传统的尽力而为的转发机制由于Internet的飞速发展,已经不能满足用户的要求。为此,对区分业务方案的具体系结构及实现环节作了详细的介绍,并讨论了其在IP城域网的实施。与其它机制相比,区分业务实现简单、系统开销少,能在骨干网中有效地保证服务质量。 Due to the rapid development of the Internet, the traditional best-effort forwarding mechanism can no longer meet user requirements. To this end, the division of the business architecture and implementation of the specific system made a detailed introduction, and discussed its implementation in the IP MAN. Compared with other mechanisms, differentiated services are easy to implement and have less system overhead, so they can effectively guarantee service quality in the backbone network.