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区分服务（Diff－Serv, Differentitated Services）结构是IETF工作组定义的一种更具扩展性地实现IP QoS的方法，是基于类的解决方案。先分析了传统的基于RSVP的QoS解决方案中存在的问题，然后分析了区分服务的业务流程，并对其相关技术进行了讨论。
Differentiated Services (Diff-Serv, Differentitated Services) structure is a more extensible approach to IP QoS defined by the IETF working group. It is a class-based solution. Firstly, it analyzes the problems existing in the traditional RSVP-based QoS solution, then analyzes the business process of differentiating services and discusses its related technologies.