Create & Configure VTP

New IOS CISCO 2950 Commands
SW1#configure terminal
SW1(config)#vtp mode server
SW1(config)#vtp domain duff-domain
SW1(config)#vtp password cisco
SW1(config)#vtp pruning
SW2#configure terminal
SW2(config)#vtp mode client
SW2(config)#vtp domain duff-domain
SW2(config)#vtp password cisco
SW2(config)#vtp pruning

Old CISCO 2900
SW3#vlan database
SW3(vlan)#vtp domain duff-domain
SW3(vlan)#vtp password cisco
SW3(vlan)#vtp v2-mode
SW3(vlan)#vtp pruning
SW3(vlan)#vtp client

Troubleshooting VTP
Confirmation Commands
#show vtp status
#show vlan
#show interfaces trunk
#show interfaces switchport
#show cdp neighbors
#show vtp password

if the configuration revision matches on all switches VTP is configured correctly if not most likely cause is miss spelled domain name or password as they are case sensitive