【作者】 许伟；

【导师】 周建中；

【作者基本信息】 华中科技大学 ， 系统分析与集成， 2005， 硕士

【摘要】 随着网络规模的飞速发展,传统的尽力而为IP 网络已经不能满足日益增长的实时业务和多媒体业务对网络传输质量的要求。服务质量理论的提出为实时多媒体应用等对网络QoS 属性有特殊要求的网络应用提供了传输级的解决方案。针对多播组内具有不同接入属性或处理能力的终端接入系统,研究如何根据不同服务质量需求动态配置网络资源,对于网络的发展具有现实的应用价值。异质网络环境中支持视频分层多播系统的QoS 分层过滤模型系统的设计及其实现是论文的研究重点。通过分析Linux 下的QoS 流量控制技术,利用Linux QoS 保证机制,实现了基于Redhat 9.0 的QoS 过滤模型路由系统。该系统主要由RSVP 模块和QoS-Filter 模块组成。RSVP 守护进程通过扩展的API 接口与QF 过滤程序交互RSVP扩展对象(RSVP_QF),QF 过滤程序解析RSVP_QF 对象中的服务级别和流量参数,并通过流量控制接口实现分层数据流的动态过滤。首先通过介绍服务质量的基本理论和研究现状,明确了本文研究的必要性; 研究了Linux 下多播路由的实现和流量控制机制的原理是研究工作实现的基础; 然后深入分析RSVP 资源预留协议的工作机制,并通过OPNET 下协议设计实现与模型仿真证实RSVP协议设计的有效性和稳健性; 详细阐述了QoS-Filter 系统的设计方案与实现过程,首先介绍了系统中主要的功能模块,然后,从数据结构,实现细节,实现流程图几个方面对QoS 分级过滤模型系统做了详细分析; 第五章介绍了QoS-Filter 模型系统的测试方案,分析了测试结果; 第六章总结了全文的工作,提出了系统可能的进一步改进,展望了QoS-Filter 模型系统的应用发展前景。更多还原

【Abstract】 As the rapid development of computer network, the traditional best-effort IP network is unable to meet the ever-increasing needs which imposed on network quality of service by real-time and multimedia traffic. The proposal of quality of service theory provides a transmission-level approach for those network applications which has particular requirement on the properties of QoS such as real-time multimedia application. Aiming at the various connect attributes and terminal systems with different processing capacity, the main research is about how to configure the network resources dynamically according to the diversified QoS requirment which has application value on the development of network. The paper gives weight on the design and implementation of QoS grading-filter modeling system which supports Video Layered Multicast System in heterogeneous network environment. Through analyzing the traffic control technology in Linux operating system, it actualizes the QoS-filter modeling Router system based on Redhat 9.0 by Linux’s QoS assurance mechanism. The system is mainly composed by RSVP module and QoS-Filter module. RSVP daemon process communicates QoS_Filter program with the RSVP extended object (RSVP_QF) through the extended API interface. Qos_Filter program parses the service level and flow parameter in RSVP_QF object and realizes the dynamic filter of Layered data flow via traffic control interface. Chapter one introduces the basic theory and current research of QoS,and points out the necessity of research mentioned in the paper. Chapter two details the basic principle of Linux QoS assurance mechanism. Chapter three deals with the working mechanism of RSVP at first and then proves the validity and solidity by protocol realization and parameter simulation under the environment of OPNET. Chapter four expounds the details in actualizing the QoS-Filter System. First of all, it introduces the main function modules of the system. Afterwards it analyzes the QoS grading-filter modeling system from the aspect of data structure, implementing detail and flow. Chapter 5 proposes the testing scheme of QoS-Filter modeling system, and analyzes the test results. Chapter six makes the summary, points out the possible improvement and gains a perspective on the application of QoS-Filter modeling system.更多还原