This is a count of the good multicast packets received by this port. A good multicast packet is a normally sized packet (64 to maxsize bytes) that is received without error, a good CRC, no PHY or FIFO errors. Multicast packets are identified by having a 1 in the least significant bit of the first byte of the destination address (i.e. the first bit received is a 1). Broadcast packets are not included in this count.