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MPLS Virtual Private Networks (VPNs) in RFC-2547bis defines a mechanism by which service providers can use their IP backbones to provide VPN services to customers.
A VPN is a set of sites which share common routing information and whose connectivity is controlled by a collection of policies. RFC-2547bis VPNs are also known as BGP-MPLS VPNs because the Border Gateway Protocol (BGP) is used to distribute VPN routing information across the provider's backbone, and MPLS is used to establish virtual circuits to forward VPN traffic across the backbone to remote VPN sites.