本文選題：數(shù)據(jù)中心 + 光互聯(lián)　； 參考：《北京郵電大學(xué)》2014年碩士論文

【摘要】：目前在數(shù)據(jù)中心(Data Center, DC)中,互聯(lián)網(wǎng)和新型應(yīng)用的快速發(fā)展,帶動(dòng)海量的數(shù)據(jù)流量增長(zhǎng),使得數(shù)據(jù)中心在網(wǎng)絡(luò)時(shí)延、帶寬和可靠性等方面提出了更高的要求。傳統(tǒng)的電交換網(wǎng)絡(luò)越來越難以滿足新型數(shù)據(jù)中心的需求,而有著低時(shí)延、高帶寬特點(diǎn)的光交換網(wǎng)絡(luò)開始嶄露頭角,得到廣泛應(yīng)用。在數(shù)據(jù)中心光互連網(wǎng)絡(luò)中,集中式控制方式有著較強(qiáng)的靈活性和可擴(kuò)展性,因此而得到了廣泛的親睞。開源的OpenFlow是實(shí)現(xiàn)集中式控制最為成熟的手段。集中式控制和OpenFlow協(xié)議相結(jié)合,可在數(shù)據(jù)中心光互聯(lián)網(wǎng)絡(luò)中,進(jìn)行富有想象力的創(chuàng)新。另外,從網(wǎng)絡(luò)資源調(diào)度角度講,傳統(tǒng)網(wǎng)絡(luò)中各層資源分層控制和調(diào)度,使得各層資源利用不夠充分。而在基于OpenFlow的集中式控制網(wǎng)絡(luò)中,實(shí)現(xiàn)資源的跨層調(diào)度變得簡(jiǎn)單易實(shí)現(xiàn),跨層調(diào)度可以提高網(wǎng)絡(luò)資源的利用率,大大簡(jiǎn)化流的處理流程。在數(shù)據(jù)中心網(wǎng)絡(luò)中,TCP incast是普遍存在于多對(duì)一通信模型中的沖突問題。TCP incast發(fā)生后,網(wǎng)絡(luò)吞吐率會(huì)出現(xiàn)嚴(yán)重的崩潰現(xiàn)象。本文針對(duì)TCP incast問題提出了一套在數(shù)據(jù)中心光互聯(lián)網(wǎng)絡(luò)中的跨層調(diào)度解決方案。利用OpenFlow的集中控制和跨層調(diào)度,使得TCP incast吞吐率崩潰的問題得到有效的緩解。 首先,本論文基于光突發(fā)傳送網(wǎng)(OBTN)的數(shù)據(jù)中心光互連網(wǎng)絡(luò),發(fā)現(xiàn)網(wǎng)絡(luò)中TCP incast問題主要存在于節(jié)點(diǎn)業(yè)務(wù)接入側(cè)和OBTN環(huán)網(wǎng)內(nèi),并分別制定了解決方案。在業(yè)務(wù)接入側(cè),本論文設(shè)計(jì)了基于OpenFlow的跨層調(diào)度機(jī)制。借助OpenFlow網(wǎng)絡(luò)控制器和應(yīng)用層業(yè)務(wù)控制器協(xié)同控制,即通過監(jiān)控節(jié)點(diǎn)緩沖區(qū)的占用率,進(jìn)而控制多對(duì)一通信模型中并發(fā)服務(wù)器的數(shù)量,可以有效避免數(shù)據(jù)中心內(nèi)光互聯(lián)網(wǎng)絡(luò)中TCP incast問題。針對(duì)該跨層調(diào)度機(jī)制,本論文完成了OpenFlow協(xié)議拓展,并對(duì)跨層調(diào)度機(jī)制的性能做了仿真驗(yàn)證。 其次,在OBTN環(huán)網(wǎng)內(nèi),結(jié)合OpenFlow網(wǎng)絡(luò)控制器的業(yè)務(wù)監(jiān)控,本論文提出了針對(duì)incast問題的改進(jìn)型動(dòng)態(tài)帶寬分配(DBA)算法。該算法將所有相關(guān)的incast業(yè)務(wù)作為一個(gè)整體,優(yōu)先為其授權(quán)和配置帶寬資源,可以有效改善incast業(yè)務(wù)的應(yīng)用層性能,并提高整個(gè)網(wǎng)絡(luò)的吞吐率。本論文通過數(shù)值仿真和網(wǎng)絡(luò)仿真驗(yàn)證了改進(jìn)型DBA算法的性能。
[Abstract]:At present, with the rapid development of the Internet and new applications in data Center (DCD), massive data traffic is increased, which makes the data center require higher network delay, bandwidth and reliability. Traditional switching networks are becoming more and more difficult to meet the needs of new data centers. Optical switching networks with low delay and high bandwidth are emerging and widely used. In the data center optical interconnection network, the centralized control mode has strong flexibility and scalability, so it has been widely used. Open source OpenFlow is the most mature means to realize centralized control. The combination of centralized control and OpenFlow protocol enables imaginative innovation in the data center optical Internet. In addition, from the point of view of network resource scheduling, the hierarchical control and scheduling of each layer of resources in the traditional network make the resource utilization of each layer insufficient. In the centralized control network based on OpenFlow, the realization of cross-layer scheduling of resources becomes simple and easy. Cross-layer scheduling can improve the utilization of network resources and greatly simplify the flow process. In data center networks, TCP / incast is a common collision problem in a many-to-one communication model. After TCP / incast occurs, the network throughput will collapse seriously. In this paper, we propose a cross-layer scheduling solution for incast in data center optical interconnection networks. Using the centralized control of OpenFlow and cross-layer scheduling, the problem of TCP incast throughput collapse can be effectively alleviated. Firstly, based on the data center optical interconnection network of optical burst transport network (OBTNN), we find that the problem of incast in the network mainly exists in the access side of node services and the OBTN ring network, and the solutions are worked out respectively. In the service access side, this paper designs a cross-layer scheduling mechanism based on OpenFlow. With the help of OpenFlow network controller and application layer service controller, the number of concurrent servers in a multi-to-one communication model is controlled by monitoring the occupancy rate of node buffer. It can effectively avoid the problem of incast in the optical network in the data center. In this paper, the OpenFlow protocol is extended and the performance of the cross-layer scheduling mechanism is verified by simulation. Secondly, an improved dynamic bandwidth allocation algorithm for incast problem is proposed in this paper, combined with the traffic monitoring of OpenFlow network controller in OBTN ring network. This algorithm takes all the related incast services as a whole and gives priority to authorize and configure bandwidth resources. It can effectively improve the performance of the application layer of incast services and improve the throughput of the whole network. The performance of the improved DBA algorithm is verified by numerical simulation and network simulation.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP308

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本文編號(hào)：2036537