Configuring Automatic VLANs Across Multiple Cisco Switches

Automating VLAN Setup on Multiple Cisco Switches

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How to enable vlans automatically across multiple switches?



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A. B. C. D.


The correct answer is D. Configure VTP.

VLANs (Virtual Local Area Networks) are used to logically segment a switch into different broadcast domains. VLANs are often used to improve network performance, enhance security, and simplify network management.

To enable VLANs across multiple switches, the Cisco recommended approach is to use VTP (VLAN Trunking Protocol). VTP is a Cisco proprietary protocol that enables the automatic propagation of VLAN configuration information between Cisco switches that are connected by a trunk link.

When VTP is enabled on a Cisco switch, the switch will send VTP advertisements to all other switches that are connected to it via trunk links. These VTP advertisements will contain information about the VLANs configured on the sending switch, including the VLAN ID, VLAN name, and VLAN type.

Other switches that receive the VTP advertisements will compare the information to their own VLAN database. If the information is newer or has a higher revision number, the switch will update its own VLAN database with the new information.

To configure VTP on a Cisco switch, follow these steps:

  1. Set the VTP domain name using the command "vtp domain [domain-name]". All switches that participate in the same VTP domain must have the same domain name.

  2. Set the VTP mode using the command "vtp mode [client | server | transparent]". The server mode allows the switch to create, modify, and delete VLANs, and propagate this information to other switches in the same VTP domain. The client mode allows the switch to receive and use VLAN information from other switches in the same VTP domain but does not allow it to create, modify, or delete VLANs. The transparent mode allows the switch to pass VTP advertisements through it but does not participate in the VTP domain.

  3. Set the VTP password using the command "vtp password [password]". This is an optional step but is recommended to enhance security.

Once VTP is configured on a switch, it will automatically propagate VLAN information to other switches in the same VTP domain. This makes it easy to manage VLANs across multiple switches, especially in large and complex networks.