软件定义联网的路由选择技术研究

发布时间：2018-05-25 02:09

本文选题：软件定义联网 + 流量信息采集　；参考：《南京邮电大学》2017年硕士论文

【摘要】：随着IP网络新兴业务的快速发展,人们对服务质量的要求越来越高,但现有的IP网络采用分布式路由控制机制,较难实现网络资源的动态分配。软件定义联网(SDN)作为一种新型的网络体系结构,实现了网络控制与数据转发的分离,其集中式的路由控制机制更容易为业务流选择具有服务质量(QoS)约束的路由,因此,研究SDN的路由选择技术具有重要的理论意义和应用价值。论文通过分析SDN的网络结构特点和OpenFlow协议特性,对比IP网络路由选择技术与SDN的路由选择技术的区别,总结出SDN的网络实现QoS路由选择技术的优势,并设计了基于SDN网络的具有QoS约束的路由选择方案;针对IP网络链路信息不准确及算法复杂度较高等问题,本文使用OpenFlow协议并采用主动的方式实时采集网络链路上的流量信息;此外,为了简化QoS路由算法的复杂度,本文设计和仿真实现了一种基于Dijkstra算法的具有QoS约束的路由选择算法,该算法根据全局网络拓扑及链路代价为业务流选择具有QoS约束的路由。论文在开源实验平台Floodlight控制器上对SDN网络链路上的已用带宽进行测试,测试结果表明可以较为准确地获取链路带宽状态;对SDN网络中具有QoS约束的路由算法的有效性进行了仿真实验,实验结果表明:QoS路由算法能根据业务流类型,为业务流提供具有QoS约束的路由。
[Abstract]:With the rapid development of new services in IP network, the requirement of QoS is becoming higher and higher. However, the existing IP network adopts distributed routing control mechanism, so it is difficult to realize the dynamic allocation of network resources. As a new network architecture, SDN (Software definition networking) realizes the separation of network control and data forwarding, and its centralized routing control mechanism is easier to select QoS constrained routing for traffic flow. The research of SDN routing technology has important theoretical significance and application value. By analyzing the characteristics of SDN network structure and OpenFlow protocol, comparing the differences between IP network routing technology and SDN routing technology, this paper summarizes the advantages of QoS routing technology in SDN network. A route selection scheme with QoS constraints based on SDN network is designed. Aiming at the problems of inaccurate link information and high algorithm complexity in IP network, this paper uses OpenFlow protocol and adopts active way to collect the traffic information on the network link in real time. In addition, in order to simplify the complexity of QoS routing algorithm, this paper designs and implements a routing algorithm with QoS constraints based on Dijkstra algorithm. The algorithm selects QoS constrained routing for traffic flows according to global network topology and link cost. In this paper, the used bandwidth on the SDN network link is tested on the open source experimental platform Floodlight controller. The test results show that the link bandwidth state can be obtained more accurately. The effectiveness of the routing algorithm with QoS constraints in SDN networks is simulated. The experimental results show that the SDN routing algorithm can provide routing with QoS constraints for traffic flows according to the type of traffic flow.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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