RFC 4364, BGP/MPLS IP Virtual Private Networks (VPNs), describes a method of providing a VPN service, which secures connections to the network, allowing more efficient service to remote users without compromising the security of firewalls. The Rosen draft specifies the protocols and procedures that must be implemented for a service provider to provide a unicast VPN. The draft extends that specification by describing the protocols and procedures that a service provider must implement to support multicast traffic in a VPN.
See the ‟Virtual Private Routed Network Service” section of the 7210 SAS-Mxp, S, Sx, T Services Guide for more information.