You are the lead IP/MPLS network designer of a service provider called XYZ. You are leading a design discussion regarding IPv6 implementation in the XYZ MPLS network, using MPLS 6PE/6VPE techniques. C

Native IPv6 multicast (using PIM for IPv6) is required as the foundational forwarding mechanism because 6PE/6VPE does not carry multicast traffic, making it a necessary baseline component for any IPv6 multicast architecture in the MPLS core.

MPLS 6PE/6VPE carries only IPv6 unicast prefixes over an IPv4/MPLS core and does not provide IPv6 multicast support by default, requiring entirely separate mechanisms for multicast.

An overlay model using Layer 2 MPLS tunnels can transport IPv6 multicast streams across the provider core by encapsulating them within pseudowires, providing a viable transport path independent of native multicast support in 6PE/6VPE.

PIM Dense Mode uses a flood-and-prune behavior that wastes bandwidth and is unsuitable for service provider environments, and it does not provide a complete or scalable IPv6 multicast solution when combined with 6PE/6VPE.

MVPN for IPv6 multicast extends the existing MVPN framework (NG-MVPN profiles with BGP extensions) to support IPv6 multicast VPN services, enabling IPv6 multicast delivery consistent with the existing IPv4 MVPN design already deployed by XYZ.