cmAccPortPcpDEEncDropEligiblePrio is a read-write PCP (VLAN priority) value that carries a given priority with an implicit drop-eligible indication encoded into it, for frames entering this access port. An administrator sets this so excess or best-effort traffic from a customer is marked with a PCP value that tells downstream nodes it is safe to discard first under congestion. For example, traffic exceeding a customer's committed rate would be encoded with this drop-eligible PCP value so it is the first to be dropped if the network-side link becomes congested.