基于分类和时序的SDN流表更新一致性方案

软件定义网络（Software Defined Networking, SDN）实现了网络的集中控制和网络资源的灵活调度，已成为下一代网络的热点。确保SDN网络流表更新的一致性，对保障网络配置更新过程的正确性，和SDN网络的有效、安全运行，具有重要的意义。本文针对SDN网络配置更新所引起的数据包处理不一致问题，提出一种基于分类和时序的SDN流表更新一致性方案。通过设计交换机分类方案及优化更新顺序，实现了SDN流表更新的一致性和新、旧路径的数据并行传输，在保证方案良好通用性和隔离性的基础上，有效控制了更新时间和交换机存储空间的占用率，并降低了控制器的上传负载。

A Classification and Sequence Based Consistent Flow Update Scheme in SDN

SDN(Software Defined Networking), which has achieved a centralized control of the network and a flexible management of the network resources, is increasingly becoming the popular topic of the future network field. Ensuring the consistency of the SDN network flow table update is of vital importance to ensure the correctness of the network configuration update process and to achieve the effective and safe operation of the SDN network. In this paper, we proposed a consistenct flow table update scheme based on classification and sequence to solve the problem of packet processing inconsistency caused by SDN network configuration update. By designing the switch classification rule and optimizing the update order, this scheme realizes the consistency of the SDN flow table update and the parallel transmission of the new and old routes. On the basis of ensuring the generality and isolation, this scheme controls the update time and the storage space of the switch effectively, and decreases the upload of the controller.