Research On IPv6 Multicast Mechanism In SDN

In recent years,with the rapid development of the Internet and the wide application of real-time services such as live video and network teaching,multiple receivers need to receive the same streaming media data from one or more source nodes at the same time,and the capacity of information transmitted over the network is greatly increased.,Take up a lot of network bandwidth.For these application requirements,traditional on-demand technologies not only consume a large amount of source node resources and network bandwidth,but also limit the number of users.In contrast,multicast is a good transmission scheme.Because routers in traditional networks need to be pre-configured before multicast subscribers can dynamically join,leave,and generate multicast trees,routers in traditional networks do not dynamically select transmission paths for users with large bandwidth requirements.It is easy to cause link congestion,unable to provide users with better service quality,and difficult to deploy on a large scale in traditional networks.Research on the software-defined network framework centered on OpenFlow technology.SDN has the function of centralized control.It can perceive changes in the network topology,has natural advantages in fine-grained path selection,access control,and load balancing,and provides a good solution for the implementation of IPv6 multicast functions.In order to solve the problem of IPv6 multicast in the SDN network,a method of designing group member management,maintenance of bandwidth topology,and construction of a multicast tree in an SDN controller is proposed,and it is no longer necessary to deploy a distributed multicast routing protocol.The SDN controller implements three modules: bandwidth topology maintenance,group membership management,and multicast routing.The bandwidth topology maintenance module needs to maintain the underlying network topology and real-time bandwidth information;the group member management module identifies and schedules the message types of multicast subscribers and maintains the multicast subscriber information by analyzing the dynamic join and leave behaviors of multicast subscribers.The subscriber is directly connected to the switch information;the multicast routing module relies on the bandwidth topology maintenance module and the group member management module,selects the Dijkstra algorithm to build and maintain the multicast forwarding path according to the real-time bandwidth,and uses the characteristics of the switch to support multi-port forwarding to implement the group.Broadcast traffic is forwarded at the branching node.In order to verify the feasibility and effectiveness of the proposed IPv6 multicast scheme,firstly,the scheme was designed and implemented based on the ONOS controller,and then the environment was simulated using the Mininet network simulation platform.The experimental results show that the proposed SDN network IPv6 multicast solution can dynamically manage the joining and leaving of multicast subscribers;it can send a multicast traffic to multiple receivers and achieve multi-port forwarding of multicast traffic.Features.