Design And Implementation Of A Multicast System For Centralized Planning

With the progress of science and technology and the ever-changing scientific and technological innovation,the emergence of a large number of high bandwidth,low latency and other requirements of the application of QoS constraints problem.Network size continues to expand and the number of network nodes grows rapidly at the same time,the network communication link becomes increasingly congested.A kind of multicast communication mechanism that can support point-to-multipoint or multipoint-to-multipoint is a new choice to solve QoS constraints problem such as high bandwidth and low latency.Traditional multicast communication mechanism only to the data transmission to the data receiving needs of the multicast group members,any user who only need to know and join the multicast address can receive multicast data,which lack of malicious users for the security mechanism.Therefore,the study of multicast management for centralized planning,improve the security of multicast services and network resource utilization,has been a hot topic in computer network research.Firstly,this paper analyzes the development of multicast routing technology,gives the QoS constrained multicast routing model,proposes a constrained multicast algorithm for centralized planning.The algorithm uses the minimum tree algorithm and the dynamic programming algorithm to decompose the problem into several subproblems of SPT tree.The Dijkstra SPT algorithm is used to find the SPT tree in the reverse direction.Finally,the recursive method is used to find the optimal path to meet the delay requirements,and the same path is merged and replaced the path that does not meet the delay requirement to find the optimal solution.Secondly,a centralized control multicast system design is proposed,which proposes a multicast control system for centralized planning.The system adopts B / S(browser / server)mode,divided into task management,centralized planning and task maintenance of the three modules,which is achieves the basic management of multicast management.At the end of this paper,the system tests through the network simulation environment built by GNS3.The test results show that the system can not only realize the access authentication to multicast users,but also optimize the transmission path and range of multicast data.The experiment proved to achieve the desired effect.