为了解决IP网络对业务流进行QoS路由选择时存在链路状态信息收集困难及算法复杂度较高等问题,利用SDN网络控制器对网络集中控制的优势,通过OpenFlow协议获取基础设施层的链路状态信息及SDN控制器提供集中式的QoS路由服务,为业务流选择具有QoS约束的路由.涉及到的QoS度量参数为带宽,QoS路由选择方案基于SDN网络设计链路上已用带宽的收集方法,为QoS路由算法提供准确的链路状态信息,并将业务流提出的带宽约束要求转换成链路代价.QoS路由方案根据链路代价使用基于Dijkstra算法的QoS路由算法为业务流选择满足带宽约束的QoS路由.在基于Floodlight控制器以及Mininet网络仿真工具搭建的实验平台上进行了验证,结果证明了该QoS路由方案的可行性.%In order to solve the problem that the link state information is difficult to collect and the complexity of the algorithm is high when the IP network selects a QoS routing for the service flow,we take advantage of the centralized control of the network by using SDN control-ler and obtain the link state information of the infrastructure layer through the OpenFlow protocol,and provide the centralized QoS routing service to select the route with QoS constraints for the service flow.The QoS metric parameters are bandwidth.QoS routing scheme design the method of collecting bandwidth on the link to provide accurate link state information for QoS routing algorithm.Then,the bandwidth constraint requirements proposed by the service flow are converted into link cost.The QoS routing scheme uses the QoS routing algorithm based on the Dijkstra algorithm to select the QoS route satisfying the bandwidth constraint according to the link cost.The feasibility of QoS routing scheme is verified by the experimental platform based on the Floodlight controller and Mininet network simulation tool.
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