發(fā)布時間：2018-04-15 04:33

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

【摘要】：隨著互聯(lián)網(wǎng)的飛速發(fā)展,網(wǎng)絡中業(yè)務種類日益增多,不同種類業(yè)務對服務質(zhì)量(Quality of Service,QoS)的需求各不相同。然而,傳統(tǒng)數(shù)據(jù)報網(wǎng)絡對所有的業(yè)務都只提供盡力而為的服務。這使得在擁塞的情況下,網(wǎng)絡很難保障不同業(yè)務的不同QoS需求。軟件定義網(wǎng)絡(Software Defined Network,SDN)作為一種新型網(wǎng)絡,它解耦了傳統(tǒng)網(wǎng)絡中的控制層和轉(zhuǎn)發(fā)層,使得控制層能獲取全網(wǎng)拓撲視圖并集中控制轉(zhuǎn)發(fā)層的行為,為業(yè)務數(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)絡可編程、易擴展以及有較強的網(wǎng)絡管控能力等特點,研究SDN網(wǎng)絡中的QoS控制技術,主要工作有:1)對四種不同種類業(yè)務進行了等級的區(qū)分,并設定不同等級值,在此基礎上,提出了SDN網(wǎng)絡中區(qū)分業(yè)務優(yōu)先級的QoS控制框架,對最高優(yōu)先級業(yè)務進行動態(tài)QoS路由,對其他等級業(yè)務進行以跳數(shù)為代價最短路徑算法的路由,使用隊列調(diào)度管理區(qū)分保障不同等級業(yè)務的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)務使用拉格朗日松弛聚合代價(Lagrange Relaxation Based Aggregated Cost,LARAC)算法進行動態(tài)QoS路由,以保障最高優(yōu)先級業(yè)務端到端的時延;3)提出了基于優(yōu)先級隊列(Priority Queue,PQ)調(diào)度算法、差額加權輪詢(Deficit Weighted Round Robin,DWRR)隊列調(diào)度算法和加權隨機早期檢測(Weighted Random Early Detection,WRED)隊列管理算法的隊列調(diào)度管理策略,進行不同優(yōu)先級業(yè)務的區(qū)分調(diào)度管理;4)改進了OpenFlow協(xié)議,使得OpenFlow協(xié)議能支持隊列命令,以對隊列調(diào)度管理策略進行靈活配置。本文對QoS控制框架的拓撲管理模塊、網(wǎng)絡監(jiān)測模塊、路徑計算模塊、路由管理模塊、隊列代理模塊和流量管理模塊分別進行了實現(xiàn),并在搭建的真實SDN網(wǎng)絡中,對QoS控制框架進行了功能和性能測試。實驗結(jié)果表明,QoS控制框架能對最高優(yōu)先級業(yè)務進行動態(tài)QoS路由,較好地保證了最高優(yōu)先級業(yè)務端到端的時延,并區(qū)分保障了不同等級業(yè)務的QoS,同時還提高了網(wǎng)絡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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP393.0

【參考文獻】

相關期刊論文 前5條

1 YAN Jinyao;ZHANG Hailong;SHUAI Qianjun;LIU Bo;GUO Xiao;;HiQoS:An SDN-Based Multipath QoS Solution[J];中國通信;2015年05期

2 王文東;齊慶磊;龔向陽;胡延楠;闕喜戎;;一種基于軟件定義網(wǎng)絡的自治服務質(zhì)量管理機制(英文)[J];中國通信;2014年07期

3 李曉利;郭宇春;;QoS技術中令牌桶算法實現(xiàn)方式比較[J];中興通訊技術;2007年03期

4 廖慧芬;邵小兵;;動態(tài)規(guī)劃算法的原理及應用[J];中國科技信息;2005年21期

5 陳彥萍,李增智,宋承謙,薛可;基于Intserv和Diffserv的端到端QoS研究[J];微電子學與計算機;2003年11期

相關博士學位論文 前1條

1 王彬;TCP/IP網(wǎng)絡擁塞控制策略研究[D];浙江大學;2004年

相關碩士學位論文 前1條

1 徐宗琦;業(yè)務重要性評估與Ad Hoc網(wǎng)絡帶寬分配技術研究[D];電子科技大學;2013年

，

本文編號：1752559