netsh>server \\servername or Ip
netsh>scope "IP address"
This command below reserves the IP address 192.168.1.78 for use by the client that identifies its MAC address 00c0ee93b614, the reservation name is printer, and supported type is DHCP and BOOTP (BOTH).
netsh>add reservedip 192.168.1.78 00c0ee93b614 printer BOTH
Very easy ;-)