GNS3 Lab: Cisco VLAN Trunking Protocol (VTP) Fully Explained For CCNA
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VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol that propagates the definition of Virtual Local Area Networks (VLAN) on the whole local area network. To do this, VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over 802.1Q, and ISL trunks.
VTP Domain, VTP Mode, VTP Password.
VTP Server - Can store, forward, add, delete and change VLAN Info
VTP client- Can Forward, and store VLAN info.
VTP Transparent - it does not save or stores VLAN info, but it forwards it to other switches on the same domain. Can add, delete and change VLAN locally only.
Every time the VTP Server makes a change, it increments the Revision Number and it sends the info to the VTP clients with new RN.
VTP pruning is disabled by default in Cisco switches. VTP pruning helps to send broadcasts only to those trunk links that actually needs the information.
For example, if switch A does not have a port configured for VLAN 7, and broadcast is sent throughout VLAN 7, that broadcast or traffic will not pass through the trunk link to switch A.