PIM Encoding and Procedures for Unicast IPv4 prefixes with IPv6 next-hop

Multi-Protocol BGP (MP-BGP) has support for distributing next-hop information for multiple address families using one AFI/SAFI Network Layer Reachability Information (NLRI). [RFC5549] specifies the extensions necessary to allow advertising IPv4 NLRI or VPN-IPv4 NLRI with a Next Hop address that belongs to the IPv6 protocol. While the next-hop info is learnt via MP-BGP, certain procedures are needed to enable traffic forwarding. This document describes PIM extensions and the use-cases for multicast forwarding in various scenarios.