發(fā)布時間：2019-07-05 19:26

【摘要】：2006年,為了推動校園網(wǎng)絡創(chuàng)新,斯坦福大學首次提出了OpenFlow的概念�；谄渚W(wǎng)絡可編程的特性,SDN概念應運而生。傳統(tǒng)網(wǎng)絡中,如果業(yè)務需求發(fā)生改變,需要重新配置網(wǎng)絡設備,更新維護成本較高。SDN相較于傳統(tǒng)網(wǎng)絡,真正從物理上實現(xiàn)了控制平面與數(shù)據(jù)平面分離,網(wǎng)絡由控制層集中管理,無需依賴底層的網(wǎng)絡設備,更加適用于瞬息萬變的互聯(lián)網(wǎng)業(yè)務環(huán)境。近年來,越來越多研究機構向SDN領域投入大量科研力量。目前,SDN轉發(fā)層已經(jīng)有許多優(yōu)秀技術,幫助用戶搭建底層網(wǎng)絡。然而還沒有一個網(wǎng)絡實驗平臺能夠創(chuàng)建同時滿足規(guī)模性和真實性要求的轉發(fā)層網(wǎng)絡。針對這個背景,本論文結合Mininet和Openvswitch兩種開源技術的優(yōu)點,設計了一個虛實結合的虛擬網(wǎng)絡實驗平臺,為SDN領域研究者提供一個友好的實驗環(huán)境。本文設計與實現(xiàn)的網(wǎng)絡實驗平臺目標是幫助用戶,便捷地創(chuàng)建一個大規(guī)模且真實性高的SDN轉發(fā)層網(wǎng)絡。相較于Mininet仿真平臺,本實驗平臺能夠有效解決Mininet上帶寬和CPU資源的限制,用戶可以在獨立的Openvswitch交換機上運行程序、監(jiān)聽網(wǎng)絡流量等。相較于Openvswitch交換機,本平臺方便用戶擴大網(wǎng)絡規(guī)模,切換拓撲結構時不需要重新安裝Openvswitch交換機。綜上,本實驗平臺能夠根據(jù)用戶需求,靈活模擬各種網(wǎng)絡拓撲結構,生成同時滿足規(guī)模性和真實性要求的SDN轉發(fā)層網(wǎng)絡。為了實現(xiàn)實驗平臺,本文首先調(diào)研了相關技術,明確了系統(tǒng)的技術可行性。然后進行系統(tǒng)需求分析,梳理實驗平臺的功能性需求和非功能性需求。為了實現(xiàn)拓撲劃分和拓撲下發(fā)兩個核心功能,本文基于節(jié)點介數(shù)分析和重疊社區(qū)發(fā)現(xiàn),提出了兩種真實節(jié)點定位方法。同時,通過VxLan隧道技術,解決了虛實交換機間鏈路搭建問題。然后,完成實驗平臺的總體設計和編碼工作,實現(xiàn)各模塊功能和核心工作流程,并進行測試分析。最后,對論文進行總結,并為本網(wǎng)絡實驗平臺提出了未來的研究方向。
[Abstract]:In 2006, in order to promote campus network innovation, Stanford University put forward the concept of OpenFlow for the first time. Based on its network programmable characteristics, the concept of SDN emerges as the times require. In the traditional network, if the service requirements change, it is necessary to reconfigure the network equipment and update and maintain the cost. Compared with the traditional network, SDN really realizes the separation of the control plane and the data plane physically. The network is managed centrally by the control layer and does not need to rely on the underlying network equipment. SDN is more suitable for the rapidly changing Internet business environment. In recent years, more and more research institutions have invested a lot of scientific research force in the field of SDN. At present, the SDN forwarding layer has many excellent technologies to help users build the underlying network. However, no network experimental platform can create a forwarding layer network that meets the requirements of scale and authenticity at the same time. In view of this background, combining the advantages of Mininet and Openvswitch open source technology, this paper designs a virtual network experimental platform which combines virtual and real, which provides a friendly experimental environment for researchers in the field of SDN. The goal of the network experiment platform designed and implemented in this paper is to help users to create a large-scale and high-authenticity SDN forwarding layer network conveniently. Compared with Mininet simulation platform, this experimental platform can effectively solve the limitation of bandwidth and CPU resources on Mininet. Users can run programs on independent Openvswitch switches, monitor network traffic and so on. Compared with Openvswitch switch, this platform is convenient for users to expand the network scale, and it is not necessary to reinstall Openvswitch switch when switching topology. In summary, the experimental platform can flexibly simulate various network topologies according to the needs of users, and generate SDN forwarding layer networks that meet the requirements of scale and authenticity at the same time. In order to realize the experimental platform, this paper first investigates the related technologies and clarifies the technical feasibility of the system. Then the system requirements are analyzed, and the functional and non-functional requirements of the experimental platform are combed. In order to realize the two core functions of topology partition and topology transmission, this paper proposes two real node location methods based on node intermediary analysis and overlapping community discovery. At the same time, the problem of link construction between virtual and real switches is solved by VxLan tunnel technology. Then, the overall design and coding of the experimental platform are completed, and the functions and core workflow of each module are realized, and the test and analysis are carried out. Finally, the paper is summarized, and the future research direction of the network experimental platform is put forward.
【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】：TP393.02

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