What 's VTP ?

VLAN Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series products.

Note: This document does not cover VTP Version 3. VTP Version 3 differs from VTP Version 1 (V1) and Version 2 (V2), and it is only available on Catalyst OS (CatOS) 8.1(1) or later. VTP Version 3 incorporates many changes from VTP V1 and V2. Make certain that you understand the differences between VTP Version 3 and prior versions before you alter your network configuration.

Refer to one of these sections of the document Configuring VTP for more information:

• Understanding How VTP Version 3 Works

• Interaction with VTP Version 1 and VTP Version 2 (VTP Version 3)

For more details, you may go to CISCO doc

Courtesy from CISCO Systems Page