A Reactive Scheme for Traffic Engineering in MPLS Networks

In this paper we develop a new Traffic Engineering scheme for congestion control in MPLS networks based on a reactive mechanism. While most existing TE schemes to prevent network congestion rely on constraint-based routing (CBR), the proposed algorithm uses a local search technique where the basic move is the modification of the route for a single Label Switched Path (LSP). Two versions of the algorithm are proposed: in the first one, called FID, an already established LSP is rerouted when a certain level of network congestion is detected, while in the second, called LFID, it is rerouted when a new LSP request cannot be satisfied. Experiments under a dynamic traffic scenario show a reduced rejection probability especially with long-lived and bandwidth consuming connection requests, thus proving a better network resource utilization compared to existing CBR schemes in MPLS networks.