes the switch to default VTP server mode
1900Switch(config)#vtp transparent	Changes the switch to VTP transparent mode
1900Switch(config)#vtp domain CNAP	Sets the name of the VTP management domain to CNAP
1900Switch(config)#vtp password cisco	Sets the VTP password to cisco

2900 Series Switch

2900Switch#vlan database	Enters VLAN database mode
2900Switch(vlan)#vtp client	Changes the switch to client mode
2900Switch(vlan)#vtp server	Changes the switch to server mode
2900Switch(vlan)#vtp transparent	Changes the switch to transparent mode
2900Switch(vlan)#vtp domain academy	Sets the name of the VTP management domain to academy
2900Switch(vlan)#vtp password catalyst	Sets the VTP password to catalyst
2900Switch(vlan)#vtp v2-mode	Sets VTP mode to version 2
2900Switch(vlan)#vtp pruning	Enables VTP pruning
2900Switch(vlan)#exit	Applies the changes and exits mode
2900Switch#

2950 Series Switch

2950Switch#config t	Enters global config mode
2950Switch(config)#vtp mode client	Changes the switch to client mode
2950Switch(config)#vtp mode server	Changes the switch to server mode
2950Switch(config)#vtp mode transparent	Changes the switch to transparent mode
2950Switch(config)#vtp domain academy	Sets the name of the VTP management domain to academy
2950Switch(config)#vtp password catalyst	Sets the VTP password to catalyst
2950Switch(config)#vtp v2-mode	Sets VTP mode to version 2
2950Switch(config)#vtp pruning	Enables VTP pruning

Note:

VTP versions 1 and 2 are not interoperable. All switches must use the same version. The biggest difference between version 1 and 2 is that version 2 has support for Token Ring VLANs.

Caution:

Switches that are in client mode update their VLAN database from switches that are in server mode. If you have two or more switches interconnected and you delete a VLAN database, you may find that it becomes updated from a server switch because of your VTP mode.

Another serious problem occurs when you take a new switch in server mode (the default mode) and plug it into an existing network. If the VTP revision number is higher on the new switch, it sends an update to all other switches to overwrite their VLAN database with new informationin this case, an empty VLAN database. You now have a production network with no VLAN information.

Recommended practice is that you put a switch into VTP client mode before adding them into a production network, allow it to receive an update of current VLAN information, and then change it to VTP server mode.