VTP (VLAN Trunking Protocol)

VTP (VLAN Trunking Protocol) is the VLAN Trunking Protocol, also known as VLAN trunk protocol. It is a Cisco proprietary protocol. Role is more than a dozen switches in the enterprise network, configure the VLAN heavy workload, you can use VTP protocol to a switch configured as VTP Server, the other switch configured as a VTP Client, so that they can automatically learn the server on the VLAN information.
Summary of Principles
It is a second layer of the OSI reference model protocol, mainly used to manage the network in the same domain within the establishment of VLANs, delete and rename. On a VTP Server configured a new VLAN, the VLAN configuration information is automatically propagated to all other switches in this area. The switch will automatically receive the configuration information, VLAN configuration to be consistent with the VTP Server, thereby reducing the multiple devices in a VLAN configuration information with the workload, but also to maintain the unity of the VLAN configuration.