http://www.rfc-editor.org/rfc/rfc8184.txt
RFC 8184: Dual-Homing Protection for MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires, W. Cheng, L. Wang, H. Li, S. Davari, J. Dong2017-06-01T23:00:00-00:00This document describes a framework and several scenarios for a pseudowire (PW) dual-homing local protection mechanism that avoids unnecessary switchovers and does not depend on whether a control plane is used. A Dual-Node Interconnection (DNI) PW is used to carry traffic between the dual-homing Provider Edge (PE) nodes when a failure occurs in one of the Attachment Circuits (AC) or PWs. This PW dual-homing local protection mechanism is complementary to existing PW protection mechanisms.