【正文】 的。t meet the demand now, campus work needs to be planed and designed again. building of a multiservicebased and plex campus work system， its scale of investment is very large， needing for an effective means of pairs of campus work planning,design,and mathematical modeling approach is too plicated, through experience,the planning and designing method is not reliable and not suited to the growing work needs, using work simulation software to model the work model and simulation has bee an inevitable choice. The main task of this research is through OPNET simulation software , for China39。 本文的主要研究任務(wù)，是通過 OPNET仿真軟件，對(duì)我國(guó)一般大學(xué)校園網(wǎng)的 網(wǎng)絡(luò)結(jié)構(gòu)進(jìn)行建模，對(duì)關(guān)鍵參數(shù)進(jìn)行收集，分析，并在原有模型上添加網(wǎng)絡(luò)結(jié)點(diǎn)及應(yīng)用，再進(jìn)行仿真，分析，對(duì)比，找出可能影響校園網(wǎng)性能的主要因素?，F(xiàn)代化教學(xué)手段的普遍運(yùn)用也使多媒體業(yè) 務(wù)需求迅速增長(zhǎng)，需要入網(wǎng)的結(jié)點(diǎn)也迅速增加，因此校園網(wǎng)網(wǎng)絡(luò)的結(jié)構(gòu)更加復(fù)雜，對(duì)設(shè)備性能的要求也更高，鏈路速度更快。許多早期建成的校園網(wǎng)已經(jīng)不能滿足現(xiàn)在的需求，校園網(wǎng)需要重新規(guī)劃設(shè)計(jì)。 本文的研究對(duì)校園網(wǎng)的規(guī)劃、設(shè)計(jì)、網(wǎng)絡(luò)建模都具有一定的指導(dǎo)意義，可以提高網(wǎng)絡(luò)設(shè)計(jì)的科學(xué)性，縮短網(wǎng)絡(luò)設(shè)計(jì)周期，降低校園網(wǎng)網(wǎng)絡(luò)的投資風(fēng)險(xiǎn)。s general university work, the work structure for modeling, simulation of work behavior, the key parameters of the collection, analysis, and add in the original model of the work nodes and applications, and then simulation, analysis， parison, Find out the main factors that may affect the campus work performance. This study on the campus work planning, design, work modeling has certain guiding significance for work design can improve the scientific nature of the work places a short design cycle, reduce the investment risks of Campus Network. Having certain application value. Key words： OPNET； work simulation； campus work 廣西大學(xué)學(xué)士學(xué)位論文 基于 OPNET的校園網(wǎng)仿真 IV 目 錄 第一章 緒論 .................................................................................................. 1 ........................................................... 1 ................................................................... 2 ............................................................... 3 第二章 仿真軟件 OPNET ............................................................................. 4 OPNET仿真平臺(tái)簡(jiǎn)介 .............................................................. 4 OPNET仿真關(guān)鍵技術(shù) ............................................................. 5 三層建模機(jī)制 .............................................................. 5 離散事件仿真機(jī)制 ...................................................... 7 仿真調(diào)度機(jī)制 .............................................................. 7 OPNET仿真流程 ..................................................................... 8 第三章 校園網(wǎng)性能評(píng)價(jià)指標(biāo) ...................................................................... 9 校園網(wǎng)的性能評(píng)價(jià)指標(biāo) ......................................................... 9 響應(yīng)時(shí)間 ...................................................................... 9 網(wǎng)絡(luò)延遲 ...................................................................... 9 延遲變化 .................................................................... 10 吞吐量 ........................................................................ 10 鏈路使用率 .................................................................11 資源利用率 .................................................................11 丟包率 .........................................................................11 可靠性和可用性 .........................................................11 素 ................................................................. 12 第四章 校園網(wǎng)的網(wǎng)絡(luò)設(shè)計(jì) ........................................................................ 13 校園網(wǎng)的主要拓?fù)漕愋? ..................................................... 13 星型拓?fù)浣Y(jié)構(gòu) ............................................................ 13 樹型拓?fù)浣Y(jié)構(gòu) ............................................................ 13 總線拓?fù)浣Y(jié)構(gòu) ............................................................ 13 環(huán)型拓?fù)浣Y(jié)構(gòu) ............................................................ 14 廣西大學(xué)學(xué)士學(xué)位論文 基于 OPNET的校園網(wǎng)仿真 V 網(wǎng)狀型拓?fù)浣Y(jié)構(gòu) ........................................................ 14 校園網(wǎng)關(guān)鍵設(shè)備及主要技術(shù) ............................................. 14 ...................................................................... 14 主要技術(shù) .................................................................. 17 第五章 校園網(wǎng)建模及仿真分 析 ................................................................ 19 校園網(wǎng)的建模 ..................................................................... 19 需求分析 .................................................................... 19 網(wǎng)絡(luò)建模 .................................................................... 20 業(yè)務(wù)配置 .................................................................... 26 數(shù)據(jù)收集及仿真分析 ......................................................... 26 數(shù)據(jù)收集 .................................................................... 26 仿真及分析 ................................................................ 27 增加節(jié)點(diǎn)及業(yè)務(wù)后仿真分析 ............................................. 30 結(jié)束語 .......................................................................................................... 33 參考文獻(xiàn) ...................................................................................................... 34 致謝 .............................................................................................................. 36 廣西大學(xué)學(xué)士學(xué)位論文 基于 OPNET的校園網(wǎng)仿真 1 第一章 緒論 論文研究的背景及目的 隨著計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的發(fā)展，人們對(duì)網(wǎng)絡(luò)的需求也發(fā)生了變化，不再僅僅是傳輸文本信息還增加了更為豐富的語音、數(shù)據(jù)、圖像以及多媒體等業(yè)務(wù)需求，而且隨著網(wǎng)絡(luò)的使用越來越廣泛，用戶的數(shù)量也隨之增加，這必然給網(wǎng)絡(luò)原有設(shè)備帶來沖擊，因此需要對(duì)原有設(shè)備加以改造以適應(yīng)網(wǎng)絡(luò)需求的發(fā)展 [17]。在這種情況下，仿真就成了最佳可供選擇的測(cè)試、評(píng)估和驗(yàn)證手段之一。目前，世界上大 部分發(fā)達(dá)國(guó)家和部分發(fā)展中國(guó)家都建立了本國(guó)的校園網(wǎng)體系噶 1。校園網(wǎng)普遍存在節(jié)點(diǎn)少、帶寬低、業(yè)務(wù)簡(jiǎn)單、利用率不高、可靠性和安全性差都問題。 國(guó)內(nèi)外研究的現(xiàn)狀 在國(guó)外，網(wǎng)絡(luò)仿真技術(shù)的研究和應(yīng)用已經(jīng)有十多年的歷史。另一個(gè)原因是主流的網(wǎng)絡(luò)仿真軟件基本上產(chǎn)自美國(guó)，而其高端產(chǎn)品在 1998廣西大學(xué)學(xué)士學(xué)位論文 基于 OPNET的校園網(wǎng)仿真 3