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Saturday, January 19, 2019

VTP (VLAN Trunking Protocol) and how VTP works

VTP (VLAN Trunking Protocol):-

VTP stands for VLAN Trunking Protocol. VLAN trunking protocol is a Cisco proprietary protocol and it’s used by Cisco switches to exchange VLAN information. By the help of VTP, we can synchronize VLAN information with switches inside the same VTP domain. For example we can synchronize VLAN id or VLAN name. VTP uses layer 2 frames to manage the addition and deletion and renaming of VLANs from switches in the VTP client mode.
Suppose we have 100 switches. Without VTP, if we want to create a VLAN on each switch, we would have to manually enter commands to create the VLAN only on one switch. That switch can then propagate information about that VLAN to each switch on a network and cause other switches to create that VLAN too. If you want to delete a VLAN, we only need to delete it on one switch and the change is automatically propagated to every other switch inside the same VTP domain.

How VTP works:-

We have three switches and we have created a new VLAN on SW1. SW1 sends a VTP update to SW2 and SW2 sends own VTP update to SW3. Now all three switches have the same VLAN.

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