Please refer to explanation below:
Explanation
vtp server configuration:
switch#conf t
switch(config)#vtp mode server
switch(config)#vtp domain CISCO
switch(config)#vlan 20
switch(config)#vlan 31
switch(config)#int vlan 20
switch(if-config)#ip add 172.64.20.1 255.255.255.0
switch(if-config)#no shut
switch(if-config)#int vlan 31
switch(if-config)#ip add 192.162.31.1 255.255.255.0
switch(if-config)#no shut
switch(if-config)#exit
switch#ip routing
switch#copy run start
vtp client configuration:
switch#conf t
switch(config)#vtp mode client
switch(config)#vtp domain CISCO
switch#copy run start
Alternative #1
VTP DomainDistribution
VLAN Ids2031
IP Addresses172.16.16.1/24172.16.193.1/24
Alternative #12
VTP DomainDistribution
VLAN Ids3021
IP Addresses172.16.203.1/24172.16.93.1/24