VTP (VLAN Trunking Protocol)

VTP  is a Cisco proprietary protocol that allows for the dynamic sharing of VLAN information between switches.

VTP allows network administrators to configure VLANs on a single switch and have that information automatically propagate to other switches in the network.

This makes it easier to maintain a consistent VLAN configuration throughout the network and helps to reduce the potential for errors or inconsistencies.

Here are the basic commands to configure VTP on a Cisco switch:

1. Set the VTP mode:

    Switch(config)# vtp mode {server | client | transparent}

• Server mode: Allows the switch to create, modify, and delete VLANs and share this information with other switches.
• Client mode: Allows the switch to receive VLAN information from a VTP server but does not allow the switch to make any changes to the VLAN database.
• Transparent mode: Allows the switch to forward VTP messages but does not participate in VTP domain management.

2. Set the VTP domain name:

    Switch(config)# vtp domain domain_name

• The domain name must match on all switches in the VTP domain.

3. Set the VTP password (optional):

    Switch(config)# vtp password password

• The password must match on all switches in the VTP domain.

4. Enable VTP pruning (optional):

     Switch(config)# vtp pruning

• VTP pruning prevents the flooding of broadcast traffic in VLANs that are not needed on a particular trunk link.

5. Configure VLANs (optional):

     Switch(config)# vlan vlan_number

     Switch(config-vlan)# name vlan_name

• You can create VLANs manually or allow VTP to dynamically create them.

6. Configure the VTP ver
   sion (optional):

     Switch(config)# vtp version version_number

• By default, Cisco switches use version 1. You can also use version 2, which includes additional features such as support for extended VLANs.

Note: 

Remember to save the configuration changes with the copy running-config startup-config command.