The Multiprotocol Label Switching(MPLS) is a new network technology that is quickly growing up,while Virtual Private Network,the greatest service field,is facing the challenge raised by the explosive increase of traffic in the network.

• 多协议标签交换MPLS(Multi ProtocolLabelSwitching)是一新兴的网络技术 ,不断趋于成熟 ; 而虚拟专用网VPN(VirtualPrivateNetwork)作为一个最大的服务领域 ,正面临网络业务量爆炸性增长所带来的挑战。