This read-write VlanPriority is the input priority value used, on ingress from the network port, as the basis for decoding a frame's true priority and drop eligibility from its Exp marking. An administrator configures this mapping so that incoming MPLS-tagged traffic is correctly reclassified back into the device's internal priority scheme. For example, this object lets the port correctly interpret an arriving Exp value as originating from priority-3 traffic before internal queuing decisions are made.