"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"