發(fā)布時(shí)間：2018-10-26 13:16

【摘要】：隨著互聯(lián)網(wǎng)的迅猛發(fā)展,網(wǎng)絡(luò)流量呈現(xiàn)爆發(fā)式增長(zhǎng),為了解決網(wǎng)絡(luò)擁堵,提高鏈路利用率,需要進(jìn)行網(wǎng)絡(luò)服務(wù)質(zhì)量的研究。流量調(diào)度作為保證網(wǎng)絡(luò)服務(wù)質(zhì)量的方案之一,得到了許多研究機(jī)構(gòu)的重視。目前國(guó)內(nèi)外已開展了流量調(diào)度領(lǐng)域的很多研究,現(xiàn)有的方案是在傳統(tǒng)網(wǎng)絡(luò)架構(gòu)的基礎(chǔ)上進(jìn)行漸進(jìn)性修補(bǔ),但這種策略使得網(wǎng)絡(luò)結(jié)構(gòu)越來越冗余,并沒有從根本上解決問題。軟件定義網(wǎng)絡(luò)(Software Defined Network,SDN)是近年來提出的一種新型網(wǎng)絡(luò)體系結(jié)構(gòu),其核心思想是將網(wǎng)絡(luò)的傳輸和控制兩個(gè)主要功能進(jìn)行分離,利用控制器提供的應(yīng)用編程接口,靈活地編寫多種網(wǎng)絡(luò)應(yīng)用。當(dāng)前SDN正成為全球網(wǎng)絡(luò)界炙手可熱的焦點(diǎn),Google在其數(shù)據(jù)中心骨干網(wǎng)絡(luò)中大規(guī)模地使用了OpenFlow技術(shù),使鏈路利用率從30%提升到95%。同時(shí),以VMware斥資12.6億美元收購Nicira為代表的一系列投、融資事件,標(biāo)志著SDN發(fā)展前景得到了業(yè)界的廣泛認(rèn)可。通過SDN技術(shù)可以實(shí)時(shí)感知網(wǎng)絡(luò)流量,建立全局網(wǎng)絡(luò)視圖,利用路由算法合理地進(jìn)行流量調(diào)度,為全局優(yōu)化決策提供基礎(chǔ)支撐,從而解決網(wǎng)絡(luò)擁塞問題。為了解決當(dāng)前網(wǎng)絡(luò)鏈路由于流量的爆發(fā)式增長(zhǎng)所帶來的網(wǎng)絡(luò)擁堵等問題,本論文研究面向SDN的流量調(diào)度技術(shù)。我們從四個(gè)方面開展研究工作:一是SDN相關(guān)技術(shù)和蟻群算法的研究,二是實(shí)驗(yàn)平臺(tái)的搭建,三是流量調(diào)度策略的設(shè)計(jì)與部署,四是實(shí)驗(yàn)的開展與實(shí)驗(yàn)結(jié)果的分析。本文首先介紹了研究背景、目的、內(nèi)容、意義以及全文的組織結(jié)構(gòu),然后分析傳統(tǒng)的流量調(diào)度技術(shù)以及面向SDN的流量調(diào)度技術(shù),并進(jìn)行了流量調(diào)度系統(tǒng)總體設(shè)計(jì)。之后,對(duì)該系統(tǒng)所采用的OpenFlow技術(shù)、POX控制器、Mininet網(wǎng)絡(luò)仿真平臺(tái)中的相關(guān)組件與技術(shù)進(jìn)行分析,并進(jìn)行該系統(tǒng)的具體開發(fā)。該系統(tǒng)是以Mininet 2.0為仿真平臺(tái),遵循OpenFlow協(xié)議的1.0版本,并選擇POX控制器在控制層面完成相關(guān)工作,在其上開發(fā)流量調(diào)度應(yīng)用。流量調(diào)度應(yīng)用分為3個(gè)模塊:全局拓?fù)鋵W(xué)習(xí)模塊,鏈路狀態(tài)評(píng)估模塊,蟻群算法路由模塊。基于構(gòu)建的面向SDN的流量調(diào)度系統(tǒng),我們開展了相關(guān)實(shí)驗(yàn),對(duì)本文所提出的鏈路負(fù)載均衡解決方案進(jìn)行了性能分析。最后對(duì)本文所做工作進(jìn)行總結(jié),并對(duì)后續(xù)研究方向進(jìn)行展望。
[Abstract]:With the rapid development of the Internet, the network traffic is increasing explosively. In order to solve the network congestion and improve the link utilization, it is necessary to study the quality of network service. As one of the schemes to guarantee the quality of service (QoS), traffic scheduling has been paid much attention by many research institutions. At present, many researches have been carried out in the field of traffic scheduling at home and abroad. The existing scheme is based on the traditional network architecture, but this strategy makes the network structure more and more redundant, and does not fundamentally solve the problem. Software defined Network (Software Defined Network,SDN (Software Defined Network,SDN) is a new network architecture proposed in recent years. Its core idea is to separate the two main functions of network transmission and control, and to use the application programming interface provided by the controller. Write a variety of network applications flexibly. At present, SDN is becoming the hot focus in the global network. Google uses OpenFlow technology in its data center backbone network on a large scale, which makes the link utilization rate increase from 30% to 95%. Meanwhile, a series of investment and financing events, represented by VMware's $1.26 billion acquisition of Nicira, signaled that SDN's development prospects have been widely recognized by the industry. Through SDN technology, the network traffic can be sensed in real time, the global network view can be set up, and the routing algorithm can be used to schedule the traffic reasonably, which can provide the basic support for the global optimization decision, so as to solve the network congestion problem. In order to solve the problem of network congestion caused by the explosive growth of network traffic, this paper studies the traffic scheduling technology for SDN. We carry out research work from four aspects: first, the research of SDN related technology and ant colony algorithm; second, the construction of experimental platform; third, the design and deployment of traffic scheduling strategy; and fourth, the development of experiment and the analysis of experimental results. This paper first introduces the research background, purpose, content, significance and organization structure of the paper, then analyzes the traditional traffic scheduling technology and the SDN oriented traffic scheduling technology, and carries out the overall design of the traffic scheduling system. Then, the OpenFlow technology, POX controller, Mininet network simulation platform and related components and technologies are analyzed, and the specific development of the system is carried out. The system takes Mininet 2.0 as the simulation platform, follows the 1.0 version of OpenFlow protocol, and selects the POX controller to complete the related work at the control level, and develops the application of traffic scheduling on it. Traffic scheduling applications are divided into three modules: global topology learning module, link state evaluation module, ant colony algorithm routing module. Based on the SDN oriented traffic scheduling system, we have carried out relevant experiments and analyzed the performance of the proposed link load balancing solution. Finally, the work done in this paper is summarized, and the future research direction is prospected.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.06

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