MPLS 的服务质量

随着网络流量的不断增加,网络的业务范围不断拓展,如IP Phone,IP Fax,可视电话等,各种实时与多媒体业务对数据传输提出了低时延,低抖动等更高的要求,传统的IP网络已经很难保证QoS,这已成为网络进一步发展的瓶颈。为此,IETF提出了IP网络中实现了QoS的2种模型;综合服务模型和差分服务模型,其中差分服务模型是发展方向。与此同时,对QoS具有有良好保证的MPLS技术也应运而生,面介绍了2种模型的基本概念之后,讨论了MPLS对QoS姝具体技术实现,诸如按照传统路由器的方式进行选路的拓扑驱动MPLS,为特定服务的IP包创建隧道的约束路由的MPLS。

The QoS of MPLS

With the increasement of network traffic and the expansion of network business scope,such as IP Phone,IP Fax,Video Phone and so on,low delay,low jitter and other requirements on data communication are set forth by real time and multimedia service.The Quality of Service(QoS) can hardly be guaranteed and the traditional IP network becomes the bottleneck,which hinders the further development of network.Therefore,IETF has developed two models to achieve the QoS in IP network:Int Serv and Diff Serv,the latter being the tendency of development.At the same time,the MPLS technologies that can well guarantee the QoS come into being.After the basic concepts of the models are introduced,some practical MPLS technologies in securing QoS are discussed.They are the Topology Driven MPLS for routing with traditional router mode,the CR LSP MPLS for creating channel in special service for IP packets,and so on.