基于SDN网络虚拟化的映射技术

发布时间：2018-04-06 22:24

本文选题：SDN　切入点：网络虚拟化　出处：《电子科技大学》2017年硕士论文

【摘要】：在经历了几十年的发展之后,当前的网络体系已经有些不能适应各种新兴业务的需求,变得越来越不堪重负。网络虚拟化的提出为解决这样的僵局提供了一个良好的思路:将底层资源进行抽象处理,使得多个异质的逻辑网络能够独立地部署各自的协议,这对于新的网络架构的发展和协议的验证有着重要的推进作用。SDN网络架构作为一种创新的、将网络控制和数据转发相分离的网络形态,其集中化控制的思想与网络虚拟化的集中控制思想不谋而合,对于网络虚拟化的实现有着得天独厚的优势。因此,本文将SDN网络架构与网络虚拟化技术相结合,重点研究了虚拟化技术中的虚拟网络映射算法,以经典的两步式映射算法为基础,研究了算法在三个不同策略上的改进:第一,考虑到经典算法在链路映射阶段的弊端,本文首先在经典算法的路径映射阶段进行优化,提出了基于链路删除的虚拟网络映射算法,提高了映射效率和映射成功率;第二,考虑到经典算法节点映射的弊端,本文又从节点映射阶段着手,提出了一种指数型收敛的节点资源评价方式,将距离因素考虑到节点映射的选择上来,从而使得映射更加集中,资源利用率得以提高;特别的,本文详细分析了星型网络拓扑的优势特征,针对性地提出了一种更加集中化的映射算法,规避了可用资源的影响,使得映射最大限度的集中化;第三,考虑到前两种改进算法仍然受制于单路径映射瓶颈的事实,本文基于网络可分流的情况,进一步的提出了一种分流比例可控的分流式映射算法,在网络资源稀缺的情况下提高了基础算法的映射接受率;第四,针对基于SDN的网络虚拟化技术,本文设计了基于SDN的网络虚拟化实现模型,完成了可编程化虚拟网络映射平台。
[Abstract]:After decades of development, the current network system has been unable to meet the needs of a variety of new business, becoming more and more overwhelmed.Network virtualization provides a good idea for solving the deadlock: abstract processing of the underlying resources, so that many heterogeneous logical networks can independently deploy their own protocols.This is important for the development of new network architecture and the verification of protocols. SDN network architecture is an innovative network form that separates network control from data forwarding.The idea of centralized control coincides with the centralized control of network virtualization, which has unique advantages for the realization of network virtualization.Therefore, this paper combines SDN network architecture with network virtualization technology, and focuses on the virtual network mapping algorithm in virtualization technology, which is based on the classical two-step mapping algorithm.A virtual network mapping algorithm based on link deletion is proposed to improve the mapping efficiency and the mapping success rate. Secondly, considering the disadvantages of the classical algorithm node mapping, this paper starts from the node mapping stage.In this paper, an exponential convergent node resource evaluation method is proposed, in which the distance factor is taken into account in the selection of node mapping, so that the mapping becomes more centralized and the resource utilization rate can be improved.In this paper, the advantages of star network topology are analyzed in detail, and a more centralized mapping algorithm is proposed to avoid the influence of available resources.In the case of scarce network resources, the mapping acceptance rate of the basic algorithm is improved. Fourthly, aiming at the network virtualization technology based on SDN, this paper designs a network virtualization implementation model based on SDN, and completes the programmable virtual network mapping platform.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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