Dual-Homing Protection for MPLS and the MPLS Transport Profile (MPLS-TP) Pseudowires
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This 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.