MRTG是MultiRouter Traffic Grapher(多路由器流量图形)的简写，它是一种典型的基于SNMP协议的监视网络链路流量和主机资源的开放源代码的管理工具，它通过SNMP协议得到设备的流量信息，并直观地以包含PNG格式图形的HTML文档的方式显示流量信息。

MRTG主要有四个功能模块：SNMP模块、日志文件、RateUp模块、配置模块。

-MRTG is MultiRouter Traffic Grapher (Multi Router Traffic Grapher) is abbreviated, which is a typical SNMP protocol based on monitoring network traffic and host resources, links open source management tools, which received the device through the SNMP protocol traffic information, and intuitively to include the PNG format graphics display of the HTML document flow information.

MRTG four main function modules: SNMP module, the log file, RateUp module, configuration module.