基于P2P的内容分发网络体系结构及路由研究

【作者】 邓江；

【导师】 孙世新；

【作者基本信息】 电子科技大学 ， 计算机应用技术， 2007， 硕士

【摘要】 P2P和内容分发网络(Content Delivery Network,CDN)技术是当前互联网上实现内容传递的两种主流技术。内容分发网络的核心是将互联网内容提供商(Internet Content Provider,ICP)和电子商务应用站点的信息迅速有效地发布到离用户最近的服务节点上,使用户访问站点时可以就近得到快速响应,同时减轻原站点的负荷,提高设备和网络利用率。P2P则采用一种完全不同的内容传递方式。P2P的核心是利用用户资源,通过对等方式进行文件传输,这完全不同于传统的客户/服务器计算模型。P2P通过“去中心化”的设计和多点传输机制,实现了不依赖服务器而快速的交换文件。由于CDN的可靠性、可管理性和P2P的扩展能力互为补充,目前,如何将两者进行有效地结合逐渐成为网络研究的热点之一。本文主要内容如下:1.对CDN和P2P关键技术分别进行了深入细致的分析、研究;2.提出一种新型的网络拓扑结构——基于P2P的内容分发网络系统结构;3.根据基于P2P的内容分发网络系统结构构建相应的动态路由算法:系统内路由算法和代理服务器路由算法。前者将主要考虑自治系统内的高度动态性,是一种新型的动态结构化扩散式路由选择算法;而后者将更多的考虑QoS问题,即如何在稳定的源服务器及代理服务器之间高效的寻找路由机制。4.对各算法进行相应的仿真。更多还原

【Abstract】 P2P and CDN (Content Delivery Network) are two main ways of delivering contents on the Internet. The kernel of CDN is to deliver contents of ICP and e-commerce sites to service nodes which are close to users quickly and efficiently. Thanks to the help of CDN, users can visit the nearest service nodes with prompt response. Furthermore, CDN reduces the burden of original sites and improves the utilization of equipments and networks.Compared to CDN, P2P is a completely different way of delivering contents. The kernel of P2P is to make use of users’resources to deliver contents in the way of "peer to peer". This is totally different from the traditional C/S model. P2P is designed to be "no center" and exchange conterts among multi-peers without servers.The reliability and manageability of CDN and the scalability of P2P are supplementing each other, so how to integrate CDN and P2P effectively has become one of the hotspots of network research. The main contents of the dissertation are as follows:1.To analyze technologies which have relationship with CDN and P2P in depth;2.A new prototype of network which is called P2P-based content delivery network is proposed;3.Dynamic routing algorithms are carried out on the basis of the P2P-based content delivery network. One is called Dynamic-inner Routing algorithm and the other is called Proxy Routing algorithm. The Dynamic-inner Routing algorithm mainly considers the highly dynamic changes in an autonomous system; it’s a configurable and diffused routing algorithm. QoS is largely considered in the Proxy Routing algorithm, it means that what matters mostly is that how to find an efficient routing mechanism between source servers and proxy servers.4.All algorithms in the dissertation are simulated in appropriate ways.更多还原