This Recommendation: Recommends performance objectives of packet-based networks accepted across a UNI for each defined packet network QoS class, addressing "end-to-end network" or bearer QoS. Recommends packet marking and handling mechanisms designed for indicating the accepted packet network QoS class for a given incoming IP packet on a UNI or NNI. Addresses procedures for the measurement of the QoS performance of packet-based networks, namely MPLS, Ethernet and IP.