Summary

Recommendation ITU-T G.8131/Y.1382 provides architecture and mechanisms for subnetwork connection (SNC) protection switching for MPLS transport profile (MPLS-TP) networks. It describes the SNC protection architectures type, the uni- and bidirectional switching types and the revertive/non-revertive operation types. It defines an automatic protection coordination protocol used to coordinate both ends of the protected domain.

Amendment 1 provided the format of APC specific information, and descriptions about management (MI) signals and trail protection architecture.

Amendment 2 to Recommendation ITU-T G.8131/Y.1382 (2014) provided:

����������� Support for pseudowire (PW) protection.

����������� Modifications to the references of terms related to new Recommendation ITU-T G.808

Amendment 3 provides updates on the following:

����������� Initialization behaviour,

����������� State transition modification, and

����������� Operation related to state transition table lookup.