SW1#vtp primary vlan
This system is becoming primary server for feature vlan
No conflicting VTP3 devices found.
Do you want to continue? [confirm]
SW1#
SW1#show vtp status
VTP Version                   : 3 (capable)
VTP version running           : 3
VTP Domain Name               : admin
VTP Pruning Mode              : Disabled
VTP Traps Generation          : Disabled
Device ID                     : aabb.cc00.0400
Feature VLAN:
--------------
VTP Operating Mode                : Primary Server
Number of existing VLANs          : 23
Number of existing extended VLANs : 2
Configuration Revision            : 2
<--Output Omitted-->