基于SDN的混合网络链路资源调度系统的设计与实现

发布时间：2018-04-28 15:10

本文选题：软件定义网络 + 过渡机制　；参考：《北京邮电大学》2017年硕士论文

【摘要】：在IPv4网络向IPv6网络的演进过程中,IPv4与IPv6将长期共存。在IPv4与IPv6共存的混合网络中,存在两方面的问题。首先,混合网络中,由于IPv4与IPv6相互之间并不兼容,使得网络管理人员在规划网络链路资源规划时,只能将IPv4网络与IPv6网络独立规划,会导致链路资源的浪费;其次,由于传统网络设备分布式管理的特性,根据整个网络的实时链路信息制定流量转发策略较为困难,导致了链路资源调度过程中存在缺陷。传统协议过渡机制可以解决协议间兼容的问题,但存在部署困难、协议复杂的缺点。软件定义网络(Software Defined Network,简称SDN),是由美国斯坦福大学提出的一种新型网络架构,其核心思想是通过数据平面与控制平面分离的方式集中化管理网络。SDN架构可以简化网络的配置管理工作,并获知整个网络中的链路状况从而灵活调度网络中的链路资源。本文针对混合网络中链路资源无法灵活调度的问题,提出了一套结合协议过渡技术与SDN网络架构的解决方案。该方法针对传统技术部署复杂的问题进行了改进,在解决数据包跨协议传输问题的同时降低了过渡技术部署难度;针对传统网络设备无法灵活调度链路资源的问题,将SDN数据平面设备接入网络中,结合SDN控制平面程序,可以根据网络中链路的实时状况动态地选择数据流的转发路径。本文实现了一套基于SDN的混合网络链路资源调度系统。首先,本文在RYU控制器的基础上实现了控制平面的五个模块:初始化模块、拓扑模块、过渡模块、链路状况模块和流量调度模块。五个模块协同解决网络中数据包跨协议传输以及链路资源灵活调度的问题。其次,本文开发了一套应用层Web应用,为网络管理人员提供可视化界面,并对系统中的关键数据进行持久化操作。最后,本文在OVS交换机的基础上进行了改进,使系统可以分布式探测网络时延并能配置GRE-in-IPv6隧道至交换机。本文将该系统部署在仿真环境中进行试验。结果表明,本文中提出的基于SDN的混合网络链路资源调度系统,有效地解决了混合网络中链路资源浪费、无法灵活调度的问题。
[Abstract]:In the evolution from IPv4 network to IPv6 network, IPv4 and IPv6 will coexist for a long time. There are two problems in the hybrid network where IPv4 and IPv6 coexist. First of all, because IPv4 and IPv6 are not compatible with each other in hybrid networks, network managers can only plan IPv4 network and IPv6 network independently when planning network link resources, which will lead to the waste of link resources. Because of the characteristics of distributed management of traditional network devices, it is difficult to formulate a traffic forwarding strategy based on the real-time link information of the whole network, which leads to the defects in the scheduling of link resources. The traditional protocol transition mechanism can solve the problem of compatibility between protocols, but it is difficult to deploy and the protocol is complex. Software Defined Network is a new network architecture proposed by Stanford University in the United States. The core idea is that the centralized management network. SDN architecture can simplify the configuration management of the network by separating the data plane from the control plane and obtain the link status of the whole network so as to flexibly schedule the link resources in the network. Aiming at the problem of flexible scheduling of link resources in hybrid networks, a set of solutions combining protocol transition technology and SDN network architecture is proposed in this paper. This method is improved to solve the problem of complex deployment of traditional technology, to solve the problem of data packet transmission across protocols and to reduce the difficulty of deployment of transitional technology, and to solve the problem that traditional network equipment can not flexibly schedule link resources. By connecting the SDN data plane device into the network and combining with the SDN control plane program, the forwarding path of the data stream can be dynamically selected according to the real-time condition of the link in the network. A hybrid network link resource scheduling system based on SDN is implemented in this paper. Firstly, based on the RYU controller, five modules of the control plane are implemented: initialization module, topology module, transition module, link status module and traffic scheduling module. The five modules cooperate to solve the problem of data packet transmission across protocols and flexible scheduling of link resources in the network. Secondly, a set of application layer Web application is developed, which provides a visual interface for network managers and persists the key data in the system. Finally, based on the OVS switch, the system can detect the network delay and configure the GRE-in-IPv6 tunnel to the switch. In this paper, the system is deployed in the simulation environment for testing. The results show that the proposed hybrid network link resource scheduling system based on SDN can effectively solve the problem of link resource waste and flexible scheduling in hybrid network.
【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】：TP393.0

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