cmNetPortPrioMapInPriority is a read-write integer (0-7) that serves as the index into the priority-to-CoS mapping table for a network-facing port, representing one of the eight possible 802.1p priority values a frame can carry. An administrator uses this index to select which incoming priority value's CoS mapping (cmNetPortPrioMapCOS) is being configured for that port. For example, to define how priority-5 traffic on this network port should be policed, an administrator would address the table row where this object equals 5.