Patent ID: 8072879
Filing Date: 2011-12-06
Classification: H04J,H04L

Abstract:
1. A method for dynamically determining whether to reestablish a Fast Rerouted primary tunnel based on path quality feedback of a utilized backup tunnel in a computer network, the method comprising: establishing a primary tunnel from a head-end node to a destination; establishing a backup tunnel from a point of local repair (PLR) node along the primary tunnel around one or more protected network elements of the primary tunnel; determining path quality for the primary tunnel, prior to detecting failure of one of the protected network elements; sending notification of the primary tunnel's path quality to the head-end node; detecting failure of one of the protected network elements; in response, diverting traffic received on the primary tunnel at the PLR node onto the established backup tunnel; determining path quality for the established backup tunnel, after diverting traffic onto the backup tunnel; sending notification of the established backup tunnel's path quality from the PLR node to the head-end node; and determining, at the head-end node, whether to reestablish the primary tunnel in response to a difference in path quality between the path quality of the established backup tunnel and the path quality for the primary tunnel.