Patent ID: 8850014
Filing Date: 2014-09-30
Classification: H04L

Abstract:
1. A method of setting up a label switched path (LSP) for traffic between nodes of a network, the method having the steps of, at a given one of the nodes: receiving a request message requesting reservation of resources for a requested path of the LSP, the request message being sent from an ingress node of the requested path, via intermediate nodes along the requested path to an egress node, returning an acknowledgement message to an upstream node along the requested path, to acknowledge receipt of the request message, sending the request message on to a downstream node along the requested path, detecting an absence of an acknowledgement from the downstream node, the acknowledgement representing that the request message was received, or that a resend of the request message was received, determining whether the given node should react to the detected absence, and receiving a return message sent from the egress node if the request message reaches the egress node, to cause the nodes along the requested path to use the reserved resources to set up the LSP.