VLAN Trunk Protocol
VLAN Trunk Protocol (VTP) is a Cisco-proprietary messaging protocol that occurs between devices on trunk ports. It allows VLAN information to be propagated across your switched network, providing a consistent VLAN configuration in your network. This process makes it easy to add, change, and delete VLANs as well as to add new devices to the network because your VLAN information is automatically propagated by switches that understand VTP on their trunk ports. This removes any possibility of inconsistencies between VLAN configurations that might result in security violations or errors. These problems can occur when VLANs become cross-connected as duplicate VLAN names are configured or when VLANs become internally disconnected ...
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