Modify Dynamic Host Configuration Protocol (DHCP) mode to forward BootP messages only, DHCP messages only, or both.
default ip dhcp-relay fwd-path {A.B.C.D} mode
ip dhcp-relay fwd-path {A.B.C.D} mode bootp
ip dhcp-relay fwd-path {A.B.C.D} mode bootp_dhcp
ip dhcp-relay fwd-path {A.B.C.D} mode dhcp
The default mode is both.
GigabitEthernet Interface Configuration