Network Working Group M. Boucadair
Internet-Draft C. Jacquenet
Intended status: Standards Track France Telecom
Expires: April 23, 2010 D. Cheng
Huawei
Y. Lee
Comcast
October 20, 2009
Multi-Topology OSPFv3 for IPv4-mapped IPv6
draft-boucadair-ospf-v4v6-ospfv3-mt-01
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Copyright Notice
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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 goal of running separate
instances for IPv4-mapped IPv6 routes is to isolate the IPv6 routing
table from the IPv4 routing table, and to avoid any overload due to
the population of the table by IPv4-inferred routes. This isolation
is motivated also from an operational perspective to enforce specific
routing 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
the need to distinguish the IPv6 routing topology from the IPv4
routing topology. 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.
Within the double context of IPv4 address exhaustion and the IPv6-
IPv4 interconnection, numerous solutions are being 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 any overload of 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, where the native
IPv6 topology would be distinct from the IPv4-mapped topology. This
is also motivated for operational reasons and to ease the migration
to full IPv6. As a result, the unicast IPv4-mapped IPv6 topology is
used for unicast IPv4-mapped IPv6 route computation purposes, and the
multicast IPv4-mapped IPv6 topology is used for multicast IPv4-mapped
IPv6 route computation purposes.
As a reminder, [I-D.ietf-ospf-af-alt] sspecifies a mechanism to
maintain multiple topologies. 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 to
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 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 prefix defined in
[I-D.ietf-behave-address-format] MUST be supported by default.
Service providers MAY also choose a LIR prefix to build the IPv4-
mapped IPv6 addresses.
3. Forwarding
Only incoming datagrams destined to IPv4-mapped IPv6 addresses are
associated (and therfore forwarded according to ) 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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