VTP Mode Client
VTP client mode doesn’t allow you to create any VLANs. all VLANs must be learned from a server switch. This prevents the switch from accidently propogating VLANs throughout the network. Another use is to prevent an older switch from wiping out a server’s VLAN database due to it having a higher revision number.
Switch(config)#vtp mode client
In the below example we will set SW1 to be a VTP client, then add a VLAN. Notice the switch rejected the command.
SW1(config)#vtp mode client