TECHNIQUE FOR FAST REROUTE PROTECTION OF LOGICAL PATHS IN COMMUNICATION NETWORKS

摘要

Technique for fast rerouting (FRR) of traffic in a communication network, from a working path comprising a link with its downstream node, to one or more backup paths concurrently providing link protection and node protection to the link and the downstream node; the method comprises enabling the downstream node to block forwarding of traffic, if received at the downstream node along the backup path(s), towards a more-downstream node in the working path in case the more-downstream node participates in providing node protection against a failure of the downstream node, the technique thereby prevents traffic duplication at the more-downstream node and does not require distinguishing a link failure from a node failure.