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Traffic Engineering and QoS Requirements Per PW/QoS class setup priority should be provided. In case the PSN tunnel lacks the resources necessary to accommodate the new PW a PW setup failure message MUST be returned and the PW MUST fail to setup. Alternatively: an attempt to signal an new PSN tunnel, or increase the capacity of the existing PSN tunnel MUST be made. Failure of such attempts MUST result in PW setup failure PW traffic parameter representations MUST be the same for all types of PW. The PW signaling MUST enable separate traffic parameter values to be specified for the forward and reverse directions of the PW. When setting up a MS-PW, S-PEs and U-PEs MUST be able to select a tunnel across the PSN that satisfies MS-PW QoS and bandwidth requirements PW admission control into a PSN tunnel MUST be configurable. S-PEs and U-PEs SHOULD be able to perform Admission control into a PSN tunnel to ensure that PW bandwidth and QoS requirements can be satisfied. |