Now the shortcomings of traditional IP network are emerged. Experts have proposed many advanced technologies according to the limitation of current IP network. MPLS is one of the best tools, which can guarantee QoS and has good future.

• 针对目前IP网络的局限性，专家们提出了多种先进的技术，而多协议标记交换(MPLS)就是其中一种最优秀最有发展前景的保证网络QoS的工具。