Research Of MPLS Network Reliability And Solving Method

MPLS（Multiprotocol Label Switching）is a integration of IP and ATM technologywhich can supply traffic management and VPN operation. Any resources of network mightgo wrong. For providing networks with sufficiently high reliability, MPLS-based FaultRecovery mechanism with rapid restoration capacity is executed in Network. Recently, asmore and more real-time service applications of network appear, MPLS-based FaultRecovery has become a hot spot, and also technical basis of NGN.Fast ReRoute is the core technology (FRR) of MPLS-based Fault Reeovery.Multi-topology Routing (MTR) is a scheme that can be used to achieve fast path recoveryfrom transient failures in IP networks. This paper studies the Fast ReRoute technology andMulti-topology technology. After drawing the technical advantages of these twotechnologies and improving the technical defects, I put forward a new method of calculatingmain&backup label, so that the reliability of MPLS network can get upgraded. This paperproposed an optimization redundant tree algorithm based on two new concepts. First, I useoptimization redundant tree algorithm on the basis of the actual network topology. After that,the network topology is divided into2logic topology and these two logic topology containsall the nodes in the network. When a failure occurs in one topology LSR is in charge ofswitching transmission flow to another topology. This optimization scheme has less switchdelay and packet loss rate is low. Second, LDP FRR methods calculate the main outputinterface and backup output interface for each router, add backup label in the labelforwarding table. This paper proposed an optimization redundant tree algorithm based ontwo topology, so each LSR in the MPLS network maintain two label forwarding table intwo topology. When one topology occur failure, LSR immediately switch to another labelforwarding table. The nodes in the MPLS network have two next hop and assigned tag forthe corresponding destination prefix. After using the optimization scheme in all the nodesthere is no need to add new features to port protection, also this optimization scheme can do the node and path protection at the same time.