基于软件定义网络的服务质量管控系统的设计与实现

发布时间：2018-03-10 22:24

本文选题：QoS　切入点：OpenFlow　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着网络规模的急剧膨胀和网络业务类型的日益多元化发展,一些新型网络应用如视频会议、VoIP、远程教育等对网络资源的需求越来越高,现有的网络体系架构在满足应用请求的同时暴露出很多的弊端。智慧协同理论(Smart and Cooperative Theory)的提出为研发网络新应用和资源管理提供了一种新的解决方案,资源适配层“控制与转发分离”的设计提供了网络资源动态适配和网络虚拟化的构思,使得网络的控制和管理更加灵活和高效。本文将智慧协同网络理论的设计思想应用在服务质量管控系统中,以OpenFlow协议为实现手段设计一个基于网络虚拟化管控和拉格朗日最短路由路径的服务质量管控系统。首先,本文概述了智慧协同网络理论和软件定义网络体系架构,介绍了当前的QoS(Quality of Service,服务质量)管理模型,针对智慧协同理论中在对网络资源进行灵活管理以满足用户体验的需求,本文提出了一种在SDN中基于路由动态分配与网络资源虚拟化相结合的资源管理方案。其次,分别介绍智慧协同网络中路由动态分配和网络资源虚拟化管理的实现机制,阐述了软件定义网络中基于多约束条件的QoS路径优化算法,通过实时监控网络资源的使用状况,对拥塞链路上的流量进行重路由,降低因共享路径而产生的负载,实现了对网络资源的动态管理。由于多约束条件的QoS路由计算问题是NP-Complete,提出基于拉格朗日松弛的启发式算法计算最优解。最后,本文在资源动态分配的基础上进一步提出了网络资源虚拟化的设计方案,通过对网络拓扑、流量、带宽的隔离实现对网络资源的灵活分配。最后设计模拟实验场景和物理实验台测试环境对本文提出的资源管理方案进行对比验证,实验结果表明本文提出的资源管理方案能够充分利用网络可用资源,快速调整网络的负载状况,提高了网络资源利用率,保障流量的可靠传输。
[Abstract]:With the rapid expansion of network scale and the increasingly diversified development of network business types, some new network applications, such as videoconferencing VoIP, distance education and so on, have higher and higher demand for network resources. The existing network architecture not only meets the application requirements but also exposes many disadvantages. Smart and Cooperative Theory provides a new solution for developing new network applications and resource management. The design of the resource adaptation layer "separation of control and forwarding" provides the conception of dynamic adaptation and virtualization of network resources. It makes the control and management of network more flexible and efficient. In this paper, the design idea of intelligent cooperative network theory is applied to the quality of service control system. A QoS control system based on network virtualization control and Lagrange shortest routing path is designed by means of OpenFlow protocol. Firstly, the intelligent cooperative network theory and the software defined network architecture are summarized in this paper. This paper introduces the current QoS(Quality of Service (quality of Service) management model, aiming at the flexible management of network resources in intelligent collaboration theory to meet the needs of user experience. This paper proposes a resource management scheme in SDN based on the combination of routing dynamic allocation and network resource virtualization. Secondly, the implementation mechanisms of routing dynamic allocation and network resource virtualization management in intelligent collaborative networks are introduced respectively. This paper expounds the QoS path optimization algorithm based on multi-constraint conditions in the software-defined network. By monitoring the use of network resources in real time, the traffic on the congested link is rerouted to reduce the load generated by the shared path. The dynamic management of network resources is realized. Since the QoS routing problem with multiple constraints is NP-Complete, a heuristic algorithm based on Lagrange relaxation is proposed to calculate the optimal solution. Based on the dynamic allocation of resources, this paper further proposes a design scheme of network resource virtualization, through the network topology, traffic, The isolation of bandwidth realizes the flexible allocation of network resources. Finally, a simulation experiment scenario and a test environment are designed to verify the resource management scheme proposed in this paper. The experimental results show that the proposed resource management scheme can make full use of the available resources of the network, adjust the load status of the network quickly, improve the utilization rate of network resources, and ensure the reliable transmission of traffic.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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