Patent ID: 9565054
Date: 2017-02-07
CPC Classifications: H04L

Claim:
1. A protection switching method for an infrastructure segment between a source node, at least one intermediate node and a destination node of a communication network, wherein the infrastructure segment is co-routed with at least one work or protect infrastructure segment of a Segment Protection Group (SPG), the method comprising: monitoring the infrastructure segments; detecting a fault at the infrastructure segment; provisioning protection group between the source node and the destination node as outer work and outer protect (Outer Protection Group, OPG), and between at least two intermediate nodes as inner work and inner protect (Inner Protection Group IPG); and provisioning at least one supplementary outer protect on the same port of the OPG nodes where the OPG is provisioned, such that the outer supplementary protect diverge in such a way that mirrors the behavior (fate sharing) of the inner work and inner protect, invalidating the segments in an inner SPG triggers an outer SPG to stop fate sharing for those invalid segments.