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Versions: 00 01                                                         
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


                 IPv4-mapped IPv6 Instance IDs in IS-IS
                    draft-boucadair-isis-v4v6-mi-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
   from IETF Documents or IETF Contributions published or made publicly
   available before November 10, 2008.  The person(s) controlling the
   copyright in some of this material may not have granted the IETF
   Trust the right to allow modifications of such material outside the
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   This Internet-Draft will expire on April 22, 2010.

Copyright Notice




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Internet-Draft     IPv4 Mapped IPv6 IS-IS Instance ID       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 Instance Identifiers (Instance IDs) in
   IS-IS [RFC1195]).  These new Instance IDs [I-D.ietf-isis-mi] are
   meant to instantiate distinct IS-IS instances to convey routing
   information which is restricted to IPv4-mapped IPv6 addresses
   [I-D.ietf-behave-address-format].  The ultimate goal of running
   separate instances for IPv4-mapped IPv6 is to isolate the native IPv6
   routing table from the IPv4 and to prevent to be overloaded by IPv4-
   mapped one.  This isolation is motivated also from an operational
   perspective to allow specific engineering policies for each instance.

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   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  . . . . . . . . . . . . . . . . . . . . . . . . 6







































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1.  Introduction

   [I-D.ietf-isis-mi] specifies a mechanism to map each address family
   to a separate IS-IS [RFC1195] Instance identified by an ID.  Accepted
   ID values are 0 to 65535.  Instance ID#0 is used by default (legacy
   systems).  This document requests the assignment of two new MI-IS-IS
   Instance IDs for the following usages:

   o  Unicast IPv4-mapped IPv6 IS-IS routing instance;

   o  Multicast IPv4-mapped IPv6 IS-IS routing instance.

   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 Instance IDs which are required for the
   activation of several IS-IS instances for unicast/multicast IPv4-
   mapped IPv6.  This isolation is also motivated for operational
   reasons and to ease the migration to full IPv6.  As a result, when a
   separate IS-IS instance for unicast IPv4-mapped IPv6 address family
   is activated, there creates a separate IS-IS adjacency table based on
   which unicast IPv4-mapped IPv6 routing is calculated and performed,
   and similarly, when a separate IS-IS instance for multicast IPv4-
   mapped IPv6 address family is activated, there creates a separate
   IS-IS adjacency table for multicast IPv4-mapped IPv6 routing.

   In case [RFC5120] is deployed, new Multi Topology IDs are required to
   be defined.  As a reminder, [RFC5120] specifies an alternative
   mechanism to maintain multiple IS-IS topologies within the same IS-IS
   domain.  This memo does not make any preference between the solution
   described in [RFC5120] and [I-D.ietf-isis-mi].  Network
   administrators have to make their decisions based on local policies
   and preferences.  If multi-instance mechanism [I-D.ietf-isis-mi] is
   deployed in an IS-IS 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, respectively.


2.  Procedure

   This document does not require any modification to the procedure



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   specified in [I-D.ietf-isis-mi].  Nevertheless, only routes to IPv4-
   mapped IPv6 prefixes MUST be instantiated within a IPv4-mapped IPv6
   routing M-ISIS 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 IS-IS
   Instance, 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 IS-IS Instance IDs:

   o  Instance ID# for IPv4-mapped IPv6 unicast AF;

   o  Instance ID# for multicast IPv4-mapped IPv6 AF.


5.  Security Considerations

   This document does not introduce any security issue in addition to
   those defined in [I-D.ietf-isis-mi].


6.  Acknowledgements

   TBC


7.  References

7.1.  Normative References

   [RFC1195]  Callon, R., "Use of OSI IS-IS for routing in TCP/IP and
              dual environments", RFC 1195, December 1990.

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

   [RFC5120]  Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi



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              Topology (MT) Routing in Intermediate System to
              Intermediate Systems (IS-ISs)", RFC 5120, February 2008.

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-isis-mi]
              Previdi, S., Ginsberg, L., Shand, M., Ward, D., and A.
              Roy, "IS-IS Multi-Instance", draft-ietf-isis-mi-02 (work
              in progress), October 2009.










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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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