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Versions: 00 01 02                                                      
Network Working Group                                       M. Boucadair
Internet-Draft                                              C. Jacquenet
Intended status: Standards Track                          France Telecom
Expires: April 22, 2010                                         D. Cheng
                                                                  Huawei
                                                                  Y. Lee
                                                                 Comcast
                                                        October 19, 2009


               Multi-Topology OSPFv3 for IPv4-mapped IPv6
                 draft-boucadair-ospf-v4v6-ospfv3-mt-00

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.  This document may contain material
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   This Internet-Draft will expire on April 22, 2010.

Copyright Notice




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Internet-Draft         IPv4-mapped IPv6 MT-OSPFv3           October 2009


   Copyright (c) 2009 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 in effect on the date of
   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

Abstract

   This memo defines two new Multi Topology Routing Identifiers (MT IDs)
   in OSPFv3 [RFC2740]).  These new MT-OSPFv3 [I-D.ietf-ospf-mt-ospfv3]
   topologies are meant to convey routing information which is
   restricted to IPv4-mapped IPv6 addresses
   [I-D.ietf-behave-address-format].  The ultimate goal of instantiating
   dedicated topologies for IPv4-mapped IPv6 is to isolate the native
   IPv6 routing table from the IPv4 and to prevent from being overloaded
   by IPv4-mapped one.  This isolation is motivated also from an
   operational perspective to enforce specific engineering policies for
   each topology.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].
























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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 4
   2.  Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   3.  Forwarding  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 7







































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1.  Introduction

   MT-OSPFv3 [I-D.ietf-ospf-mt-ospfv3] is a mechanism that has been
   specified to run various topologies based on several criteria such as
   isolating IPv6 routing from IPv4 one.  Distinct MT IDs (Multi
   topology Identifiers) are assigned by IANA (e.g., MT ID # 0 for IPv6
   routing topology, MT ID # 3 for IPv6 multicast topology, etc.).  MT
   ID # 5-#31 range is reserved for IETF consensus.  This document
   requests the assignment of two new MT IDs for the following usages:

   o  Unicast IPv4-mapped IPv6 topology;

   o  Multicast IPv4-mapped IPv6 topology.

   In the context of IPv4 address exhaustion and the IPv6-IPv4
   interconnection, numerous solutions are currently elaborated within
   IETF.  Both translation (e.g., [I-D.ietf-behave-v6v4-xlate-stateful]
   and [I-D.ietf-behave-v6v4-xlate]) and encapsulation (e.g.,
   [I-D.boucadair-dslite-interco-v4v6] and
   [I-D.boucadair-behave-ipv6-portrange]) based schemes are proposed to
   allow IPv6-IPv4 interconnection.  These solutions require injecting
   in intra-domain routing protocols routes to IPv4-mapped IPv6
   [I-D.ietf-behave-address-format] destinations.

   In order to prevent from polluting the native IPv6 routing table with
   IPv4-mapped IPv6 routes, this memo defines new MT IDs which are
   required for the activation of multiple topologies to isolate the
   native IPv6 routing table from the IPv4-mapped one.  This is also
   motivated for operational reasons and to ease the migration to full
   IPv6.  And as a result, the unicast IPv4-mapped IPv6 topology is used
   for calculating routes for unicast IPv4-mapped IPv6 packets, and the
   multicast IPv4-mapped IPv6 topology is for calculating routes for
   multicast IPv4-mapped IPv6 packets.

   As a reminder, [I-D.ietf-ospf-af-alt] specifies an alternative
   mechanism to maintain multiple topologies, and in particular, each
   topology is created by a separate OSPFv3 instance identified by a
   unique Instance ID.  Each instance maintains its own neighbour
   adjacencies, link state database and SPF computation.  Network
   administrators have to make their decisions based on local policies
   and preferences as which mechanism to deploy.  If MT-OSPFv3 mechanism
   [I-D.ietf-ospf-mt-ospfv3] is deployed in an OSPFv3 network as a
   preference for multiple topologies, the extensions as defined in this
   memo may be used to support unicast/multicast IPv4-mapped IPv6
   routing.






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2.  Procedure

   This document does not require any modification to the procedure
   specified in [I-D.ietf-ospf-mt-ospfv3].  Nevertheless, only routes to
   IPv4-mapped IPv6 prefixes MUST be instantiated within an IPv4-mapped
   IPv6 routing MT-OSPFv3.  Concretely, the IANA's prefix defined in
   [I-D.ietf-behave-address-format] MUST be supported by default.
   Service providers MAY choose a LIR prefix to build the IPv4-mapped
   IPv6 addresses.


3.  Forwarding

   Only incoming datagrams destined to IPv4-mapped IPv6 addresses are
   associated with the IPv4-mapped IPv6 unicast/multicast topology,
   respectively.  WKP and/or LIR prefix defined in
   [I-D.ietf-behave-address-format] MUST be configured in all
   participating nodes.


4.  IANA Considerations

   This document requests the following MT-OSPFv3 IDs:

   o  MT ID# for IPv4-mapped IPv6 unicast topology

   o  MT ID# for multicast IPv4-mapped IPv6 topology.


5.  Security Considerations

   This document does not introduce any security issue in addition to
   those defined in [RFC2740].


6.  Acknowledgements

   TBC


7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2740]  Coltun, R., Ferguson, D., and J. Moy, "OSPF for IPv6",



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              RFC 2740, December 1999.

7.2.  Informative References

   [I-D.boucadair-behave-ipv6-portrange]
              Boucadair, M., Levis, P., Grimault, J., Villefranque, A.,
              Kassi-Lahlou, M., Bajko, G., Lee, Y., and T. Melia,
              "Flexible IPv6 Migration Scenarios in the Context of IPv4
              Address Shortage",
              draft-boucadair-behave-ipv6-portrange-03 (work in
              progress), October 2009.

   [I-D.boucadair-dslite-interco-v4v6]
              Boucadair, M., Jacquenet, C., Grimault, J., Kassi-Lahlou,
              M., Levis, P., Cheng, D., and Y. Lee, "Deploying Dual-
              Stack lite in IPv6-only Network",
              draft-boucadair-dslite-interco-v4v6-02 (work in progress),
              October 2009.

   [I-D.ietf-behave-address-format]
              Huitema, C., Bao, C., Bagnulo, M., Boucadair, M., and X.
              Li, "IPv6 Addressing of IPv4/IPv6 Translators",
              draft-ietf-behave-address-format-00 (work in progress),
              August 2009.

   [I-D.ietf-behave-v6v4-xlate]
              Li, X., Bao, C., and F. Baker, "IP/ICMP Translation
              Algorithm", draft-ietf-behave-v6v4-xlate-01 (work in
              progress), September 2009.

   [I-D.ietf-behave-v6v4-xlate-stateful]
              Bagnulo, M., Matthews, P., and I. Beijnum, "NAT64: Network
              Address and Protocol Translation from IPv6 Clients to IPv4
              Servers", draft-ietf-behave-v6v4-xlate-stateful-02 (work
              in progress), October 2009.

   [I-D.ietf-ospf-af-alt]
              Lindem, A., Mirtorabi, S., Roy, A., Barnes, M., and R.
              Aggarwal, "Support of address families in OSPFv3",
              draft-ietf-ospf-af-alt-08 (work in progress), July 2009.

   [I-D.ietf-ospf-mt-ospfv3]
              Mirtorabi, S. and A. Roy, "Multi-topology routing in
              OSPFv3 (MT-OSPFv3)", draft-ietf-ospf-mt-ospfv3-03 (work in
              progress), July 2007.






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Authors' Addresses

   Mohamed Boucadair
   France Telecom
   3, Av Francois Chateau
   Rennes,   35000
   France

   Email: mohamed.boucadair@orange-ftgroup.com


   Christian Jacquenet
   France Telecom
   3, Av Francois Chateau
   Rennes,   35000
   France

   Email: christian.jacquenet@orange-ftgroup.com


   Dean Cheng
   Huawei
   USA

   Email: Chengd@huawei.com


   Yiu L. Lee
   Comcast
   USA

   Email: Yiu_Lee@Cable.Comcast.com



















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