本文選題：軟件定義網(wǎng)絡(luò) + OpenFlow協(xié)議�。� 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：隨著互聯(lián)網(wǎng)的飛速發(fā)展,網(wǎng)絡(luò)中業(yè)務(wù)種類日益增多,不同種類業(yè)務(wù)對服務(wù)質(zhì)量(Quality of Service,QoS)的需求各不相同。然而,傳統(tǒng)數(shù)據(jù)報(bào)網(wǎng)絡(luò)對所有的業(yè)務(wù)都只提供盡力而為的服務(wù)。這使得在擁塞的情況下,網(wǎng)絡(luò)很難保障不同業(yè)務(wù)的不同QoS需求。軟件定義網(wǎng)絡(luò)(Software Defined Network,SDN)作為一種新型網(wǎng)絡(luò),它解耦了傳統(tǒng)網(wǎng)絡(luò)中的控制層和轉(zhuǎn)發(fā)層,使得控制層能獲取全網(wǎng)拓?fù)湟晥D并集中控制轉(zhuǎn)發(fā)層的行為,為業(yè)務(wù)數(shù)據(jù)流提供靈活的QoS保證,這為QoS的研究提供了一個新思路。本文利用SDN網(wǎng)絡(luò)可編程、易擴(kuò)展以及有較強(qiáng)的網(wǎng)絡(luò)管控能力等特點(diǎn),研究SDN網(wǎng)絡(luò)中的QoS控制技術(shù),主要工作有:1)對四種不同種類業(yè)務(wù)進(jìn)行了等級的區(qū)分,并設(shè)定不同等級值,在此基礎(chǔ)上,提出了SDN網(wǎng)絡(luò)中區(qū)分業(yè)務(wù)優(yōu)先級的QoS控制框架,對最高優(yōu)先級業(yè)務(wù)進(jìn)行動態(tài)QoS路由,對其他等級業(yè)務(wù)進(jìn)行以跳數(shù)為代價最短路徑算法的路由,使用隊(duì)列調(diào)度管理區(qū)分保障不同等級業(yè)務(wù)的QoS;2)以鏈路擁塞率、路徑跳數(shù)為代價,路徑時延為約束條件,對最高優(yōu)先級業(yè)務(wù)使用拉格朗日松弛聚合代價(Lagrange Relaxation Based Aggregated Cost,LARAC)算法進(jìn)行動態(tài)QoS路由,以保障最高優(yōu)先級業(yè)務(wù)端到端的時延;3)提出了基于優(yōu)先級隊(duì)列(Priority Queue,PQ)調(diào)度算法、差額加權(quán)輪詢(Deficit Weighted Round Robin,DWRR)隊(duì)列調(diào)度算法和加權(quán)隨機(jī)早期檢測(Weighted Random Early Detection,WRED)隊(duì)列管理算法的隊(duì)列調(diào)度管理策略,進(jìn)行不同優(yōu)先級業(yè)務(wù)的區(qū)分調(diào)度管理;4)改進(jìn)了OpenFlow協(xié)議,使得OpenFlow協(xié)議能支持隊(duì)列命令,以對隊(duì)列調(diào)度管理策略進(jìn)行靈活配置。本文對QoS控制框架的拓?fù)涔芾砟K、網(wǎng)絡(luò)監(jiān)測模塊、路徑計(jì)算模塊、路由管理模塊、隊(duì)列代理模塊和流量管理模塊分別進(jìn)行了實(shí)現(xiàn),并在搭建的真實(shí)SDN網(wǎng)絡(luò)中,對QoS控制框架進(jìn)行了功能和性能測試。實(shí)驗(yàn)結(jié)果表明,QoS控制框架能對最高優(yōu)先級業(yè)務(wù)進(jìn)行動態(tài)QoS路由,較好地保證了最高優(yōu)先級業(yè)務(wù)端到端的時延,并區(qū)分保障了不同等級業(yè)務(wù)的QoS,同時還提高了網(wǎng)絡(luò)的吞吐量和帶寬的利用率。
[Abstract]:With the rapid development of the Internet, the types of services in the network are increasing day by day. Different kinds of services require different quality of Service QoS (QoS).However, the traditional Datagram network provides only the best possible service for all services.This makes it difficult to secure different QoS requirements for different services under congested conditions.As a new type of network, Software Defined Network (SDN) decouples the control layer and the forwarding layer in the traditional network, enables the control layer to obtain the topology view of the whole network and centrally control the behavior of the forwarding layer, and provides flexible QoS guarantee for the service data flow.This provides a new idea for the study of QoS.This paper makes use of the characteristics of SDN network programmable, easy to expand and strong network control ability to study the QoS control technology in SDN network. The main work of this paper is to distinguish four kinds of different kinds of services, and to set up different grade values.On this basis, a QoS control framework is proposed to distinguish service priority in SDN network. Dynamic QoS routing is carried out for the highest priority services, and the shortest path algorithm at the cost of hops is used to route the other services at the cost of the number of hops.Queue scheduling management is used to distinguish the QoS of different classes of traffic at the cost of link congestion rate, number of path hops, and path delay.The Lagrange Relaxation Based Aggregated Code (LARAC) algorithm is used to route the highest priority services dynamically in order to guarantee the end-to-end delay of the highest priority services. A priority queue based scheduling algorithm is proposed.Difference weighted polling Weighted Round queue scheduling algorithm and weighted Random Early Detection (WREDR) queue management strategy, the differentiated scheduling management of different priority services (4) improves the OpenFlow protocol.The OpenFlow protocol can support queue commands to configure queue scheduling management policy flexibly.In this paper, the topology management module, network monitoring module, path calculation module, routing management module, queue agent module and traffic management module of QoS control framework are implemented, respectively, and are implemented in the real SDN network.The function and performance of QoS control framework are tested.The experimental results show that the QoS control framework can dynamically route the highest priority services and ensure the end-to-end delay of the highest priority services.The QoS of different levels of traffic is protected, and the throughput and bandwidth utilization of the network are improved.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP393.0

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