电力数据通信网端到端网络主动测量系统的设计与实现

随着湖南电力数据通信网的迅速发展,端到端的网络测量方法对于网络运维越来越显重要。传统基于SNMP和NETFLOW的被动测量手段不能获得与用户体验密切相关的重要网络参数如可用带宽、HTTP首页下载时间、POP3邮件接收响应时间等。大规模网络主动测量系统在国外有不少应用,在国内尚无较大规模应用的案例。为了提高湖南电力数据通信网整体运维水平,实现端到端的网络测量技术,文中设计并实现了电力数据通信网端到端网络主动测量系统。文中对系统的体系结构、任务调度方法、探针设计、系统的部署方法等进行了详细论述。该系统的实际测量结果表明,该系统可以提供准确和有效的测量结果,测量结果对网络优化和网络改造具有重要的参考价值。

网络瓶颈带宽测量的噪声分析

包对/串技术通过两个/多个背靠背发送的测量包所经历的散布间隔来估测一条路径的瓶颈带宽.本文分析了瓶颈带宽测量中的噪声特性,解释了在不同测量包长和测量包数情况下测量样点的分布.基于噪声分析的结论,文中提出了一种基于信号模式的滤波算法(MBFA,Model-Based Filtering Algorithm),它利用信号模式/特征来增强信号、过滤噪声.

基于SiP技术的网络测量探针芯片集成设计

为了使主动网络测量探针国产化、小型化,通过分析目前CAIDA主推的最新主动探测终端工具群岛结构(Archipelago Measurement Infra-Structure,Ark)的硬件参数,并结合现有国产化裸芯片,设计了一种基于微系统技术的探针用主控系统级封装(System in Package,SiP)芯片。该探针主控SiP采用国产处理器搭配现场可编程门阵列(Field Programmable Gate Array,FGPA)的架构,集成双倍数据速率(Double Data Rate,DDR)内存颗粒和Flash等裸芯片,并选配了国产网络物理层芯片。设计完成的SiP芯片总体尺寸仅为30 mm×30 mm,最高主频为1 GHz,内存为2 GB,网口扩展为千兆。采用该探针芯片的系统从芯片选型到软件实现均采用全国产化设计,应用于国内网络测量场合时安全、保密性更高。

Design and Implementation of a Network Management System Based on Mobile RMON Agent

To improve the scalability of RMON-based network management, the concept of Mobile RMON Agent (MRA) was presented by combining the mobile agent technology with RMON. Then an MRA-based Network Management System (MRANMS) was designed and implemented. RMON functions were achieved by programming the mobile agent to make it capture and analyze packets locally. The experimental result on the Grasshopper platform indicates that MRA as a mobile agent can migrate to another subnet and calculate a RMON MIB value and TrafficMatrix in a subnet with 29 hosts. Furthermore, the behavior of MRA can be customized to achieve new RMON functions, such as the statistics of hostTable in RMON MIB. It can be concluded that MRANMS is based on the mode of distribution, and besides the compatibility with standard RMON, the system possesses scalability of management function.