关键词：SDN软件；自动化；触发事件；逻辑控制器
摘 要：  In this paper we leverage the structure of the SDN software stack to automate the process of troubleshooting networks. We present two techniques for programmatically localizing the root cause of network problems.We evaluated our tools on three popular SDN platforms— Frenetic, Floodlight and POX—and found or reproduced three bugs: isolation breaches and faulty failover logic between replicated controllers.