Advertising IPv4 Network Layer Reachability Information with an IPv6 Next Hop
draft-litkowski-bess-rfc5549revision-00

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Last updated 2019-11-19
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BESS Working Group                                          S. Litkowski
Internet-Draft                                                S. Agrawal
Intended status: Standards Track                        K. Ananthamurthy
Expires: May 22, 2020                                              Cisco
                                                                K. Patel
                                                                  Arrcus
                                                       November 19, 2019

  Advertising IPv4 Network Layer Reachability Information with an IPv6
                                Next Hop
                draft-litkowski-bess-rfc5549revision-00

Abstract

   Multiprotocol BGP (MP-BGP) [RFC4760] specifies that the set of
   network-layer protocols to which the address carried in the Next Hop
   field may belong is determined by the Address Family Identifier (AFI)
   and the Subsequent Address Family Identifier (SAFI).  The current
   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 advertising 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 in order to determine which of
   the protocols the address actually belongs to, and a new BGP
   Capability allowing MP-BGP Peers to dynamically discover whether they
   can exchange IPv4 NLRI and VPN-IPv4 NLRI with an IPv6 Next Hop.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on May 22, 2020.

Litkowski, et al.         Expires May 22, 2020                  [Page 1]
Internet-Draft               rfc5549revision               November 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Extension of AFI/SAFI Definitions for the IPv4 Address Family   4
   4.  Use of BGP Capability Advertisement . . . . . . . . . . . . .   6
   5.  Operations  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Usage Examples  . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  IPv4 over IPv6 Core . . . . . . . . . . . . . . . . . . .   8
     6.2.  IPv4 VPN unicast over IPv6 Core . . . . . . . . . . . . .   9
     6.3.  IPv4 VPN multicast over IPv6 Core . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   Multiprotocol BGP (MP-BGP) [RFC4760] specifies that the set of
   network-layer protocols to which the address carried in the Next Hop
   field may belong is determined by the Address Family Identifier (AFI)
   and the Subsequent Address Family Identifier (SAFI).  A number of
   existing AFI/SAFIs allow the Next Hop address to belong to a
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