Patent ID: 9716639
Date: 2017-07-25
CPC Classifications: H04L

Claim:
1. A protection switching method for an infrastructure segment of a Traffic Engineered Service Instance (TESI) having one or more communication failures in a Provider Backbone Bridged Network (PBBN), wherein the one or more communication failures occurred on at least two tandem work infrastructure segments, the method comprising: identifying a network topology including at least one protection infrastructure segment for each tandem work infrastructure segment, such that the tandem work infrastructure segment and the corresponding protection infrastructure segment terminate on a same node, called a segment end node, wherein two protection infrastructure segments pass through at least one bridge node, called a co-joint node; monitoring for the one or more communication failures in the tandem work infrastructure segment and the protection infrastructure segment in the network topology; defining a Segment Protection Group (SPG) for each tandem work infrastructure segment including the tandem work infrastructure segment rooted at the co-joint node, wherein the SPG is formed by a set of tandem work infrastructure segments and protection infrastructure segments; switching the TESI over a high priority protection infrastructure segment; and provisioning two SPGs of the co-joint node to prevent the protection infrastructure segment from forwarding ambiguity and retracing of the TESI.