[maxi_funy]

включаем дебаги

1-1-1#debug ip dhcp server ?
class Class-based address allocation
events Report address assignments, lease expirations, etc.
linkage Show database linkage
packet Decode message receptions and transmissions
redundancy DHCP server redundancy events

1-1-1#debug dhcp detail

Дальше включаешь клиента и смотришь --


*Aug 14 12:48:37.127: DHCPD: Sending notification of DISCOVER:
*Aug 14 12:48:37.127: DHCPD: htype 1 chaddr 0013.4638.665e
*Aug 14 12:48:37.127: DHCPD: remote id 020a00000a00240101000001
*Aug 14 12:48:37.127: DHCPD: circuit id 00000000
*Aug 14 12:48:37.131: DHCPD: DHCPDISCOVER received from client 0100.1346.3866.5e on interface GigabitEthernet0/1.
*Aug 14 12:48:37.131: DHCPD: Seeing if there is an internally specified pool class:
*Aug 14 12:48:37.131: DHCPD: htype 1 chaddr 0013.4638.665e
*Aug 14 12:48:37.131: DHCPD: remote id 020a00000a00240101000001
*Aug 14 12:48:37.131: DHCPD: circuit id 00000000



вот как раз remote id 020a00000a00240101000001 по идее и есть твой ID


берёшь его и

020a.0000.0a00.2401.0100.0001 получаешь идентификатор