Fixed IP assignmnet through DHCP: Clinet identifier vs Hardware address

[Boo]

Hello everyone,
I understand that the client-identifier is the mac address of the device (aa11.bb12.cc13) and the hardware-address is the hexadecimal value of client-identifier with a prefix of the LAN interface.

If the IP is allocated through the interface fa0/1, then it should be 01aa.11bb.12cc.13

The question is when to use client-identifier and when to use hardware-address?

What prompted me to ask this question?
I configured a reservation for a Kyocera printer FS-2100DN using hardware address (hardware-address 0017.c8xx.xxxx) it didn't work, so my boss changed it to (client-identifier 0100.17c8.xxxx.xx) and it worked like a champ.

Can someone please throw some light on this. Thanks.

[D_Lebedev]

Hi,

I've used this commands with al my cases.

ip dhcp-server XXX.XX.XX.XXX  ip address of DHCP server for POOL subnet

ip dhcp pool POOL
   host XXX.XX.XX.XX 255.255.255.0   ip address for exclusion
   client-identifier XXXX.XXXX.XXXX.XX  MAC address of client identifier.

[Boo]

Yeah I have also read somewhere that client-identifier XXXX.XXXX.XXXX.XX  will work. But some people are disagreeing to it as well. So I need to find it out for sure.