Configure VTP Pruning on the Switches
VTP pruning allows a VTP server to suppress IP broadcast traffic for particular VLANs to switches that do not have any ports in that VLAN. By default, all unknown unicasts and broadcasts in a VLAN are flooded over the whole VLAN. All switches in the network receive all broadcasts, even in situations in which few users are linked in that VLAN. VTP pruning eliminates or prunes this unnecessary traffic. Pruning saves LAN bandwidth because broadcasts do not have to be sent to switches that do not required them.