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VTP (VLAN Trunking Protocol)

A VLAN (Virtual LAN) allows a network administrator to partition a LAN to conform to the business functions of the organization without physically modifying the network.

A VLAN is created by configuring some ports on network switches to be in the same broadcast domain. Other ports on the network switches can be configured into a different VLAN by configuring them into their same broadcast domain.

If a port on a network switch is connected to another switch, it is called a trunk and can carry multiple VLANS. Devices on one VLAN can't see the devices on a different VLAN without going through a router. Based upon the 802.1Q standard, the data frames of each VLAN are identified by a 12-bit tag, allowing 4,096 different VLANS on the same LAN.

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol that advertises the VLAN configuration through all the switches in a domain. This allows an administrator to configure VLANs on a single VTP server, easing the administration of a network.

VTP operates in three modes:

In Server mode the VTP server can receive and send advertisements within the entire VTP domain. An administrator can create, modify, and delete VLANs and other configuration parameters for the entire VTP domain. When you make a change to the VLAN configuration on a VTP server, the change is transmitted out all trunk connections.

In Client mode an administrator can receive VTP advertisements from other switches and learn the VLAN configuration of the network, but cannot send VTP advertisements and so cannot create, change, or delete VLANs.

In Transparent mode an administrator can create, delete, and modify VLANs, but the changes are not transmitted to other switches in the domain, they affect only the local switch.

More Networking Protocols and Standards:
• A Simple Description of the IPv6 Header and Datagram
• IEEE 802 Standards Specify the Basics of Physical and Logical Networking
• Network Gateways
• Networking Protocols, Ports, Standards, and Organizations What Does it All Mean?
• Video - Network Layer (Layer 3) of OSI Networking Model
• Comparison of the Layers of the OSI and TCP/IP Models
• Dynamic Host Configuration Protocol (DHCP) Explained
• Network Operating Systems
• What is PPP, PPPoA and PPPoE?
• Free eBook: IPv6 Addressing

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