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VTP helps you simplify management of the VLAN database across multiple switches.VTP is a Cisco-proprietary protocol and is available on most of the Cisco switches. To answer this question, let’s discuss a real and popular network topology.
A transparent switch can add, delete and modify VLAN database locally.
This switch is like the “master” of the whole VTP domain and it is operated in Server mode. Other switches are only allowed to receive and forward updates from the “server” switch. Switches in this mode cannot create, delete or modify VLANs.
In some cases, the network manager doesn’t want a switch to learn VTP information from other switches. In this mode, a switch maintains its own VLAN database and never learn any VTP information from other switches (even from the switch in VTP server mode).
This topic describes the features that VLAN Trunking Protocol (VTP) offers to support VLANs.
To help you understand the basic concept, this is a summary of what VTP is: “VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network” VTP minimizes misconfigurations and configuration inconsistencies that can cause problems, such as duplicate VLAN names or incorrect VLAN-type specifications.
For example, your bosses can sit in any floor and still access Manage VLAN (VLAN 7).
Your technical colleagues can sit anywhere on the floors to access Technical VLAN (VLAN 4). One day, your boss decides to add a new department to your office, the Support Department, and you are tasked to add a new SUPPORT VLAN for this department. Well, without VTP you have to go to each switch to enable this new VLAN.
Let’s start with a basic configuration for all three switches that we know will work. Only the default VLANs currently exist on these switches.
Let’s add VLANs 10, 20, and 30 to verify that VTP is working across all three switches.
Luckily, Cisco always “thinks big” to create a method for you to just sit at the “Main Sw”, adding your new VLANs and magically, other switches automatically learn about this VLAN, sweet, right? How VTP Works To make switches exchange their VLAN information with each other, they need to be configured in the same VTP domain.
Only switches belonging to the same domain share their VLAN information.
I will use the following commands on SW1 only to create three VLANs.