METHOD AND DEVICE FOR CONNECTING TO VIRTUAL PRIVATE NETWORK ACROSS DOMAINS

Embodiments of the present invention disclose a method for connecting to a VPN across domains. The method includes: receiving, by a PE, a request message for connecting a VDC to a VPN sent by a DCG, determining an RD/RT list corresponding to a VPN User ID in the request message according to the User ID, so as to configure a VPN instance, determining a connection identity at a local end according to a connection identity at a DCG end of an AC in the request message, and binding a logical port in the connection identity at the local end with the VPN instance so that the VDC is connected to the VPN. Accordingly, the present invention further provides a PE and a DCG device for connecting to a VPN across domains. By implementing the method and device provided in the embodiments of the present invention, connection of a VDC to a VPN can be realized by exchanging inband signaling on the premise of Option A or Option D interconnection, thereby significantly improving the execution efficiency of connecting the VDC to the VPN.