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区分服务(Diffserv)中EF(Expedited Forwarding)流的最大问题是随着跳数的增多,每个信息流的突发段长度和延迟都呈指数增加。本文在分析这种问题产生原因的基础上,提出了一种新的对EF业务进行处理的路由结构。在此结构中,采用基于输入链路的EF流调度控制,避免了突发段不断增长、延迟不断增大的情况,提高了EF业务端到端的服务质量(QoS),同时这种结构只对EF类进行处理并不改变路由器的其他结构,而且不需要与网络的其他节点交换信息,不增加网络开销。
The biggest problem with EF (Expedited Forwarding) flows in Diffserv is that as the number of hops increases, the burst length and delay for each traffic increase exponentially. Based on the analysis of the causes of this problem, this paper proposes a new routing structure that deals with EF services. In this architecture, EF-link flow scheduling control is adopted to avoid the continual increase of burst length and delay delay, and improve the end-to-end quality of service (QoS) of EF service. At the same time, EF class processing does not change the other structure of the router, and does not need to exchange information with other nodes in the network, without increasing network overhead.