Appendix C Switch Port Functionality

VLAN Trunk Protocol (VTP)

VLAN Trunk Protocol (VTP)

VLAN Trunk Protocol (VTP) is a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs within a VTP domain. A VTP domain (also called a VLAN management domain) is made up of one or more switches that share the same VTP domain name and that are interconnected with trunks. VTP minimizes configuration errors and configuration inconsistencies that can result in a number of problems, such as duplicate VLAN names, incorrect VLAN-type specifications, and security violations.

The FESMIC supports both VTP version 1 and version 2.

VTP server mode—You can create, modify, or delete VLANs and specify other configuration parameters (such as VTP version and VTP pruning) for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches, based on advertisements received over trunk links. VTP server is the default mode.

VTP clients mode— Behaves the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client.

VTP transparent mode—Switches do not participate in VTP. A VTP-transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out their trunk interfaces.

VTP Server Example

The following example shows how to configure the switch as a VTP server:

Router# vlan database

Router(vlan)# vtp server

Setting device to VTP SERVER mode.

Router(vlan)# vtp domain Lab_Network

Setting VTP domain name to Lab_Network

Router(vlan)# vtp password WATER

Setting device VLAN database password to WATER.

Router(vlan)# exit

APPLY completed.

Exiting....

Router#

VTP Client Example

The following example shows how to configure the switch as a VTP client:

Router# vlan database

Router(vlan)# vtp client

Setting device to VTP CLIENT mode.

Router(vlan)# exit

In CLIENT state, no apply attempted.

Exiting....

Router#

Cisco 3200 Series Router Hardware Reference

 

C-6

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Cisco Systems 3200 manual Vlan Trunk Protocol VTP, VTP Server Example, VTP Client Example

3200 specifications

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