铁路数据网MPLS DiffServ模型的应用分析  

Application Analysis of MPLS DiffServ Model in Railway Data Network

作　　者：牛新春 Niu Xinchun(Shanghai Communication Division,China Railway Shanghai Group Co.,Ltd,Shanghai 200080,China)

机构地区：[1]中国铁路上海局集团有限公司上海通信段,上海200080

出　　处：《铁路通信信号工程技术》2020年第8期47-52,61,共7页Railway Signalling & Communication Engineering

摘　　要：MPLS差分服务(MPLS DiffServ)模型有3种工作模式,分别是Uniform、Pipe和Short Pipe。目前铁路数据网MPLS DiffServ模型采用的是Uniform模式。通过图例说明3种模式下数据报文在纯IP流量网络和MPLS流量网络中QoS优先级的映射过程,通过配置案例分析Uniform模式和Pipe模式在铁路数据网上的应用,以及数据在PE(网络侧边缘设备)上内部优先级PHB行为与IPDSCP和MPLS标签EXP值的映射,对比得出Pipe模式在铁路数据网中配置简单,易于维护。同时通过端口镜像技术来抓取数据包,验证数据的准确性。There are three working modes in MPLS DiffServ(MPLS differential Services model),which are Uniform,Pipe,and Short pipe.At present,the MPLS DiffServ model of railway data network adopts Uniform mode.This paper illustrates the mapping process of QoS priority of Datagram in pure IP traffic network and MPLS traffic network under three modes,and analyzes the application of Uniform mode and Pipe mode in railway data network through configuration case.As well as the mapping of the internal priority PHB behavior of the data on the PE(network side edge equipment) with the IP DSCP and MPLS tag EXP values,it is concluded that the Pipe mode in the railway data network is simple to configure and easy to maintain.At the same time,the port mirroring technology is used to capture the data packets to verify the accuracy of the data.

关 键 词：铁路数据网 MPLS DiffServ Uniform模式 Pipe模式 端口镜像 

分 类 号：U285.4[交通运输工程—交通信息工程及控制]