本文選題：虛擬網(wǎng)絡映射 + 資源分配��； 參考：《北京郵電大學》2017年碩士論文

【摘要】：隨著云計算和大數(shù)據(jù)技術的發(fā)展,逐漸形成了云平臺,云平臺為多租戶提供服務,為了能靈活的定制網(wǎng)絡服務,逐漸出現(xiàn)了軟件定義網(wǎng)絡(Software Defined Network,SDN),它具有轉(zhuǎn)發(fā)和控制分離、集中控制和網(wǎng)絡虛擬化等特點。通過使用網(wǎng)絡虛擬化對底層網(wǎng)絡進行資源共享和隔離,并將虛擬網(wǎng)絡請求使用虛擬網(wǎng)絡映射方法映射到底層網(wǎng)絡。在虛擬網(wǎng)絡映射過程中,底層網(wǎng)絡中的關鍵節(jié)點或關鍵路徑被優(yōu)先映射,容易造成后續(xù)映射過程中的關鍵資源成為資源瓶頸問題,研究該問題對提高運營商的底層網(wǎng)絡利用率具有重要意義。論文總結(jié)了 SDN網(wǎng)絡特點和虛擬網(wǎng)絡映射方法的基本理論和研究現(xiàn)狀,分析了現(xiàn)有基于拓撲感知的映射方法存在的關鍵資源被優(yōu)先分配而成為瓶頸問題,并針對該問題提出了一種應用于SDN網(wǎng)絡中基于拓撲感知的虛擬網(wǎng)絡映射方法。首先在該方法中,通過使用拓撲感知的資源方法,劃分底層資源,在映射時,調(diào)整資源映射順序并根據(jù)資源的連接性約束條件進行映射,從而避免關鍵資源被優(yōu)先分配而成為瓶頸問題。其次,優(yōu)化動態(tài)重配置方式,監(jiān)測底層負載情況,當超過閾值時,通過拓撲感知方法檢測虛擬網(wǎng)絡所處狀態(tài),采用路徑遷移和重配置的方法進行調(diào)整,避免動態(tài)映射過程中出現(xiàn)的資源負載不均情況。最后,設計和開發(fā)應用平臺,對所提方法進行仿真驗證。仿真結(jié)果表明,提出的基于SDN的虛擬網(wǎng)絡映射方法,有效提高了虛擬網(wǎng)絡請求接受率、收益開銷比、以及底層資源的負載均衡能力。
[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.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP393.0

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