Research For Traffic Engineering With MPLS Network

1.Backgroud of the researchAlong with the development of the Internet and the increasing demand of the network transmission speed and the grade of service, the existing network architecture are unable to meet the demand of higher velocity and better grade of service. MPLS is produced under such situation, it can provide faster route service and better QoS, also use the network resources effectively.A pure IP network based on MPLS can implement traffic engineering, gaining benefit through providing different service and controllable network.2.The principle of MPLS technologyMPLS is a special kind of transmittal technique. It assigns the ip data package who enters network label and achieves ip data package transmittal by exchanging label. The tag exits by the substitute of the head of ip package in the network. MPLS finished transmittal by exchanging label which channel the ip package passes within the network. When the ip package leaves the network, the ip package is undone and reaches the destination through the router measure of ip package.MPLS network contains some basic elements. The node on the edge of network is called Label Edge Router and the node in the center of the network is called L Label Switching Router. LER provide the function of high-speed exchange. The path among the MPLS nodes is called Label Switched Path. One LSP can be looked as a one-way channel through the network.MPLS retransmits labels based on the fixed length. The label carries on the exchange in the control plane; it is similar with carrying on the route exchange of information way which retransmits before the IP grouping. Label exchange is carried out through label distribution, for example TDP, LDP, RSVP or BGP.