Go morning,
Go this Request For Comment:
his document describes a method by which a Service Provider with an IP backbone may provide VPNs (Virtual Private Networks) for its customers. MPLS (Multiprotocol Label Switching) is used for forwarding packets over the backbone, and BGP (Border Gateway Protocol) is used for distributing routes over the backbone. The primary goal of this method is to support the outsourcing of IP backbone services for enterprise networks. It does so in a manner which is simple for the enterprise, while still scalable and flexible for the Service Provider, and while allowing the Service Provider to
add value. These techniques can also be used to provide a VPN which itself provides IP service to customers.
Regards
Fred Sweezer Sr.
http://www.faqs.org/rfcs/rfc2547.html
