RFC 4364, BGP/MPLS IP Virtual Private Networks (VPNs), describes a method of providing a VPN service. A VPN provides secure 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 which 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, assuming that PIM [PIMv2] is the multicast routing protocol used within the VPN, and the SP network can provide PIM.
IGMP is not supported for receivers or senders directly attached to the PE.
For more information, see the ‟Virtual Private Routed Network Service” section of the 7450 ESS, 7750 SR, 7950 XRS, and VSR Layer 3 Services Guide: IES and VPRN.