Verifying the VTP configuration

Use the show vtp status command to verify the VTP configuration.

When initially configuring switches in a VTP domain, pay close attention to the configuration revision number. Check to see that it increments only when changes are made at intended VTP servers.

In the example above, "Configuration last modified by 0.0.0.0" specifies the IP address of the switch that updated the VLAN database of this switch.

NOTE:

In this example, VTP version 2 is available (as shown by the "VTP Version" line of the output), but not enabled (as shown by the "VTP V2 Mode" line of the output).

VTP Counters
Use the show vtp counters command to display statistics about VTP operation.

Output from this command verifies if VTP updates are being sent and being received by the switch and the number of updates that have been seen.

Common Problems with VTP Configuration
The following unexpected results can occur after VTP configuration:

This topic identifies the state of the VTP configuration using the output to the show vtp status command.

Use the show vtp status command to verify the VTP configuration.

Lab Activity

Lab Exercise 1: Catalyst 2950T and 3550 Series VTP Domain and VLAN Trunking

Configure a VLAN trunk between two Cisco Catalyst WS-C2950T-24-EI switches and a Cisco Catalyst WS-C3550-24-EMI switch in the command-line interface (CLI) mode.

Lab Activity

Lab Exercise 2: Catalyst 2950T and 3550 Series VTP Pruning

Configure VTP pruning between two Cisco Catalyst WS-C2950T-24-EI switches and a Cisco Catalyst WS-C3550-24-EMI switch using the command-line interface (CLI) mode.