区分服务中的分组标记策略研究

Packet Marking Algorithm Research in Differentiated Service Networks

区分服务是近两年的一个研究热点 ,其目的是为用户提供较大粒度的服务质量 (Qo S)保证 .与集成服务模型相比 ,区分服务不仅具有良好的可扩展性 ,而且更容易在传统 IP分组交换网络上实现 .研究了区分服务的一个关键机制——分组标记策略 ,并提出了一个具有公平性的分组标记算法 (fair marking packet algorithm,简称FMPA) ,通过仿真把该算法与现有的等比例的标记算法进行比较 .此外 ,还提出了一种分组再标记 (remarking)算法 ,该算法可尽可能地维护分组原有的服务语义 .

Differentiated service (DiffServ) architecture has become one of the research hot spots on computer network in the last two years. Its intention is to provide quality of service for users at coarse granularity level. In contrast to integrated service architecture, DiffServ is not only more scalable, but also easier to be deployed in traditional packet-switching networks. In this paper, the packet-marking algorithm, one of the key mechanisms DiffServ is studied. A new packet-marking algorithm called FMPA (fair marking packet algorithm) is presented. The new algorithm is compared with the existing proportional packet-marking algorithm by simulation. In addition, a packet remarking algorithm is proposed. By using it, the packet's original semantic can be kept to the largest degree. The simulation result shows it in this paper.