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ThinkMo EDU Share – network 145.Configuring VTP with Support for Two Modes

ThinkMo No Comments 06/15/2023

ThinkMo EDU Share – network 145.Configuring VTP with Support for Two Modes

VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol used for managing VLAN configurations across a network infrastructure. VTP simplifies VLAN management by allowing VLAN information to be dynamically propagated to switches within a VTP domain. In this article, we will explore the two modes supported by VTP and discuss their configurations and implications in network environments.

VTP Server Mode:
VTP Server mode is the default mode for a switch running VTP. In this mode, the switch is responsible for creating, modifying, and deleting VLANs. Any changes made to the VLAN database on a VTP Server switch are propagated to other switches within the same VTP domain. To configure a switch as a VTP Server, the following steps can be followed:

a. Access the switch’s command-line interface (CLI) or graphical user interface (GUI).
b. Enter the global configuration mode.
c. Issue the “vtp mode server” command to set the switch to VTP Server mode.
d. Optionally, configure a VTP domain name using the “vtp domain [name]” command.
e. Create, modify, or delete VLANs using the appropriate commands.
f. Save the configuration changes.

VTP Client Mode:
VTP Client mode is used for switches that receive VLAN updates from VTP Server switches within the same VTP domain. In this mode, VLAN configurations cannot be modified locally on the switch. Instead, any VLAN changes must be made on the VTP Server switch, and the changes will be automatically updated on VTP Client switches. To configure a switch as a VTP Client, the following steps can be followed:

a. Access the switch’s CLI or GUI.
b. Enter the global configuration mode.
c. Issue the “vtp mode client” command to set the switch to VTP Client mode.
d. Optionally, configure a VTP domain name using the “vtp domain [name]” command.
e. Save the configuration changes.

Implications and Considerations:
It is important to understand the implications and considerations when configuring VTP modes in a network environment. Here are a few key points to keep in mind:

VTP Revision Number: The VTP revision number determines which VLAN information is considered more recent. When a switch with a higher VTP revision number is introduced into the network, its VLAN database overrides lower revision numbers. Care should be taken to prevent unintended VLAN deletions or modifications when introducing a new VTP Server.

Pruning and Transparency: VTP pruning is a feature that allows switches to dynamically remove unnecessary broadcast traffic from trunk links. However, VTP transparent mode should be used when deploying switches in environments where VLAN information needs to be locally configured and not propagated.

VTP supports two modes, VTP Server and VTP Client, for managing VLAN configurations across a network. VTP Server mode enables VLAN creation, modification, and deletion, with updates automatically propagated to VTP Client switches. VTP Client mode receives VLAN updates from VTP Servers and does not allow local VLAN configuration changes. By understanding these modes and their configurations, network administrators can effectively manage VLANs and ensure consistency across their network infrastructure.

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