基于时序与集合的SDN流表更新策略

流表更新是软件定义网络中不可忽视的问题.针对SDN(软件定义网络)流表更新一致性问题提出一种基于时序与集合的流表更新方案,将交换机根据新旧路径分类,分类集合按次序分别进行更新,首先将新流表更新完毕以保证传输,最后删除旧流表.仿真实验表明,在相同网络速率下,方案保证了流表更新的一致性,更新时间较短,控制负载较低,并减小了交换机流表空间的占用.

Update strategy of SDN flow table based on time series and sets

Flow table update is an issue that cannot be ignored in software-defined networks(SDN). Aiming at the problem of SDN flow table update consistency, a flow table update scheme based on timing and set is proposed. The classification of switches is separated by new and old paths, and the updating of the classification set is in accordance with a certain order. To ensure the transmission, the updating of the new flow table is realized before the deletion of the old one. Simulation experiments show that this scheme realized the consistency of the SDN flow table update under the same network speed. At the same time, this scheme showed the relatively short update time, the comparably low control load, and the reduction of the occupation space of switch flow table to ensure the better update effect.