基于SDN的自适应流表调整算法

An adaptive flow table algorithm based on SDN

针对SDN网络结构中OpenFlow交换机内部流表资源有限的问题,提出一种基于SDN的OpenFlow交换机自适应流表调整算法。该算法通过在SDN控制器中添加功能模块获取流经交换机端口的数据流量,并根据流表中活动流表项的比重,动态调整对应流表项的生存时间和优先级,提高流表的匹配命中率,增加交换机的吞吐量,降低转发时延。实验结果表明,该算法能够提高OpenFlow软交换机的吞吐量,降低软交换机转发时延。

Aiming at the internal problem of limited resources flow in OpenFlow switch table of SDN network structure, the adaptive adjustment algorithm based on SDN OpenFlow switch is given. The algorithm gets the traffic flowing by adding a function module in the control. At the same time, it adjusts survival time and priority of the flow table dynamically by ob serving the proportion of the flow table entries so as to increase the throughput and reduce the transfer latency of the switch by adjusting the survival time and priority of the flow table. The experimental results show that the algorithm can effectively improve the throughput OpenFlow soft switch and reduce the forwarding delay of soft switch.