發(fā)布時間：2018-01-06 07:12

  本文關(guān)鍵詞：基于SDN網(wǎng)絡(luò)的負(fù)載均衡和流量工程技術(shù)的研究　出處：《安徽大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： SDN網(wǎng)路 負(fù)載均衡 流量工程 方差分析 約束分級模型

【摘要】：隨著計算機網(wǎng)絡(luò)技術(shù)的不斷發(fā)展,造成現(xiàn)有網(wǎng)絡(luò)協(xié)議種類繁多、網(wǎng)絡(luò)架構(gòu)復(fù)雜且難以維護(hù)。流媒體、視頻會議、云服務(wù)等新型網(wǎng)絡(luò)業(yè)務(wù)的廣泛應(yīng)用,使得人們對網(wǎng)絡(luò)服務(wù)質(zhì)量要求越來越高,也使得如何提高網(wǎng)絡(luò)綜合性能來滿足激增的網(wǎng)絡(luò)應(yīng)用和客戶需求已成為時下熱門的話題和關(guān)注的焦點。近幾年,SDN網(wǎng)絡(luò)的提出為網(wǎng)絡(luò)創(chuàng)新研究提供了新的解決思路。這種新型的可編程網(wǎng)絡(luò)體系架構(gòu)可以從根本上解決一些已存在的網(wǎng)絡(luò)問題,符合當(dāng)今網(wǎng)絡(luò)發(fā)展需求。SDN網(wǎng)絡(luò)允許開發(fā)人員通過網(wǎng)絡(luò)編程的方法控制網(wǎng)絡(luò)流,通過一個控制器,實時地、全局地調(diào)控整個網(wǎng)絡(luò)參數(shù),同時可以監(jiān)控網(wǎng)絡(luò)設(shè)備的資源狀態(tài)。當(dāng)網(wǎng)絡(luò)中出現(xiàn)狀態(tài)變化的時候,底層網(wǎng)絡(luò)設(shè)備會將情況變化通知給控制器,控制機會根據(jù)內(nèi)設(shè)的算法進(jìn)行計算出最優(yōu)的結(jié)果,然后反饋到網(wǎng)絡(luò)底層設(shè)備。底層設(shè)備會根據(jù)計算得到的流表信息對網(wǎng)絡(luò)數(shù)據(jù)進(jìn)行調(diào)度操作。SDN作為下一代網(wǎng)絡(luò)研究創(chuàng)新平臺,提高了網(wǎng)絡(luò)整體的響應(yīng)速度,顯著提高了點到點的轉(zhuǎn)發(fā)速度。OpenFlow是一種新型的將控制與轉(zhuǎn)發(fā)分離的架構(gòu),是SDN網(wǎng)絡(luò)的具體實例,OpenFlow控制器提供整體網(wǎng)絡(luò)的控制和管理,OpenFlow交換機通過匹配流表負(fù)責(zé)數(shù)據(jù)轉(zhuǎn)發(fā)。本論文概述了SDN的起源與發(fā)展,分析了OpenFlow協(xié)議標(biāo)準(zhǔn),深入闡述了Floodlight控制器及Open vSwitch技術(shù)原理。本文針對SDN網(wǎng)絡(luò)的需求,結(jié)合對傳統(tǒng)網(wǎng)絡(luò)的負(fù)載均衡和流量工程技術(shù)的研究,完成主要工作如下：首先,在SDN網(wǎng)絡(luò)中,提出一種基于方差分析的負(fù)載均衡方法。針對現(xiàn)有傳統(tǒng)負(fù)載均衡不能進(jìn)行動態(tài)調(diào)整,對網(wǎng)絡(luò)環(huán)境變化的感知能力差的問題,本文提出利用方差分析的方法對網(wǎng)絡(luò)服務(wù)器端口流量進(jìn)行監(jiān)測,并通過概率選擇的方法來動態(tài)地進(jìn)行流量重定向控制。用戶訪問請求到達(dá)SDN網(wǎng)絡(luò)的某個設(shè)備上,由SDN控制器根據(jù)網(wǎng)絡(luò)運行狀態(tài),動態(tài)地將用戶請求調(diào)度至合適的服務(wù)器,實現(xiàn)了服務(wù)器的負(fù)載均衡。該方法能夠提供從接入、轉(zhuǎn)發(fā)到服務(wù)的全方位容錯,充分發(fā)揮服務(wù)器集群的總負(fù)載能力。通過實驗表明該方法能有效地解決現(xiàn)有傳統(tǒng)負(fù)載均衡可靠性不足,負(fù)載不均的缺點。其次,在SDN網(wǎng)絡(luò)中,本文設(shè)計并實現(xiàn)了面向流量工程的約束分級模型。針對傳統(tǒng)路由協(xié)議只是按照最短路徑進(jìn)行流量路由與轉(zhuǎn)發(fā),當(dāng)最短路徑流量已經(jīng)滿負(fù)荷時仍然將新的流量導(dǎo)入而不分流處理的問題,本文提出基于流量優(yōu)先級的分級模型,當(dāng)最短路徑發(fā)生網(wǎng)絡(luò)阻塞時,可以控制器會根據(jù)業(yè)務(wù)流量優(yōu)先級進(jìn)行分流處理,并分別對其架構(gòu)和功能的實現(xiàn)進(jìn)行了詳細(xì)闡述。最后,通過構(gòu)建的SDN網(wǎng)絡(luò)仿真模擬環(huán)境進(jìn)行實驗,驗證了模型的正確性及有效性。
[Abstract]:With the continuous development of computer network technology, there are many kinds of existing network protocols, the network architecture is complex and difficult to maintain. Streaming media, video conferencing, cloud services and other new network services are widely used. It makes people demand higher and higher quality of network service, and how to improve the comprehensive performance of the network to meet the surge of network applications and customer needs has become a hot topic and focus of attention in recent years. The SDN network provides a new solution for the research of network innovation. This new type of programmable network architecture can fundamentally solve some existing network problems. SDN network allows developers to control network flow through network programming, and to control the whole network parameters in real time and globally through a controller. At the same time, it can monitor the resource status of the network device. When the state changes in the network, the underlying network device will notify the controller of the change of the situation. The control opportunity calculates the optimal result according to the built-in algorithm. Then feedback to the network bottom device. The underlying device will schedule the network data according to the calculated flow table information. SDN will be used as the next generation network research innovation platform to improve the overall response speed of the network. OpenFlow is a new architecture that separates control from forwarding, and it is a concrete example of SDN network. The OpenFlow controller provides the control and management of the whole network. The OpenFlow switch is responsible for data forwarding through the matching flow table. This paper summarizes the origin and development of SDN. This paper analyzes the standard of OpenFlow protocol, expounds the Floodlight controller and the principle of Open vSwitch technology. This paper aims at the requirement of SDN network. Combined with the traditional network load balancing and traffic engineering technology, the main work is as follows: first, in the SDN network. This paper presents a load balancing method based on ANOVA, which aims at the problem that the traditional load balancing can not be dynamically adjusted and has poor perception of the change of network environment. In this paper, an analysis of variance (ANOVA) method is proposed to monitor the port traffic of the network server. Through the method of probability selection, the flow redirection control is carried out dynamically. The user access request reaches a device in the SDN network, and the SDN controller is based on the network running state. Dynamic scheduling of user requests to the appropriate server realizes the load balance of the server, and the method can provide an all-directional fault tolerance from access, forwarding to service. The experiments show that this method can effectively solve the shortcomings of the traditional load balancing reliability and load imbalance. Secondly, in the SDN network. This paper designs and implements a constraint hierarchy model for traffic engineering. The traditional routing protocol only performs traffic routing and forwarding according to the shortest path. When the shortest path traffic is already full load, the new traffic is still imported without shunt processing. In this paper, a hierarchical model based on traffic priority is proposed, when the shortest path is blocked. The controller can deal with the traffic flow according to the priority of traffic flow, and the implementation of its architecture and function are described in detail. Finally, the simulation environment of SDN network is constructed to carry out experiments. The correctness and validity of the model are verified.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TP393.06

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