The Research Of Traffic Engineering Over MPLS And IP Networks

Following further development of Internet, business flow which is newer and higher request appears one after another. Just because they appeared, existing network must satisfy more requests. Such as higher transmission efficiency, dynamic routing adjusts, network control ability with good flexibility and so on. Multi-protocol Label Switching (MPLS), because of its fast speed with more advantages, such as multi-service support, quality of service, has obtained the considerable development. In order to ensure the reliability of MPLS network, MPLS Fast Reroute (FRR) based on traffic engineering with the ability to provide fast protection and switching LSP capacity. FRR can switch the data traffic immediately to the backup path when a node or link fails in the main LSP, owing to the backup LSP or tunnels are pre-established, thus data loss is reduced with greatest degree.The research objective of the paper is to propose solutions to traffic engineering over MPLS and traditional IP. The aims are to maximize the utilization of network resources. First introduces MPLS traffic engineering and present situation of domestic and foreign FRR research. Then we put forward several optimal methods as follows:1. A new model (PBT) is proposed based on two kinds of standard FRR(Haskin and Makam) foundation. The proposed method attempts to establish bypass tunnels for each LSR and the LSR's NNHop LSR. When a link or a LSR is broken, the LSR that detects the failure chooses a bypass tunnel to reroute traffic for each affected LSPs.2. Another focus of the paper is aiming at the problem of manual selection of ABR cannot satisfy the dynamic change in the network load in OSPF, a new scheme is proposed for the dynamic appointment of ABR for OSPF(DAA-OSPF). Based on observed traffic demands and knowledge on link capacities, the proposed algorithm will locate an adequate ABR for the new traffic pattern to avoid incipient link congestion and accompanying performance degradation.At last, NS2 simulation results prove that the PBT method performs better than Haskin and Makam in terms of packet loss, correctly receiving ratio and successfully rerouting ratio, and DAA-OSPF algorithm gets a better performance at parameters such as end-to-end delay and packet loss rate.