本文選題：軟件定義網(wǎng)絡(luò)　切入點(diǎn)：OpenFlow　出處：《中國科學(xué)技術(shù)大學(xué)》2014年碩士論文

【摘要】：SDN (Software Defined Network)/OpenFlow網(wǎng)絡(luò)是針對當(dāng)前網(wǎng)絡(luò)架構(gòu)的一場變革,其核心理念是數(shù)據(jù)轉(zhuǎn)發(fā)和控制層面的分離。由于其良好的可控可管理性,SDN/OpenFlow網(wǎng)絡(luò)已經(jīng)越來越受到業(yè)界的重視。SDN的體系架構(gòu)可以分為應(yīng)用層、控制層和設(shè)備層�？刂破鲗雍驮O(shè)備層分別完成了網(wǎng)絡(luò)的控制管理和數(shù)據(jù)包的轉(zhuǎn)發(fā)兩個功能,應(yīng)用層則為用戶自定義的一些網(wǎng)絡(luò)應(yīng)用。OpenFlow網(wǎng)絡(luò)可以看作為SDN思想的一種具體實(shí)現(xiàn)。OpenFlow網(wǎng)絡(luò)主要由控制器、OpenFlow交換機(jī)和OpenFlow標(biāo)準(zhǔn)協(xié)議三部分組成,控制器和OpenFlow交換機(jī)通過OpenFlow標(biāo)準(zhǔn)協(xié)議完成信令的交互。 OpenFlow網(wǎng)絡(luò)面臨的技術(shù)挑戰(zhàn)：(1)擁塞路由管理問題,傳統(tǒng)的網(wǎng)絡(luò)側(cè)擁塞管理方案是在擁塞節(jié)點(diǎn)附近選擇數(shù)據(jù)流進(jìn)行重路由,這種方案的缺點(diǎn)是不能充分利用網(wǎng)絡(luò)拓?fù)滟Y源。以擁塞節(jié)點(diǎn)作為錨點(diǎn)進(jìn)行重路由,在某些情況下,無法選擇最優(yōu)路徑,甚至無法得出可行路徑。在OpenFlow網(wǎng)絡(luò)中我們可以利用控制器對網(wǎng)絡(luò)資源全局管理的優(yōu)勢提出一種更加高效的網(wǎng)絡(luò)側(cè)擁塞路由管理策略；(2)過渡網(wǎng)絡(luò)路由問題,OpenFlow網(wǎng)絡(luò)正處于發(fā)展初期,大規(guī)模鋪設(shè)OpenFlow網(wǎng)絡(luò)并不現(xiàn)實(shí),因此將傳統(tǒng)IP網(wǎng)絡(luò)和OpenFlow網(wǎng)絡(luò)相結(jié)合的過渡網(wǎng)絡(luò)是一個可行的方案。但是現(xiàn)有的OpenFlow網(wǎng)絡(luò)的拓?fù)浒l(fā)現(xiàn)和路由機(jī)制本質(zhì)上使用的都是二層技術(shù),不能很好的融合三層的路由協(xié)議,也就不能與傳統(tǒng)IP核心網(wǎng)絡(luò)直接連接通信,限制了網(wǎng)絡(luò)的可擴(kuò)展性,因此提出一種過渡網(wǎng)絡(luò)路由機(jī)制是十分有必要的。 本文對上述問題進(jìn)行了深入研究,論文的主要貢獻(xiàn)如下： 1) OpenFlow網(wǎng)絡(luò)中控制器可以對網(wǎng)絡(luò)進(jìn)行集中式管理,基于這種特性,本文提出一種與業(yè)務(wù)屬性相關(guān)的擁塞路由管理機(jī)帶CMTA-OF (Congestion Routing Management Based on Traffic Attribution in OpenFlow),以實(shí)現(xiàn)更高效的擁塞管理。CMTA-OF機(jī)制利用控制器掌握全局網(wǎng)絡(luò)流量分布的優(yōu)勢,將數(shù)據(jù)流的業(yè)務(wù)屬性、網(wǎng)絡(luò)的流量分布和網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)相結(jié)合,在擁塞鏈路處,選擇一條或者多條轉(zhuǎn)移開銷最小的數(shù)據(jù)流從網(wǎng)絡(luò)入口進(jìn)行重路由。理論分析和實(shí)驗(yàn)表明,和傳統(tǒng)的擁塞分流策略以及現(xiàn)有的基于OpenFlow網(wǎng)絡(luò)的LABERIO (LoAd-BalancEd Routing wIth OpenFlow)機(jī)制相比,CMTA-OF既能夠有效的緩解網(wǎng)絡(luò)的擁塞狀況,保證用戶的服務(wù)質(zhì)量,同時還能夠提升網(wǎng)絡(luò)的吞吐量和資源利用率。 2)為了解決過渡網(wǎng)絡(luò)路由問題,本文提出了一種IP_LLDP (IP Link Layer Discovery Protocol)協(xié)議,該協(xié)議主要分為IP地址分配、全OFS(OpenFlow Switch)虛擬拓?fù)錁?gòu)造和地址替換策略三部分。IP_LLDP路由協(xié)議能夠?qū)崿F(xiàn)兩個OpenFlow交換機(jī)通過傳統(tǒng)IP網(wǎng)絡(luò)使用最短路徑通信,并且新提出的路由機(jī)制的運(yùn)行不會影響傳統(tǒng)IP網(wǎng)絡(luò)的正常通信,具有良好的可擴(kuò)展性和獨(dú)立性。最后我們在實(shí)驗(yàn)室搭建了簡單的OpenFlow網(wǎng)絡(luò)實(shí)驗(yàn)平臺,從拓?fù)錁?gòu)造,路徑計算,流表構(gòu)造等幾個方面對提出的過渡網(wǎng)絡(luò)路由機(jī)制進(jìn)行了實(shí)驗(yàn)驗(yàn)證。
[Abstract]:SDN (Software Defined Network) /OpenFlow network is a revolution in the current network architecture, its core idea is to separate the data forwarding and control level. Because of its good controllability and manageability, SDN/OpenFlow network has been more and more attention in the industry.SDN architecture can be divided into application layer, control layer and device layer. The controller layer and equipment layer respectively completed forwarding two function control management and network data packet, the application layer is the custom of some network applications of.OpenFlow network can be seen as a concrete realization of the idea of SDN network is mainly composed of.OpenFlow controller, OpenFlow switches and OpenFlow standard protocol is composed of three parts, signaling interaction controller and OpenFlow switch through the OpenFlow standard protocol.
The technical challenges faced by OpenFlow networks: (1) the routing congestion management problem, the traditional network congestion management scheme is the choice of data flow rerouting in congestion node near the disadvantages of such a scheme is not sufficient to use the network topology. The congestion node resources as the anchor for rerouting, in some cases, to select the optimal path and even unable to obtain the feasible path. In OpenFlow network, we can manage to use the advantage of global cyber source controller presents a more efficient routing network congestion management strategy; (2) the transition network routing problem, OpenFlow network is in the early stage of development, laying large-scale OpenFlow network is not realistic, so the combination of traditional transition network IP network and OpenFlow network is a feasible scheme. But the existing OpenFlow network topology discovery and routing mechanism in essence making It uses two layers of technology, it can not well integrate the three level routing protocol, and can not directly communicate with the traditional IP core network, which limits the scalability of the network. Therefore, it is necessary to propose a transition network routing mechanism.
This paper makes an in-depth study of the above problems, and the main contributions of this paper are as follows:
1) controller in a OpenFlow network for centralized management of the network, based on this characteristic, this paper proposes a routing congestion management machine and business related attributes with CMTA-OF (Congestion Routing Management Based on Traffic Attribution in OpenFlow.CMTA-OF), in order to achieve congestion management mechanism more efficient controller master flow distribution of global network advantage, business attribute data flow, combining the topology of the network traffic distribution and network congestion, in the link, select one or more transfer with minimum overhead data flow re routing from the network entrance. Theoretical analysis and experimental results show that with traditional congestion diversion strategy and based on the existing OpenFlow network LABERIO (LoAd-BalancEd Routing wIth OpenFlow) mechanism compared to CMTA-OF can effectively alleviate the network congestion, ensure user service Quality, and can also improve the network throughput and resource utilization.
2) in order to solve the transition network routing problem, this paper proposes a IP_LLDP (IP Link Layer Discovery Protocol) protocol, the protocol consists of IP address assignment, OFS (OpenFlow Switch) virtual topology and address replacement strategy three part of the.IP_LLDP routing protocol can achieve two OpenFlow switch using the shortest path through communication the traditional IP network, the operation will not affect the routing mechanism and proposed the normal communication of the traditional IP network, has good scalability and independence. Finally, we set up a simple OpenFlow network experimental platform in the laboratory, from the topological structure, flow path calculation, table structure and several other aspects of the transition network routing mechanism is proposed the experiment was carried out.

【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP393.02

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 吳建平;吳茜;徐恪;;下一代互聯(lián)網(wǎng)體系結(jié)構(gòu)基礎(chǔ)研究及探索[J];計算機(jī)學(xué)報;2008年09期

2 唐暉;林濤;范典;侯自強(qiáng);;開展后IP技術(shù)研究 發(fā)展互聯(lián)網(wǎng)下一代[J];中國科學(xué)院院刊;2010年01期

3 裴育杰;王洪波;程時端;;一種保證時延的關(guān)鍵流路由調(diào)整算法[J];軟件學(xué)報;2010年03期

，

本文編號：1693324