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

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

【摘要】：隨著計算機網(wǎng)絡技術(shù)的不斷發(fā)展,造成現(xiàn)有網(wǎng)絡協(xié)議種類繁多、網(wǎng)絡架構(gòu)復雜且難以維護。流媒體、視頻會議、云服務等新型網(wǎng)絡業(yè)務的廣泛應用,使得人們對網(wǎng)絡服務質(zhì)量要求越來越高,也使得如何提高網(wǎng)絡綜合性能來滿足激增的網(wǎng)絡應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)絡的提出為網(wǎng)絡創(chuàng)新研究提供了新的解決思路。這種新型的可編程網(wǎng)絡體系架構(gòu)可以從根本上解決一些已存在的網(wǎng)絡問題,符合當今網(wǎng)絡發(fā)展需求。SDN網(wǎng)絡允許開發(fā)人員通過網(wǎng)絡編程的方法控制網(wǎng)絡流,通過一個控制器,實時地、全局地調(diào)控整個網(wǎng)絡參數(shù),同時可以監(jiān)控網(wǎng)絡設備的資源狀態(tài)。當網(wǎng)絡中出現(xiàn)狀態(tài)變化的時候,底層網(wǎng)絡設備會將情況變化通知給控制器,控制機會根據(jù)內(nèi)設的算法進行計算出最優(yōu)的結(jié)果,然后反饋到網(wǎng)絡底層設備。底層設備會根據(jù)計算得到的流表信息對網(wǎng)絡數(shù)據(jù)進行調(diào)度操作。SDN作為下一代網(wǎng)絡研究創(chuàng)新平臺,提高了網(wǎng)絡整體的響應速度,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)絡的具體實例,OpenFlow控制器提供整體網(wǎng)絡的控制和管理,OpenFlow交換機通過匹配流表負責數(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)議標準,深入闡述了Floodlight控制器及Open vSwitch技術(shù)原理。本文針對SDN網(wǎng)絡的需求,結(jié)合對傳統(tǒng)網(wǎng)絡的負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)絡中,提出一種基于方差分析的負載均衡方法。針對現(xiàn)有傳統(tǒng)負載均衡不能進行動態(tài)調(diào)整,對網(wǎng)絡環(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)絡服務器端口流量進行監(jiān)測,并通過概率選擇的方法來動態(tài)地進行流量重定向控制。用戶訪問請求到達SDN網(wǎng)絡的某個設備上,由SDN控制器根據(jù)網(wǎng)絡運行狀態(tài),動態(tài)地將用戶請求調(diào)度至合適的服務器,實現(xiàn)了服務器的負載均衡。該方法能夠提供從接入、轉(zhuǎn)發(fā)到服務的全方位容錯,充分發(fā)揮服務器集群的總負載能力。通過實驗表明該方法能有效地解決現(xiàn)有傳統(tǒng)負載均衡可靠性不足,負載不均的缺點。其次,在SDN網(wǎng)絡中,本文設計并實現(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行流量路由與轉(zhuǎn)發(fā),當最短路徑流量已經(jīng)滿負荷時仍然將新的流量導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,當最短路徑發(fā)生網(wǎng)絡阻塞時,可以控制器會根據(jù)業(yè)務流量優(yōu)先級進行分流處理,并分別對其架構(gòu)和功能的實現(xiàn)進行了詳細闡述。最后,通過構(gòu)建的SDN網(wǎng)絡仿真模擬環(huán)境進行實驗,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.
【學位授予單位】：安徽大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TP393.06

【參考文獻】

相關(guān)期刊論文 前4條

1 畢軍;;SDN體系結(jié)構(gòu)與未來網(wǎng)絡體系結(jié)構(gòu)創(chuàng)新環(huán)境[J];電信科學;2013年08期

2 黃海峰;;邁出規(guī)模應用第一步:“聯(lián)盟”誕生推動SDN商用化[J];通信世界;2014年22期

3 馮變英;張旭;張春枝;;關(guān)于t檢驗方差分析及多重比較的研究[J];太原師范學院學報(自然科學版);2012年04期

4 周燁;李勇;王芳;楊旭;蘇厲;金德鵬;曾烈光;;基于OpenFlow的網(wǎng)絡實驗平臺技術(shù)[J];清華大學學報(自然科學版);2012年11期

，

本文編號：1386812