基于SDN的虚拟网络映射方法设计与实现

发布时间：2018-07-09 10:00

本文选题：虚拟网络映射 + 资源分配　；参考：《北京邮电大学》2017年硕士论文

【摘要】：随着云计算和大数据技术的发展,逐渐形成了云平台,云平台为多租户提供服务,为了能灵活的定制网络服务,逐渐出现了软件定义网络(Software Defined Network,SDN),它具有转发和控制分离、集中控制和网络虚拟化等特点。通过使用网络虚拟化对底层网络进行资源共享和隔离,并将虚拟网络请求使用虚拟网络映射方法映射到底层网络。在虚拟网络映射过程中,底层网络中的关键节点或关键路径被优先映射,容易造成后续映射过程中的关键资源成为资源瓶颈问题,研究该问题对提高运营商的底层网络利用率具有重要意义。论文总结了 SDN网络特点和虚拟网络映射方法的基本理论和研究现状,分析了现有基于拓扑感知的映射方法存在的关键资源被优先分配而成为瓶颈问题,并针对该问题提出了一种应用于SDN网络中基于拓扑感知的虚拟网络映射方法。首先在该方法中,通过使用拓扑感知的资源方法,划分底层资源,在映射时,调整资源映射顺序并根据资源的连接性约束条件进行映射,从而避免关键资源被优先分配而成为瓶颈问题。其次,优化动态重配置方式,监测底层负载情况,当超过阈值时,通过拓扑感知方法检测虚拟网络所处状态,采用路径迁移和重配置的方法进行调整,避免动态映射过程中出现的资源负载不均情况。最后,设计和开发应用平台,对所提方法进行仿真验证。仿真结果表明,提出的基于SDN的虚拟网络映射方法,有效提高了虚拟网络请求接受率、收益开销比、以及底层资源的负载均衡能力。
[Abstract]:With the development of cloud computing and big data technology, cloud platform is gradually formed. Cloud platform provides services for multi-tenant. In order to customize network services flexibly, software defined Network (SDN) has emerged, which has the separation of forwarding and control. Centralized control and network virtualization. Network virtualization is used to share and isolate the resources of the underlying network, and virtual network requests are mapped to the underlying network using the virtual network mapping method. In the process of virtual network mapping, the key nodes or critical paths in the underlying network are mapped first, which easily leads to the bottleneck of resources in the following mapping process. It is of great significance to study this problem to improve the utilization rate of the underlying network of operators. This paper summarizes the characteristics of SDN network and the basic theory and research status of virtual network mapping methods, and analyzes that the key resources of existing mapping methods based on topology awareness are allocated first and become the bottleneck problem. To solve this problem, a topology aware based virtual network mapping method is proposed for SDN networks. In this method, we divide the underlying resources by using topologically aware resource methods. In mapping, we adjust the mapping order of resources and map them according to the connectedness constraints of resources. In order to avoid the priority allocation of key resources and become a bottleneck problem. Secondly, the dynamic reconfiguration mode is optimized, the underlying load is monitored. When the threshold is exceeded, the state of the virtual network is detected by topology perception method, and the path migration and reconfiguration method is adopted to adjust the state of the virtual network. Avoid uneven resource load during dynamic mapping. Finally, the application platform is designed and developed to verify the proposed method. Simulation results show that the proposed virtual network mapping method based on SDN can effectively improve the request acceptance rate of virtual network, the ratio of income to cost, and the load balancing ability of the underlying resources.
【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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