软件定义网络控制器南向接口开销控制方法研究

Software Defined Networking (SDN) decouples the control plane from the switch in the data plane, which forms the SDN controller. This paradigm introduces many benefits, e.g., openness, management simplicity, etc. Nevertheless, the separation of the SDN switch and the controller also leads to great communication overhead between them due to controlling the network(the number of the control message), and the overhead becomes the major bottleneck of SDN. This proposal investigates the south-bound interface overhead between the controller and the switch, searches for the causes of the huge communication overhead as well as its solutions，proposes new architectures, mechanisms and methods to obtain both high openness and low overhead. Through the theoretical model abstraction, software simulation, and testbed, this proposal tries to breakthrough and innovate from the following three aspects: 1) leveraging local stable information to rethink the decoupling of functionality; 2) mitigating the overhead at the controller side based on the flow volume characteristics; and 3) optimizing the overhead for switch utilizing the stochastic features of the flow table distribution. The potential outcome of this proposal will provide solid support and technical guarantee for the scalability and further development of SDN. This proposal is expected to produce more than 15 papers (CCF A/B/C list), 2-4 patents, and a system (with proprietary intellectual property rights).

软件定义网络（SDN）将控制平面从数据平面的交换机中完全分离出来形成物理上独立的控制器进行全局网络控制，带来了开放性、网络易管理等优点。SDN交换机和控制器的分离也造成两者之间需进行大量交互以实现对网络的控制，该问题成为制约SDN发展的瓶颈。本课题研究SDN控制器南向接口开销问题，寻找导致繁重交互开销的诱因和解决方法，探索既保留SDN开放性又降低控制器南向接口交互开销的体系结构、机制和方法，通过理论模型抽象、软件仿真和实验床搭建等方法，力图从三个方面寻求对现有技术的突破和创新：1) 利用局部稳定消息对SDN功能进行重新解耦；2) 利用流量统计特征减小控制器侧的交互开销；3）利用交换机流表分布优化SDN交换机侧的交互开销。课题研究成果可为SDN的可扩展性和进一步发展提供有力的理论支撑与技术保证。项目预期成果将产生CCF A/B/C推荐列表论文15篇以上，发明专利2-4项。

软件定义网络（SDN）将控制平面从数据平面的交换机中完全分离出来形成物理上独立的控制器进行全局网络控制，带来了开放性、网络易管理等优点。SDN交换机和控制器的分离也造成两者之间需进行大量交互以实现对网络的控制，该问题成为制约SDN发展的瓶颈。本课题研究SDN控制器南向接口开销问题，寻找导致繁重交互开销的诱因和解决方法，探索既保留SDN 开放性又降低控制器南向接口交互开销的体系结构、机制和方法，通过理论模型抽象、软件仿真和实验床搭建等方法，从三个方面对现有技术进行突破和创新：1) 利用局部稳定消息对SDN功能进行重新解耦；2) 利用流量统计特征减小控制器侧的交互开销；3）利用交换机流表分布优化SDN交换机侧的交互开销。课题研究成果可为SDN的可扩展性和进一步发展提供有力的理论支撑与技术保证。项目共发表高水平论文18篇，其中CCF A类论文3篇，B类论文7篇。申请国家发明专利2项，其中授权两项。