当前互联网环境中,虚拟网专用技术(VPN)与虚拟网络映射技术存在类似的方面,它们均是共享底层网络资源。同时,结合约束条件来构建虚拟网络专用网。但是构建VPN网络时,只考虑了底层链路资源约束条件。而虚拟网络映射技术将请求约束条件、底层节点资源和链路资源约束条件等因素考虑在内,来构建匹配的虚拟网络专用网。这能克服VPN技术带来的专网专用问题,最大化底层网络资源共享优势。本文对底层网络存在的一些问题进行了分析,如物理网络固 In the current Internet environment, there are similarities between Virtual Private Network (VPN) technology and virtual network mapping technology, all sharing the underlying network resources. At the same time, the virtual private network is constructed based on the constraints. However, only the underlying link resource constraints are considered when building the VPN network. The virtual network mapping technology will request constraints, the underlying node resources and link resource constraints and other factors to take into account to build a matching virtual private network. This can overcome the private network VPN technology issues, to maximize the advantages of the underlying network resource sharing. In this paper, some problems of the underlying network are analyzed, such as the physical network