Enterprise virtual private network (VPN) to virtual private cloud (VPC) adhesion

According to the present invention, techniques are provided for adhering an existing virtual private network (VPN), such as a VPN based on MPLS, to a virtual private cloud (VPC) in a public cloud data center, for example, a virtual private network (VPN) based on MPLS. According to the present invention, the adhesion architecture can be implemented by configuring a virtual routing application (VRA) in a VPC (Virtual Private Network) and configuring the virtual routing application and a virtual routing application controller in an existing VPN (Virtual Private Network). For VPCs without VRA in the public cloud, traffic may be routed to VPCs with VRA by default. 提供了将现有虚拟专用网络(virtual private network，VPN)(如基于MPLS的VPN)与公有云数据中心中的虚拟私有云(virtual private cloud，VPC)进行粘连的技术。可以通过在VPC中配置虚拟路由应用(virtual routing application，VRA)以及在现有VPN中配置虚拟路由应用和虚拟路由应用控制器来实现粘连架构。对于公有云中没有VRA的VPC，流量可以默认路由到具有VRA的VPC。