Create DHCP reservations on Cisco devices using complex client-identifiers the easy way
Steps involved:
1) Identify which switch port and MAC address of the device to create a reservation for
2) Allow the device to be leased an IP from the DHCP pool
3) Identify the IP address using the MAC address table + ARP cache and look for the IP in question in the DHCP bindings
4) Identify the client identifier which is the entire string within the lease
5) Use this and the below script to create your DHCP pool
ip dhcp pool NAME-OF-POOL
host HOST-IP-ADDRESS SUBNET-MASK-OF-WIDER-POOL
client-identifier CLIENT-IDENTIFIER
default-router IP-ADDRESS-OF-DEFAULT-GATEWAY