The priority queueing for packets received on this port, except for BPDU/IGMP packets and packets with unknown unicast destination address. IGMP and BPDU packets are always routed with high priority; packets with unknown unicast destination addresses are always routed with low priority. Other packets follow the rules below: other(1) - this entry is currently in use but the conditions under which it will remain so are different from each of the following values. default(2) - A packet is normally classified as low priority ,unless at least one of the following is true: .The packet contained a TAG (per 802.1Q definition) with the priority greater or equal to 4. .The address-table entry for the destination address had Pd=HIGH. force-low_priority(3) - A packet is normally classified as low priority. force-high_priority(4) - A packet is normally classified as high priority.