ITU-T G.8031 PDF

This Recommendation defines the automatic protection switching APS protocol and linear protection switching mechanisms for point-to-point VLAN-based ETH SNC in Ethernet transport networks. All other protection schemes including point-to-multipoint and multipoint-to-multipoint are for further study.

Linear 1+1 and 1:1 protection switching architectures with unidirectional and bidirectional switching are defined in this edition of this Recommendation.

The APS protocol and protection switching operation for all other Ethernet network architectures (for example ring, mesh, etc.) are for further study.