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对OpenFlow网络控制平面往返时延问题进行了分析,提出了一种时延评估方法.采用多到达单服务排队模型对控制平面的排队时延特征进行描述,分析了其主要构成,并计算出控制器处于不同网络规模和负载下的排队时延.实验结果表明:当网络中OpenFlow交换机数量增加和负载增大时,在不超过控制器处理能力的前提下,排队时延将逐渐增大,并在控制平面时延中占到很大比例.该模型能够计算出不同输入参数下的排队时延,并对控制器的时延特征进行有效评估.
The round-trip delay problem of OpenFlow network control plane is analyzed, and a delay evaluation method is proposed.Multi-reach single-service queuing model is used to describe the characteristics of queuing delay of control plane, the main components are analyzed, and the control The queuing delay of the network under different network sizes and loads shows that when the number of OpenFlow switches in the network increases and the load increases, the queuing delay will gradually increase under the premise of not exceeding the processing capacity of the controller Which accounts for a large proportion of control plane delay.The model can calculate the queuing delay under different input parameters and effectively evaluate the delay characteristics of the controller.