Path protection method to support QoS of traffic flows between two routers in MPLS networks

摘要

The present invention relates to a path protection method for guaranteeing quality of service (QoS) for traffic flows between routers in a multi-protocol label exchange (MPLS) network, and a recording medium thereof. Given the QoS conditions for a set of traffic flows between Label Edge Routers, the network can be restored by quickly restoring the Limited Label Switch Path (CR-LSP) in the event of a network failure through pre-protection path establishment. In order to provide a path protection method and a recording medium for maximizing the resource utilization and service availability of the network, the path aggregation is established by the operation / protection paths satisfying the QoS conditions for the aggregation of traffic flow between a pair of LERs. step; After all resources belonging to the set of routes are assigned and reserved, the resources required by each traffic flow in the set of traffic flows are reserved to all the routes in the set so that all the routes belonging to the set of routes can be used as operational paths. Identifying a faulty path; And satisfying the QoS condition of the traffic flow set by transferring the reserved resource allocated to the paths changed from the normal state to the failed state to the normal path, and transmitting the traffic flow set so that the QoS condition is satisfied.