Importance

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Abstract

The invention concerns a method of protecting a label switching path in an MPLS network comprising a plurality of nodes connected by IP links, the said path commencing with an ingress node and ending in an egress node of the said network, passing through a given series of nodes and links in the said network, referred to as elements of the said path. When the said ingress node requires the protection of an element of the path, in a first phase a node on the said path, referred to as the PLR point, upstream of the said element to be protected, determines a back-up path, referred to as the bypass tunnel, joining the path upstream of the said element to be protected at a node, referred to as the PM point, and, in a second phase, network resources are reserved on each of the links of the bypass tunnel in order to back up the said path in the event of failure of the said element.

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First Claim