DiffServ model is one important model of the IP QoS, this model works on the basis of packet classification granularity , so it can overcome the limitation of the IntServ/RSVP model and it is easy to be realized on the big networks.

• DiffServ模型是当前实现IP QoS的主要模型之一，这一模型工作在分组类的粒度上，克服了IntServ/RSVP模型在分组流粒度工作上的缺陷，因而容易在大规模网络上实现。