Summary

This Recommendation provides mechanisms for user-plane OAM (Operation and Maintenance) functionalityin MPLS networks according to the requirements and principles given in ITU-T Rec. Y.1710. This Recommendation is designed primarily to support point-to-point and multipoint-to-point explicit routed LSPs (ER-LSPs) with limited applicability to LSPs that employ penultimate hop popping (PHP).

The OAM mechanisms defined in this Recommendation assume common forwarding of the LSP payload and Y.1711 PDUs. In some situations this may not be true, such as when the LSP payload is load balanced across a plurality of parallel paths while still appearing as a single trail to the ingress and egress. LSRs introducing variations in connectivity are responsible for ensuring that the availability behaviour of Y.1711 per ingress-egress pair is preserved.