Patent ID: 9686182
Date: 2017-06-20
CPC Classifications: H04L

Claim:
1. A method for providing a protected fast rerouting (“PFRR”) scheme, the method comprising: providing a communication network comprising: 1) a working path along which at least three nodes, being a first node, a second node and a third node, are located, 2) a first backup path along which at least three nodes, being said first node, a fourth node, and said third node, are located, and 3) a second backup path along which at least two nodes, being said fourth node and said second node are located, wherein said first backup path is configured to enable conveying said traffic in case of a failure occurring at said second node, and wherein said second backup path is configured to enable conveying said traffic in case of a failure at occurring along said first backup path at a link located downstream of said fourth node, upon detecting occurrence of a failure at said second node, diverting traffic that should have been conveyed along said working path to said second node, from the first node to said first backup path, said diversion is made based upon local link failure indications, towards the third node being the next-next-hop located along the working path, and upon detecting a concurrent failure at link located downstream of said fourth node, diverting traffic that should have been conveyed along said first backup path to said third node, from the fourth node to a second backup path towards said second node of the working path and wherein said diversion is made based upon local link failure indications, enabling conveyance of traffic towards its destination in case of at least two concurrent failures in the communication network.