Study On Application Of SDN Based On IP Backbone Network

In recent years, with the rise of the Internet, especially the rapid development of mobile Internet in the last few years, various types of business data, including instant messaging, cloud computing, video broadcast and other data services get a tremendous growth in the flow. IP backbone carrier network as an important business data carrier network, its heavy load has become a great challenge. On one hand, Internet service providers continue to expand the backbone, to support a huge amount of data. On the other hand, as the traffic scheduling mechanism is not perfect, expansion to the underlying hardware can not completely solve the network congestion problems, but may cause inefficiencies in network link utilization.Traditional IP backbone network traffic scheduling mechanism has inherent limitations, such as no global flexibility of control, no fine grain of control and so on. SDN technology has brought some new ideas to solve the traffic scheduling problems. Google, for instance, introduced the SDN technology to solve data center WAN traffic scheduling problems, making its network link utilization exceed 95% which has inspired the academic on network traffic scheduling problems.The specific points of this paper are as follows:(1) With IP backbone network of ISP as a case study, qualitative analysis of the characteristics of IP backbone network, summed up the three characteristics, namely layer characteristics, routing characteristics, and flow characteristics. This paper points out the IP backbone network topology is a twolevel structure, which can be distinguished as the core layer and convergence layer. Based on their different topological properties correspond to different routing features. Traffic with same source and destination subnets can be aggregated into aggregation flow as a traffic control unit.(2) Based on two different ideas, this paper has put forward two sets of traffic scheduling algorithms to solve link congestion problems in IP backbone network. These two approaches are based on non-hierarchical topology idea and base on backbone network topology idea. Based on non-hierarchical topology idea is not sensitive to congestion link in topology, routing business flows in congestion link by means of routing aggregate flows. Base on backbone network topology idea deals congested links is different topology layers with different scheduling strategies, and relatively independent of the dealing with different levels of congestion.(3) Design of SDN traffic scheduling platform for IP backbone network, including SDN platform framework design, SDN traffic scheduling application architecture design, Openflow multi-table design, and traffic scheduling workflow design.