The Technology Of Quality Of Service In VPN Based On MPLS And Its Application

Along with the real-time service being applied increasingly on the IP network, higher quality of service is required for the IP network. To resolve the outstanding problems that exist in the traditional IP network and guarantee the quantity of service, we must research and apply the new technology to optimize and rebuild the architecture of the IP network in time. The new generation of networks adopting MPLS (Multiprotocol Label Switching) have the abilities of flexible routing, high speed switching, QoS guarantee mechanism and traffic control that make them meet the enterprise customers' requested QoS for their IP VPN(Virtual Private Network) applications. MPLS has become the first choice for network optimization and QoS guarantee.This thesis studied multiple technologies for QoS guarantee and their applications in the MPLS VPN network environment. The main research contents are as follows.This thesis analyzed the theory of MPLS technology deeply, and summarized the technical advantages of MPLS VPN in providing QoS guarantee. It analyzed the MPLS network structure, main components and core technologies in the network architecture. The work process of MPLS is also discussed. It analyzed the different layer 2 and layer 3 tunneling protocols of overlay VPN and discussed in detail the network architecture and technical principles for the integrated MPLS VPN. Based on the comparison between the MPLS VPN and traditional IP VPN, it made the conclusion that MPLS VPN has more advantages.The thesis studied the IP QoS service model defined by IETF, approached the work mechanism that provides the QoS guarantee by combining MPLS and the differentiated service model. Based on the analyzing and comparing the architecture between integrated service model and differentiated service model, the thesis studied and discussed the combination of MPLS and differentiated service model from the view of the MPLS QoS mechanism.The thesis studied the function of MPLS traffic engineering to guarantee the QoS. It reviewed the development of MPLS traffic engineering. It studied the implementation mechanism for MPLS traffic engineering and the work process for the functional components, and analyzed the feature of self-healing.The thesis combined the technical principle and the engineering experience from...