A Strategy of CDN Traffic Optimization Based on the Technology of SDN

Modern Content Delivery Network(CDN)[1,2] by caching and scheduling strategy to reduce user-perceived latency, because CDN can schedule user to the CDN cache node which closest to. At the same time, this strategy can reduce the data flow which has to be sent back to the source station, and decrease the calculation pressure of source station. For some content which is dynamic and cannot be cached, the current acceleration approach is to create a GRE tunnel between the CDN nodes, using the static route scheduling dynamic data flow, improve the speed of data flow which back to the source station. It has been a recent trend of CDN to separate the control flow and data flow through technical, in order to change traditional dynamic/static content acceleration model, to optimize the CDN traffic. The core idea of Software Defined Network(SDN)[3,4] is through the network control plane and data plane separation equipment, so as to realize the flexible control of network traffic. SDN technology is used to transform the CDN, Make the CDN have an intelligent traffic scheduling environment which can focus on monitoring network and scheduling flow path real-time According to the different business. Ultimate aim is to avoid local congestion, optimize the CDN traffic, and improve the quality of the CDN service effect.