OSPFv3 over IPv4 for IPv6 Transition
RFC 7949

Document Type RFC - Proposed Standard (August 2016; No errata)
Updates RFC 5838
Last updated 2016-08-10
Replaces draft-chen-ospf-transition-to-ospfv3
Stream IETF
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IESG IESG state RFC 7949 (Proposed Standard)
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Send notices to "wenhu.lu@gmail.com" <wenhu.lu@gmail.com>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                           I. Chen
Request for Comments: 7949                                      Ericsson
Updates: 5838                                                  A. Lindem
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                              R. Atkinson
                                                              Consultant
                                                             August 2016

                  OSPFv3 over IPv4 for IPv6 Transition

Abstract

   This document defines a mechanism to use IPv4 to transport OSPFv3
   packets.  Using OSPFv3 over IPv4 with the existing OSPFv3 Address
   Family extension can simplify transition from an OSPFv2 IPv4-only
   routing domain to an OSPFv3 dual-stack routing domain.  This document
   updates RFC 5838 to support virtual links in the IPv4 unicast address
   family when using OSPFv3 over IPv4.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7949.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Chen, et al.                 Standards Track                    [Page 1]
RFC 7949          OSPFv3 over IPv4 for IPv6 Transition       August 2016

Table of Contents

   1. Introduction ....................................................2
      1.1. IPv4-Only Use Case .........................................3
   2. Requirements Language ...........................................4
   3. Encapsulation in IPv4 ...........................................4
      3.1. Source Address .............................................6
      3.2. Destination Address ........................................6
      3.3. OSPFv3 Header Checksum .....................................6
      3.4. Operation over Virtual Links ...............................7
   4. Management Considerations .......................................7
      4.1. Coexistence with OSPFv2 ....................................7
   5. Security Considerations .........................................8
   6. References ......................................................8
      6.1. Normative References .......................................8
      6.2. Informative References .....................................9
   Acknowledgments ...................................................10
   Authors' Addresses ................................................11

1.  Introduction

   Using OSPFv3 [RFC5340] over IPv4 [RFC791] with the existing OSPFv3
   address family extension can simplify transition from an IPv4-only
   routing domain to an IPv6 [RFC2460] or dual-stack routing domain.
   Dual-stack routing protocols, such as the Border Gateway Protocol
   [RFC4271], have an advantage during the transition, because both IPv4
   and IPv6 address families can be advertised using either IPv4 or IPv6
   transport.  Some IPv4-specific and IPv6-specific routing protocols
   share enough similarities in their protocol packet formats and
   protocol signaling that it is trivial to deploy an initial IPv6
   routing domain by transporting the routing protocol over IPv4,
   thereby allowing IPv6 routing domains to be deployed and tested
   before decommissioning IPv4 and moving to an IPv6-only network.

   In the case of the Open Shortest Path First (OSPF) interior gateway
   routing protocol (IGP), OSPFv2 [RFC2328] is the IGP deployed over
   IPv4, while OSPFv3 [RFC5340] is the IGP deployed over IPv6.  OSPFv3
   further supports multiple address families [RFC5838], including both
   the IPv6 unicast address family and the IPv4 unicast address family.
   Consequently, it is possible to deploy OSPFv3 over IPv4 without any
   changes to either OSPFv3 or IPv4.  During the transition to IPv6,
   future OSPF extensions can focus on OSPFv3, and OSPFv2 can move to
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