Ip Multicast-based Multi-protocol Label Switching Technology And Realization

Currently, IP multicast has been regarded as a popular technology to support point-to-point and many points to many point's applications. However, the classical IP multicast has many drawbacks which results in poor performance, such as the transmission reliability of multicast packets, the security of member management of multicast group, the ability to support heterogeneous networks, and etc. As a the most promising switching technology in data packet networks, MPLS (Multi-Protocol Label Switching) efficiently integrates the switching functions of 2nd layer with the routing functions of 3rd layer, which make IP networks having the connection-oriented character, and greatly improve the transmission performance for IP packets. Therefore, to enhance IP multicast by MPLS becomes one of most important research ideas in the field of IP multicast. However, originally MPLS is not designed for IP multicast, and so there are many difficulties to support IP multicast, which root in the mapping of 3rd layer multicast tree into 2nd layer Label Switching Path (LSP). As known, the label assignment and distribution is driven by the control message in the current version of Label Distribution Protocol (LDP). This will be effective to IP Unicast, not to IP multicast. Based on the current research results in the fields of IP multicast and MPLS, the thesis mainly studied the multicast-ware LSP establishment methods, i.e., Multicast-ware Label Distribution Protocol (M-LDP), which consists of the following three parts: 1) To discusses how improve the label assignment and distribution driven by control message, and put forward the label distribution mechanism based on label aggregation. 2) To study the MPLS multicast tree (m-LSP) dynamic maintain mechanism under the link failure and recovery. 3) To research the implementation detail of M-LDP in the environment of Linux from the reliability requirement and the maintain message communication ability. Then the thesis presents several experiments in the test-bed to analyze the performance of the implementation MPLS multicast in terms of throughout, the link failure and recovery detection time, and the notification time. Finally, the thesis studies an extending issue of IP multicast, i.e., QoS guarantee, and proposes an efficient QoS algorithm based on non-linear distance and load-balance, and provides computer simulation to evaluate the algorithm based on the test-bed.