Patent ID: 8934335
Filing Date: 2015-01-13
Classification: H04L

Abstract:
1. A method comprising: initiating by an apparatus an enhanced loop-free alternate (LFA) procedure for a failed link of a network including a plurality of nodes, after at least one failed attempt to establish an LFA coverage using a standard LFA procedure and at least one failed attempt to establish the LFA coverage using a P-space and Q-space (P/Q) procedure; determining by the apparatus a state of incomplete loop-free alternate coverage for the nodes; determining by the apparatus a shortest path in the network exclusive of the nodes associated with the failed link; upon determining the shortest path, generating by the apparatus a path setting message to set interfaces of the nodes along the shortest path, wherein the path setting message is generated according to an explicit route object function of a multiple protocol label switching (MPLS) protocol; and setting by the apparatus each node along the determined shortest path as an explicit route object to create a bypass label switched path for the network, wherein there is no overlapping of P-Space and Q-Space for the nodes, and the enhanced loop-free alternate procedure includes a subsequent standard loop-free alternate procedure and a subsequent P-space and Q-space (P/Q) procedure.