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Versions: 00 01 draft-ietf-v6ops-routing-guidelines

Network Working Group                                        M. Blanchet
Internet-Draft                                                  Viagenie
Expires: September 6, 2006                                 March 5, 2006


                    IPv6 Routing Policies Guidelines
             draft-blanchet-v6ops-routing-guidelines-01.txt

Status of this Memo

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Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   Guidelines on how to handle IPv6 routes are needed for operators of
   networks, either providers or enterprises.  This document is a
   followup on RFC2772 work but for the production IPv6 Internet.
   RFC2772 becomes historic.








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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Address Types . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.1.  Node-scoped Unicast . . . . . . . . . . . . . . . . . . . . 3
     2.2.  Compatibility Addresses . . . . . . . . . . . . . . . . . . 3
     2.3.  Link-scoped Unicast . . . . . . . . . . . . . . . . . . . . 3
     2.4.  Site-scoped Unicast . . . . . . . . . . . . . . . . . . . . 3
     2.5.  Global Unicast  . . . . . . . . . . . . . . . . . . . . . . 3
       2.5.1.  Documentation Prefix  . . . . . . . . . . . . . . . . . 4
       2.5.2.  6to4  . . . . . . . . . . . . . . . . . . . . . . . . . 4
       2.5.3.  6bone . . . . . . . . . . . . . . . . . . . . . . . . . 4
     2.6.  Default Route . . . . . . . . . . . . . . . . . . . . . . . 4
     2.7.  Multicast . . . . . . . . . . . . . . . . . . . . . . . . . 4
     2.8.  Unknown addresses . . . . . . . . . . . . . . . . . . . . . 4
   3.  RPSL  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  Document Status . . . . . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 7
   Intellectual Property and Copyright Statements  . . . . . . . . . . 8





























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1.  Introduction

   To maintain stability, efficiency and scalability of the IPv6
   Internet, guidelines for routing policies are needed for operators
   deploying IPv6 networks.  Prior experience on IPv6 routing guidelines
   on the 6bone[RFC2772], practical deployment of the IPv6 internet and
   IPv6 specifications were used as input to this document.

   This document first describes the different types of addresses and
   then summarizes the suggested policies in RPSL.


2.  Address Types

2.1.  Node-scoped Unicast

   The node-scoped unicast addresses[RFC3513] such as the loopback
   (::1/128), the unspecified (::/128) must not be advertised in an IGP
   or EGP and should be filtered out when received.

2.2.  Compatibility Addresses

   IPv4-mapped addresses (::FFFF:0:0/96)[RFC3513] must not be advertised
   and should be filtered out.

2.3.  Link-scoped Unicast

   The link-scoped unicast[RFC3513] routes (fe80::/16) must not be
   advertised in an IGP or EGP and should be filtered out when received.

2.4.  Site-scoped Unicast

   The site-scoped unicast routes (fc00::/7) may be advertised in an
   IGP.  It must not be advertised in an EGP connected to the global
   Internet and should be filtered out when received.  However, it may
   be advertised in an EGP between two networks sharing a private
   interconnect, but must not be advertised outside the scope of these
   networks.  When advertised in an EGP, these routes should be of
   length /48.

2.5.  Global Unicast

   The global unicast routes (2000::/3)[RFC3513] may be advertised in an
   IGP or EGP.  A minimal EGP routing policy should filter out routes
   that exceed a maximum length.  Determining the maximum length of a
   global Internet route is outside the scope of this document.

   A finer EGP routing policy may use only the allocated address space



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   from IANA to registry as specified in
   http://www.iana.org/assignments/ipv6-unicast-address-assignments.
   This would result in better filtering since the non-allocated
   prefixes will be filtered out.

   An even finer EGP routing policy may use only the assigned address
   space from registries to providers as available in the registry
   databases.  This would result in the best filtering since the non-
   assigned prefixes will be filtered out.  However, this requires the
   synchronization of the filters with the registry databases.

2.5.1.  Documentation Prefix

   The 2001:0db8::/32 prefix[RFC3849] is used for documentation purposes
   and must not be advertised in an IGP or EGP and should be filtered
   out when received.

2.5.2.  6to4

   The 6to4 prefix (2002::/16) may be advertised in an IGP or EGP, when
   the site is running a 6to4 relay.  However, the provider of this
   service should be aware of the implications of running such
   service[RFC3964], which includes some specific filtering rules for
   6to4.

2.5.3.  6bone

   The 6bone experimental network used some experimental allocations,
   such as 5f00::/8[RFC1987] and 3ffe::/16[RFC2471] that were later
   returned to IANA[RFC3701].  These prefixes should not be advertised
   in an EGP unless IANA reallocates them subsequently.

2.6.  Default Route

   The default unicast route (::) may be advertised in an IGP.  In an
   EGP, it may be only advertised to the downstream but must not be
   advertised in the core.

2.7.  Multicast

   Multicast addresses (ff00::/8)[RFC3513] have a scope in the address
   field.  In the multicast routing, the routes should be announced
   according to the scope, similar to unicast routes.  Multicast routes
   must not appear in unicast routing tables.

2.8.  Unknown addresses

   Any non listed address above must not be advertised and should be



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   filtered out.


3.  RPSL

   The Route Policy Specification Language(RPSL)[RFC4012] used in route
   registries supports the policies described in this document and
   should be considered to manage route policies.

   The following RPSL code implements the policies described in this
   document.

   TBD: RPSL code to fill


4.  Document Status

   This document should be a BCP.  This document should put RFC 2772 as
   historic.


5.  Security Considerations

   TBD.


6.  Acknowledgements

   Florent Parent, Pekka Savola and Tim Chown have provided input and
   suggestions to this document.

7.  References

   [RFC1987]  Newman, P., Edwards, W., Hinden, R., Hoffman, E., Ching
              Liaw, F., Lyon, T., and G. Minshall, "Ipsilon's General
              Switch Management Protocol Specification Version 1.1",
              RFC 1987, August 1996.

   [RFC2471]  Hinden, R., Fink, R., and J. Postel, "IPv6 Testing Address
              Allocation", RFC 2471, December 1998.

   [RFC2772]  Rockell, R. and B. Fink, "6Bone Backbone Routing
              Guidelines", RFC 2772, February 2000.

   [RFC3513]  Hinden, R. and S. Deering, "Internet Protocol Version 6
              (IPv6) Addressing Architecture", RFC 3513, April 2003.

   [RFC3701]  Fink, R. and R. Hinden, "6bone (IPv6 Testing Address



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              Allocation) Phaseout", RFC 3701, March 2004.

   [RFC3849]  Huston, G., Lord, A., and P. Smith, "IPv6 Address Prefix
              Reserved for Documentation", RFC 3849, July 2004.

   [RFC3964]  Savola, P. and C. Patel, "Security Considerations for
              6to4", RFC 3964, December 2004.

   [RFC4012]  Blunk, L., Damas, J., Parent, F., and A. Robachevsky,
              "Routing Policy Specification Language next generation
              (RPSLng)", RFC 4012, March 2005.








































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Author's Address

   Marc Blanchet
   Viagenie

   Email: Marc.Blanchet@viagenie.ca













































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Intellectual Property Statement

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Copyright Statement

   Copyright (C) The Internet Society (2006).  This document is subject
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Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.




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