This Recommendation defines the APS protocol and protection switching mechanisms for ETH
layer Ethernet ring topologies. The protection protocol defined in this Recommendation enables
protected point-to-point, point-to-multipoint and multipoint-to-multipoint connectivity within the
ring or interconnected rings, called “multi-ring/ladder network” topology.
The ETH layer ring maps to physical layer ring structure.
Protection schemes for the other layers, including ETY layer, are out of scope of this
Recommendation.
ITU-T G.8032-2008 history
2008ITU-T G.8032-2008 Ethernet ring protection switching Study Group 15