【正文】 提供最高的傳送級別。匯聚的含義在于路由器可以把 QoS 需求相近的各業(yè)務流看成一個大類 , 以減少調度算法所處理的隊列數(shù) 。 IntServ 盡管能提供 QoS 保證 , 但擴展性較差。 RSVP是單向的預留 , 適用于點到點以及點到多點的通信環(huán)境。它是一種定性的指標。流分類根據(jù) QoS 需求決定數(shù)據(jù)分組所屬的服務等級。 IntServ 集成業(yè)務體系結構 為了更好的滿足各種新出現(xiàn)的語音、視頻等數(shù)據(jù)流量大的新的服務類型的需要， IETF 于 1949 年成立了 Intserv 工作組，并制定了綜合服務的體系結構和參考框架。在網絡設備上使用的鏈路控制策略，如主 動對列管理 AQM 等。在數(shù)據(jù)包到達目的地之前，每個路由器或者交換機必須能根據(jù)業(yè)務流的 QoS 要求將數(shù)據(jù)流的數(shù)據(jù)分組恰當?shù)呐抨?，并采用適當?shù)恼{度策略給予相應的調度時間。數(shù)據(jù)包丟失主要是由網絡擁塞引起的。為了給用戶提供滿意的QoS，經常對傳輸帶寬和時延等相應的資源進行預留，以確保這些資源不被其他應用占用。當然今后還有很多的工作要做，當出現(xiàn)新的網絡使用方式時，新的 QoS問題也會相伴而出，預想今后一個時期 Inter 會有豐富多彩的應用相繼被開發(fā)，隨之 QoS 技術也期待取得長足的進步。這些實時的多媒體業(yè)務對網絡傳輸延遲、延時抖動等特效為敏感，傳輸狀況會在很大程度上受到網絡狀態(tài)的影響：同時，由于多媒體業(yè)務占去了大量的帶寬，在現(xiàn)有的網絡中保證其他關鍵業(yè)務得到可靠傳輸就顯得很困難?；诓呗缘?IP 網絡的 QoS 研究畢業(yè)設計 本科生畢業(yè)論文 題 目： 基于策略的 IP 網絡的 QoS 研究 基于策略的 IP 網絡的 QoS 研究畢業(yè)設計 摘 要 網絡服務質量技術為多媒體的應用提供了可靠的保證，近年來已成為網絡技術研究領域的一個熱點問題。 關鍵字 :網絡 服務 質 量 集成服務 區(qū)分服務 多協(xié)議標簽交換 基于策略的 IP 網絡的 QoS 研究畢業(yè)設計 Abstract Quality of Service provides a reliable guarantee for the application of multimedia, and bees a hot spot in the research of works recently. Two models about Differentiated Service and Multiprotocol Label Switching supply an available route to sesolve the question of IPQoS, the technique of traffic control based on Diffserv over MPLS is studied in this paper. Firstly ,the development of IP QoS architecture is briefly discussed, and three kinds of architectures: Intserv, Diffserv and MPLS are demonstrated respectively, then the difference of them is pared in expandability, robustness and QoS. In order to improve IP QoS, the architecture of Diffserv over MPLS is researched on the basis of three models, in addition, framework and implementation about it are discussed, and in contrast to the others, the advantages of Diffserv over MPLS are analyzed. Secondly, after deeply analyzing current algorithms, the paper concentrates on technique of traffic control which includes queue management and scheduling, a dynamic queue management algorithm is proposed to enhance their expansibility and robustness, and the DRR scheduling algorithm is also improved. Comparing with other existing algorithms, their benefit in latency, jitter and fairness are presented. Then, the simulating experiments about dynamic queue management algorithms are more robust and able to make more use of work resource. Finally, a summary of the QoS is discussed, and expectation is devised in some aspects about future tasks. Although many schemes 基于策略的 IP 網絡的 QoS 研究畢業(yè)設計 have been put forward to resolve QoS presently, the technique of traffic control based on Diffserv over MPLS is still in experimental phase, expansibility and robustness about it ought to improve frequently. Keywords ： Quality of Service Integrated Service Differentiated Service Multiprotocol Label Switching I 目 錄 第一章 緒 論 ....................................................................................................................... 1 引言 .............................................................................................................................1 QOS 技術現(xiàn)狀 ............................................................................................................1 研究意義 ....................................................................................................................2 第二章 QOS 概念 .................................................................................................................. 4 QOS 概述 .....................................................................................................................4 定義 .................................................................................................................. 4 QoS 的參數(shù) ...................................................................................................... 4 QoS 研究內容 ................................................................................................. 5 IP QOS 的體系結構 .................................................................................................6 IntServ 集成業(yè)務體系結構 ...................................................................... 6 IntServ 集成業(yè)務 體系結構 ...................................................................... 9 Intserv 與 DiffServ 的比較 ................................................................... 11 第三章 基于策略的 QOS 網絡管理 ............................................................................... 12 基于策略 的思想 .....................................................................................................12 基于策略的 QOS 網絡管理框架 ...........................................................................14 第四章 基于策略的 QOS 網絡管理的設計 .................................................................. 17 策略網絡管理的體系框 架 ...................................................................................17 策略管理工具 ..........................................................................................................18 策略庫 ...........................................................................