The number of packets received that contain a Message Type of 1 (BOOTREQUEST) in the first octet and do not contain option number 53 (DHCP Message Type) in the options.
Sources for this description
Belden, GarrettCom and Hirschmann IT official standalone MIBsHirschmann MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copies