SDN中基于负载均衡的流表下发方法

Flow table update method based on load balancing for SDN

通过比对单个域内控制信道与数据信道比例,将所须安装流表项数据以源路由下发和直接下发两种方式动态混合处理,以此来减小控制器负载以及动态调节控制平面和数据平面负载均衡度,同时减小流表下发和端到端传输的时延以及控制逻辑出现不一致的概率.仿真显示:所提方法在控制器负载消耗量、流表安装时延和数据包平均传输时延等方面优于传统的流表直接下发方法以及基于源路由的流表下发方法.

By comparing the load of the control plane and data plane in each domain,flow table entry was dynamically installed based on a combination of source routing and direct installation.The controller′s load could be reduced and the load balance of control plane and data plane could be dynamically adjusted.Meanwhile,the flow entry installation delay,end-to-end transmission delay and the probability of the inconsistency of control logic could be reduced.Extensive simulation results demonstrate that the proposed method outperforms the traditional methods in the metrics of controller load consumption,flow table update delay and average packet transmission delay.