本文選題：SDN　切入點：網(wǎng)絡虛擬化　出處：《電子科技大學》2017年碩士論文

【摘要】：在經(jīng)歷了幾十年的發(fā)展之后,當前的網(wǎng)絡體系已經(jīng)有些不能適應各種新興業(yè)務的需求,變得越來越不堪重負。網(wǎng)絡虛擬化的提出為解決這樣的僵局提供了一個良好的思路:將底層資源進行抽象處理,使得多個異質的邏輯網(wǎng)絡能夠獨立地部署各自的協(xié)議,這對于新的網(wǎng)絡架構的發(fā)展和協(xié)議的驗證有著重要的推進作用。SDN網(wǎng)絡架構作為一種創(chuàng)新的、將網(wǎng)絡控制和數(shù)據(jù)轉發(fā)相分離的網(wǎng)絡形態(tài),其集中化控制的思想與網(wǎng)絡虛擬化的集中控制思想不謀而合,對于網(wǎng)絡虛擬化的實現(xiàn)有著得天獨厚的優(yōu)勢。因此,本文將SDN網(wǎng)絡架構與網(wǎng)絡虛擬化技術相結合,重點研究了虛擬化技術中的虛擬網(wǎng)絡映射算法,以經(jīng)典的兩步式映射算法為基礎,研究了算法在三個不同策略上的改進:第一,考慮到經(jīng)典算法在鏈路映射階段的弊端,本文首先在經(jīng)典算法的路徑映射階段進行優(yōu)化,提出了基于鏈路刪除的虛擬網(wǎng)絡映射算法,提高了映射效率和映射成功率;第二,考慮到經(jīng)典算法節(jié)點映射的弊端,本文又從節(jié)點映射階段著手,提出了一種指數(shù)型收斂的節(jié)點資源評價方式,將距離因素考慮到節(jié)點映射的選擇上來,從而使得映射更加集中,資源利用率得以提高;特別的,本文詳細分析了星型網(wǎng)絡拓撲的優(yōu)勢特征,針對性地提出了一種更加集中化的映射算法,規(guī)避了可用資源的影響,使得映射最大限度的集中化;第三,考慮到前兩種改進算法仍然受制于單路徑映射瓶頸的事實,本文基于網(wǎng)絡可分流的情況,進一步的提出了一種分流比例可控的分流式映射算法,在網(wǎng)絡資源稀缺的情況下提高了基礎算法的映射接受率;第四,針對基于SDN的網(wǎng)絡虛擬化技術,本文設計了基于SDN的網(wǎng)絡虛擬化實現(xiàn)模型,完成了可編程化虛擬網(wǎng)絡映射平臺。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP393.0

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