VTP Concept


The VLAN Management Challenge
As the number of switches increases on a small- or medium-sized business network, the overall administration required to manage VLANs and trunks in a network becomes a challenge.
Small Network VLAN Management
In the animation, the figure shows a network manager adding a new VLAN, VLAN30. The network manager needs to update the three trunks to allow VLANs 10, 20, 30, and 99. Recall that a common error is forgetting to update the allowed list of VLANs on trunks.
Larger Network VLAN Management
When you consider the larger network in the figure, the VLAN management challenge becomes clear. After you have manually updated this network a few times, you may want to know if there is a way for the switches to learn what the VLANs and trunks are so that you do not have to manually configure them. You are ready to learn about VLAN trunking protocol (VTP).
What is VTP?
VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network. The switch can be configured in the role of a VTP server or a VTP client. VTP only learns about normal-range VLANs (VLAN IDs 1 to 1005). Extended-range VLANs (IDs greater than 1005) are not supported by VTP.
VTP Overview
VTP allows a network manager to makes changes on a switch that is configured as a VTP server. Basically, the VTP server distributes and synchronizes VLAN information to VTP-enabled switches throughout the switched network, which minimizes the problems caused by incorrect configurations and configuration inconsistencies. VTP stores VLAN configurations in the VLAN database called vlan.dat.
Benefits of VTP
VLAN configuration consistency across the network
Accurate tracking and monitoring of VLANs
Dynamic reporting of added VLANs across a network
Dynamic trunk configuration when VLANs are added to the network

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