【摘要】：作為云計算的核心基礎設施,數(shù)據(jù)中心網(wǎng)絡是一個連接了數(shù)萬級、十萬級甚至百萬級的大規(guī)模服務器群來進行大型分布式計算的橋梁,因此更成為了互聯(lián)網(wǎng)研究熱點中的熱點。隨著網(wǎng)絡規(guī)模的膨脹,數(shù)據(jù)中心所需處理的數(shù)據(jù)信息也隨之呈現(xiàn)出爆炸式的增長趨勢,建設管理復雜、控制不靈活等問題也愈加明顯,進而影響了數(shù)據(jù)中心網(wǎng)絡的進一步發(fā)展。而通過利用軟件定義網(wǎng)絡(Software Defined Networking,SDN)技術(shù)來搭建數(shù)據(jù)中心,不僅可以簡化數(shù)據(jù)中心的網(wǎng)絡管理,而且還能優(yōu)化其網(wǎng)絡性能,進一步提高數(shù)據(jù)中心的業(yè)務承載能力,因而受到了工業(yè)界和學術(shù)界的廣泛重視。本文首先對數(shù)據(jù)中心網(wǎng)絡、軟件定義網(wǎng)絡以及當前數(shù)據(jù)中心網(wǎng)絡的SDN技術(shù)應用方案進行了細致的研究,并重點研究了 SDN實現(xiàn)的關鍵技術(shù)Openflow及其網(wǎng)絡數(shù)據(jù)報文的轉(zhuǎn)發(fā)機制,同時分析了現(xiàn)有基于TCAM(Ternary Content Addressable Memory,三態(tài)內(nèi)容尋址存儲器)實現(xiàn)的Openflow流表轉(zhuǎn)發(fā)策略,在研究過程中我們發(fā)現(xiàn)Openflow在實際的應用中仍然存在著一些技術(shù)瓶頸,例如:路由器/交換機中廣為使用的快速查找TCAM存儲器成本的問題以及內(nèi)存問題。為此本文提出了 CMDDBF(Combined Multi-Dimension Dynamic Bloom Filter,聯(lián)合多維動態(tài)Bloom過濾器)查找結(jié)構(gòu)來替代Openflow交換機中的TCAM實現(xiàn)流表的轉(zhuǎn)發(fā)和處理。CMDDBF解決了 TCAM空間利用率低和價格昂貴的缺點,能夠有效實現(xiàn)多字段數(shù)據(jù)的查找和處理操作,并根據(jù)流表的規(guī)模動態(tài)的調(diào)整內(nèi)存空間。CMDDBF具有良好的靈活性和可擴展性,更適用于Openflow交換機流表的查找和處理操作。通過實驗分析,CMDDBF在降低誤識率方面具有很好的性能。。
[Abstract]:As the core infrastructure of cloud computing, data center network is a bridge that connects tens of thousands, 100,000 or even millions of large-scale server clusters to carry out large-scale distributed computing, so it has become a hot spot in Internet research. With the expansion of the network scale, the data information that the data center needs to deal with also presents the explosive growth trend, the construction management is complex, the control is inflexible and so on, has affected the further development of the data center network. By using software definition network (Software Defined Networking,SDN) technology to build data center, not only the network management of data center can be simplified, but also its network performance can be optimized, and the service carrying capacity of data center can be further improved. As a result, the industry and academia have been widely valued. In this paper, the application scheme of SDN technology in data center network, software definition network and current data center network is studied in detail, and the key technology of SDN realization, Openflow and the forwarding mechanism of network data message, are studied in detail in this paper. At the same time, the Openflow stream table forwarding strategy based on TCAM (Ternary Content Addressable Memory, three-state content addressable memory is analyzed. In the process of research, we find that there are still some technical bottlenecks in the practical application of Openflow. For example, the cost of fast lookup of TCAM memory and memory problem in routers / switches. In this paper, CMDDBF (Combined Multi-Dimension Dynamic Bloom Filter, combined with multidimensional dynamic Bloom filter is proposed to replace TCAM in Openflow switch to realize stream table forwarding and processing. CMDDBF solves the disadvantages of low TCAM space utilization and high price. CMDDBF has good flexibility and extensibility, and it is more suitable for the search and processing of flow table in Openflow switch. Through experimental analysis, CMDDBF has good performance in reducing error rate.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP308

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