基于SDN多控制器的协同系统研究和设计

发布时间：2018-10-19 15:10

【摘要】：随着互联网的普及,人们对网络质量要求越来越高。传统的网络已经不能满足人们对网络智能化的需求。SDN的产生,解耦了控制和转发,提升了人为控制网络的权限,并为业务的灵活部署和网络元件的远程控制提供可能。但SDN网络商用率低,多数成果仅处在实验室研究阶段。面向用户的应用层设计较少,而未来SDN商用需要的是更灵活的控制功能,SDN协同系统面向用户,因此基于SDN多控制器的协同系统研究是非常必要的。本文对SDN协同系统进行了基于OpenDaylight北向接口(REST API)的框架结构设计,实现了 SDN协同系统全局拓扑的显示。根据SDN架构的优势,对应用层的流量工程加以研究,以节能优化为目标,提出节能算法,以此来实现流量全网综合优化的目的。主要取得了以下成果:(1)设计了 SDN协同系统框架。使用Mininet自定义网络拓扑实现了底层拓扑结构与双控制器的对接,JavaScript调用SDN控制器北向REST API接口,对返回JSON数据进行处理和绘制拓扑结构,其中包括去重,布局等问题,实现了 SDN协同系统全局拓扑显示的功能。(2)利用SDN网络的拥有全局拓扑的特殊优势,提出一种新的基于SDN应用层的流量优化算法。以节能为主要思想,使用Matlab平台对算法进行仿真,关闭业务流少的分支和节点。在此算法的结果当中,可以看到,此算法能查找无业务和少业务的节点和链路,方便关闭节点和链路,实现SDN网络的流量优化的目标。
[Abstract]:With the popularity of the Internet, people have higher and higher requirements for the quality of the network. The generation of SDN decoupled control and forwarding, enhanced the authority of artificial control network, and provided the possibility for flexible deployment of services and remote control of network components. However, the commercial rate of SDN network is low, and most of the achievements are only in the stage of laboratory research. The design of user-oriented application layer is less, but in the future SDN business needs more flexible control function, SDN collaborative system is user-oriented, so it is very necessary to study cooperative system based on SDN multi-controller. In this paper, the frame structure of SDN collaborative system based on OpenDaylight northward interface (REST API) is designed, and the global topology of SDN collaborative system is displayed. According to the advantages of SDN architecture, the flow engineering of application layer is studied, and the energy-saving algorithm is proposed to realize the comprehensive optimization of traffic network. The main achievements are as follows: (1) the framework of SDN collaborative system is designed. Mininet custom network topology is used to realize the connection between the underlying topology and the dual controllers. JavaScript calls the SDN controller north to the REST API interface to process and draw the JSON data, including reduplication, layout, and so on. The function of global topology display of SDN cooperative system is realized. (2) A new traffic optimization algorithm based on SDN application layer is proposed by taking advantage of the special advantage of global topology of SDN network. Based on the idea of energy saving, the algorithm is simulated on Matlab platform, and the branches and nodes with less traffic are closed. Among the results of this algorithm, we can see that the algorithm can find nodes and links with no traffic and less traffic, and can close the nodes and links conveniently, and realize the goal of traffic optimization in SDN networks.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.02

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