一种面向网络管理的接入网测度模型  

A Metric Model for Access Network Management

作　　者：杨艳[1] 丁伟[1] 程光[1] 龚俭[1] 

机构地区：[1]东南大学计算机科学与工程学院,南京210096

出　　处：《计算机科学》2008年第5期87-91,共5页Computer Science

基　　金：国家973重点基础研究发展规划项目基金(2003CB314804)资助

摘　　要：网络测度是网络测量的基础,对于网络行为学的研究具有重要的意义。TCP层的测度和IP层的测度各有优劣,将这两者的优点结合起来是一项很有意义的课题。本文以IP报文传递方向为背景,分别提出了面向TCP连接和面向IP接入网的报文平衡测度。通过对TCP协议机制的分析,给出了前者取值范围的计算公式并讨论了将其映射到后者的方法,从而将这两种测度的优点结合起来。借鉴医学测度研究的方法,我们给出了后者"健康"范围的参考取值区间,并进一步讨论了测度计算的时间粒度的选取问题,使其成为一个可以实时衡量网络运行健康状况的实用指标,从而建立起一个完整的模型,可以直接应用于实际的接入网络管理。Network metric is the foundation of network measurement and plays a significant role in the research of net-work behavior. Both TCP layer oriented metrics and IP layer oriented metrics have advantages and disadvantages. Therefore, to take advantage of both is a meaningful subject. This paper gives quantitative balance metrics of bidirectional packets for both TCP connection and IP access network based on the direction of packet delivery. By the analysis of TCP protocol specification, the formula to calculate the former is presented and how to map the former to the latter is discussed. Then the ＂helth＂ range of the quantitative balance metric for access network is given based on real trace and by referring to the method in the research of medical metrics, as well. In addtion, the selection of time bin to calcu- late the metric is also discussed ,thus makes it a utility index to evaluate the running state of the network. So, a complete model is established which can be applied directly to access network management.

关 键 词：接入网 报文平衡测度 网络管理 

分 类 号：TP393.07[自动化与计算机技术—计算机应用技术] TN915.6[自动化与计算机技术—计算机科学与技术]