Research And Design On MPLS Fast Reroute

Any resources of network might go wrong. For providing networks with sufficiently high reliability, MPLS-based Fault Recovery mechanism with rapid restoration capacity is executed in Network. Recently, as more and more real-time service applications of network, MPLS-based Fault Recovery has became a hot spot, and also technical basis of NGN. This paper proposed a optimization Fast Reroute scheme based on optimized backup resources information sharing mechanism and bandwidth-constrained routing by studying of FRR, the core technology of MPLS-based Fault Recovery. The main research contents and works of this paper include the following two aspects:(1)Research on Fast Reroute of MPLS-based Fault Recovery, focus on the classical Fast Reroute schemes. Recently, the most famous FRR schemes include Makanu Haskin and RSVP, other schemes are all on the basis of those famous schemes. Makam and Haskin have a common drawback, that is a lot of problems appear when Point of Switch is far away form the place faults occur. Makam scheme has a great of packets lost, while Haskin scheme has very high delay and leads packets disorder. Meanwhile, those three famous schemes have a drawback in common, that is idle backup path cause large amount of waste in bandwidth resources.(2)Proposed a optimization Fast Reroute scheme. Inheriting better rapid restoration ability of classical schemes and effectively improving the utilization of network resources. After study and analysis of classical schemes, aiming at the problem of waste in backup bandwidth resources in common, proposed a optimization Fast Reroute scheme called OFRR, it contains two other aspects, one is optimized backup resources information sharing mechanism, it achieves efficient sharing of backup resources information by making key nodes of backup path know the available information of links and routes in that rage. This solution allows bandwidth global sharing. The other side is optimized backup path selecting algorithm based on the classical SPF algorithm, it selects the link with more backup bandwidth resources as priority by adding limitation of bandwidth to the link weight. Farther achieving reduction of network reservation bandwidth resources.(3)Demonstration and implementation of optimization scheme simulation experiment. Build the OPNET network simulation platforms, includes construction of network simulation model, setting of simulation parameter, configuration and run of simulation. Simulate Makam,Haskin,RSVP,OFRR those schemes in packet lass rate, switching time of traffic stream and utilization of network resources by comparing method. Simulation results show that OFRR can reduce packet loss rate and switching time of traffic stream compared with Makam and Haskin scheme. Comparing with RSVP scheme, OFRR has less backup resources consumption, effectively improves the utilization of network resources.