This solution allows delivery of IPv6 multicast traffic in an IP-VRF using an IPv4 multicast in the underlay network. The protocol used to build multicast trees in the underlay network is PIM Sparse Mode.

In networks where source and destination of multicast traffic all reside in the same VLAN, IPv6 multicast traffic is flooded to all ports in the VLAN by default. MLD snooping can be enabled to optimize the inefficient transmission, pruning out ports with no receivers.

This solution optimizes the delivery of multicast to a VLAN over an Ethernet VPN (EVPN) network. Without this solution IPv6 multicast traffic in a VLAN is flooded to all Provider Edge(PE) devices which contain the VLAN.