基于SDN的QoS测量与路由规划系统设计与实现

摘要 采用OpenFlow技术，设计并实现了一套基于软件定义网络的QoS测量与路由规划系统.利用控制器与OpenFlow交换机之间的消息交互，实现SDN中链路时延、负载和丢包率的测量功能.针对QoS路由中存在的“多指标约束限制”问题，根据本文考虑的QoS指标(链路时延、负载和丢包率)，改进并实现了一种自适应多指标限制路由算法.实验结果表明:该系统在准确测量链路QoS指标的同时，可以根据测量结果切换符合条件的路由路径，满足系统设计需求.
Abstract：The QoS-enabled measuring and routing system is designed and realized by adopting the OpenFlow. The abilities of measuring link delay， load and packet loss are realized by utilizing the interactive messages between the controller and the OpenFlow-enabled switch. In order to solve the problem of multiple constraints during QoS routing， a multiple constraints routing algorithm is improved and realized with the QoS metrics (link delay， load and packet loss) considered. The experimental results show that the system proposed is able to measure the QoS metric and change the routing path based on QoS measurement， and it meets the needs of system design.