本文主要针对的是MPLS VPN网络,MPLS VPN对于PE设备性能的需求是完全一致的,网络一个PE存在性能、扩展性问题时,就会影响整个网络的性能及可扩展性。本文所提出的分层网络模型就是为了解决以上提及的可扩展性问题,VPN所涉及的也不再是以往简单的平面模型了。分层次的VPN(即Hierarchy of VPN,简称HoVPN),为了完成一共PE的功能,把PE的功能分配到不同的PE设备上,这样就有多个PE承担着不同的作用,这种方案的提出为VPN网络的发展提供了一种有效的解决方案。 This article is mainly aimed at the MPLS VPN network. The requirements of the MPLS VPN for the performance of the PE devices are exactly the same. When a PE in the network has performance or scalability problems, it affects the performance and scalability of the entire network. The layered network model proposed in this paper is to solve the scalability problems mentioned above, and the VPN involved is no longer a simple planar model in the past. Hierarchy of VPN (Hierarchy of VPN, referred to as HoVPN), in order to achieve a total of PE functions, the PE functions assigned to different PE devices, so there are multiple PE to play a different role, this program is proposed VPN network for the development of an effective solution.