The Research On MPLS TE And QoS Guaranteed

Recently, the developmental speed of Internet is faster than that of ever. It becomes an integrated carrier piece by piece, which have multi business such as voice, video, data and multimedia etc. Internet adopts a popular TCP/IP protocol and the IP packet's transmitted platform can be any grouping-switching network. TCP/IP represents the trend of network-grouping, unconnected and global location. As we all know, IP will dominate the next telecom network. But as an unconnected system, the traditional IP network has many difficulties to carry out QoS. It faces some problems, which must be solved immediately. It can only provide the Best Effort business. Now the shortcomings of traditional IP network are emerged.Experts have proposed many advanced technologies according to the limitation of current IP network. MPLS is one of the best tools, which can guarantee QoS and has good future. It is a perfect combination between IP and ATM network. It can guarantee the consumer's different QoS because it absorbed the QoS mechanism of ATM , made good use of the fast switching capacity and mechanism of resource manage of ATM and reserved the agility, simpleness, easy extended of IP network. In current condition, MPLS not only increased data's forwarding speed and network's throughout greatly, it also provided Class of Service and QoS-guaranteed.The operation principle, kernel technology and working-mechanism are introduced firstly in this paper, then the working-mechanism of guaranteed QoS network is expatiated which is implemented by Traffic Engineering of MPLS. We also definite and analyze the QoS model and its parameters in IP network. A QoS routing selected algorithm based on improved Genetic Algorithm was proposed after studying many QoS-guaranteed algorithms. We also proposed that the network's resource expenditure and load-distributed are optimized as object function, which include QoS parameters such as bandwidth, hop counts, cost, delay etc. The target is to balance load, make good use of network resource, reduce congestion of network, and increase throughout with minimized network resource. Simulation results indicated that the algorithm, which solves Vector Object Program, is efficient and reasonable.Finally we summarize our work and then prospect the applied foreground and developmental trend of MPLS.