Advertising IPv4 Network Layer Reachability Information (NLRI) with an IPv6 Next Hop
RFC 8950

Received changes through RFC Editor sync (created alias RFC 8950, changed title to 'Advertising IPv4 Network Layer Reachability Information (NLRI) with an IPv6 Next Hop', changed abstract to 'Multiprotocol BGP (MP-BGP) specifies that the set of usable next-hop address families is determined by the Address Family Identifier (AFI) and the Subsequent Address Family Identifier (SAFI). The AFI/SAFI definitions for the IPv4 address family only have provisions for advertising a next-hop address that belongs to the IPv4 protocol when advertising IPv4 Network Layer Reachability Information (NLRI) or VPN-IPv4 NLRI.

This document specifies the extensions necessary to allow the advertising of IPv4 NLRI or VPN-IPv4 NLRI with a next-hop address that belongs to the IPv6 protocol. This comprises an extension of the AFI/SAFI definitions to allow the address of the next hop for IPv4 NLRI or VPN-IPv4 NLRI to also belong to the IPv6 protocol, the encoding of the next hop to determine which of the protocols the address actually belongs to, and a BGP Capability allowing MP-BGP peers to dynamically discover whether they can exchange IPv4 NLRI and VPN-IPv4 NLRI with an IPv6 next hop. This document obsoletes RFC 5549.', changed pages to 12, changed standardization level to Proposed Standard, changed state to RFC, added RFC published event at 2020-11-19, changed IESG state to RFC Published, created obsoletes relation between draft-ietf-bess-rfc5549revision and RFC 5549)