ITU-T Recommendation Y.1720
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ITU-T Recommendation Y.1720 provides requirements and mechanisms for 1+1, 1:1, shared mesh, and packet 1+1 protection switching functionality for the user-plane in MPLS networks.
The mechanism defined herein is designed to support end-to-end point-to-point LSPs. Protection switching functionality for multipoint-to-point and point-to-multipoint LSP are for further study. m:n protection switching is for further study. Hitless protection switching is outside the scope of this version of the recommendation.
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