Configure VTP Pruning on the Switches
VTP pruning permits 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 wholeVLAN. All switches in the network receive all broadcasts, even in situations in which few users are connected in that VLAN. VTP pruning is used to eliminate or prune this unnecessary traffic.
Pruning saves LAN bandwidth because broadcasts do not have to be sent to switches that do not need them.
Pruning is configured on the server switch with the vtp pruning command in global configuration mode. The configuration is pushed to client switches. Confirm VTP pruning configuration on each switch using the show vtp status command. VTP pruning mode should be enabled on each switch.
S1#show vtp status
VTP Version : 2
Configuration Revision : 17
Maximum VLANs supported locally : 255
Number of existing VLANs : 9
VTP Operating Mode : Server
VTP Domain Name : Lab4
VTP Pruning Mode : Enabled