Abstract: A common BGP framework is provided to achieve VPN information discovery in network based VPNs using modifications to existing BGP-4 multiprotocol extension path attributes. The framework allow each VPN to implement different OSI layer-2 or layer-3 protocols, and to implement different OSI layer-2 or layer-3 protocols from those used by the backbone of the shared network. The extensions added to BGP-4 apply both to Virtual Router (VR) models of VPN systems and to non-VR models.

Abstract: A virtual private network enables private communications over a shared MPLS network between two or more private networks. The virtual private networks include a first router connected to the shared MPLS network and configured to dynamically distribute first router VPN information across the shared MPLS network. The first router VPN information includes a VPN identifier which is assigned to the first router. The VPN also includes a second router connected to the shared MPLS network and and configured to dynamically distribute second router VPN information across the shared MPLS network. The second router VPN information includes a VPN identifier which is assigned to the second router and which is identical to the VPN identifier assigned to the first router. The first and second routers are also configured to establish label switched paths therebetween.