cmAccPortPcpDEEncDropIneligiblePrio is a read-write PCP (VLAN priority) value that carries a given priority with an implicit drop-ineligible indication encoded into it, for frames entering this access port. An administrator sets this so downstream QoS logic can distinguish 'must not drop' traffic purely by inspecting the outgoing PCP bits rather than a separate drop-eligibility flag. For example, an operator protecting a customer's committed-rate traffic would configure this object so that traffic is encoded with a PCP value that downstream nodes recognize as drop-ineligible under congestion.