Individual Submission G. Huston
Internet-Draft September 11, 2008
Intended status: BCP
Expires: March 15, 2009
AS Number Reservation for Documentation Use
draft-huston-as-documentation-reservation-00.txt
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Abstract
To reduce the likelihood of conflict and confusion when relating
documented examples to deployed systems, two blocks of Autonomous
System numbers (ASNs) are reserved for use in examples in RFCs,
books, documentation, and the like. This document describes the
reservation of two blocks of ASNs as reserved numbers for use in
documentation.
1. Introduction
To reduce the likelihood of conflict and confusion when relating
documented examples to deployed systems, two blocks of Autonomous
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System numbers (ASNs) are reserved for use in examples in RFCs,
books, documentation, and the like. This document describes the
reservation of two blocks of ASNs as reserved numbers for use in
documentation.
The problems such conflicts may cause have already been encountered
with IPv4 addresses where literal use of documented examples in a
production environment causes address and routing conflicts with
existing services. Since private use ASNs already have a context of
use in deployed networks, these ASNs cannot be used in many example
situations. In making an explicit allocation of a set of AS numbers
reserved for documentation use, it is intended that any such
operational problems may be avoided in the future.
Similar considerations have been applied to IPv4 addresses
[IANA.IPv4], IPv6 addresses [RFC3849], and domain names names
[RFC2606], and reservations have been made for similar purposes.
2. ASNs for Documentation Use
To allow documentation to accurately describe deployment examples,
the use of public or private-use AS numbers is inappropriate, and a
reserved block of AS numbers is required. This ensures that
documentation does not clash with public or private use AS numbers in
deployed networks, and mitigates the risks to operational integrity
of the network through inappropriate use of documentation to perform
literal configuration of routing elements on production systems.
To allow for examples relating to the transition to use of 32-bit AS
numbers to be correctly described a reservation of two blocks of AS
numbers is proposed in this document. One reserved block of 16
contiguous AS numbers is to lie in the range of numbers that can be
expressed as a 16-bit AS number value (i.e. values less than 65536),
and a second reserved block of 16 contiguous AS numbers is to lie in
the range of numbers that can only be expressed as 32-bit AS numbers
(values greater than 65535).
3. Operational Implications
This assignment implies that BGP operational configurations should
not peer with neighboring ASes that are numbered from this reserved
AS number set.
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4. IANA Considerations
[Note to IANA, not for publication: The IANA may wish to consider
reserving the AS numbers 64496 - 64511 and 65536-65551 (1.0 - 1.15
using "asdot" notation) for this purpose.]
IANA is requested to reserve a contiguous block of 16 Autonomous
System numbers from the unallocated number range within the "16-bit"
number set, 1 - 64512, and to reserve a contiguous block of 16
Autonomous System numbers from the "32-bit" number set, 65536 -
4294967294, and documentation this reservation in the IANA AS Number
Registry [IANA.AS].
5. Security Considerations
AS number reservations do not have any direct impact on Internet
infrastructure security.
6. Acknowledgements
The author acknowledges the work of Tomoya Yoshida, Gaurab Upadhaya
and Philip Smith in authoring a policy proposal that was submitted to
the APNIC Policy Process in 2008 relating to the reservation of AS
numbers for documentation purposes.
7. Informative References
[IANA.AS] IANA, "Autonomous System (AS) Numbers", Sep 2008,
<http://www.iana.org/assignments/as-numbers/>.
[IANA.IPv4]
IANA, "IPv4 Global Unicast Address Assignments", Sep 2008,
<http://www.iana.org/assignments/ipv4-address-space/>.
[RFC2606] Eastlake, D. and A. Panitz, "Reserved Top Level DNS
Names", BCP 32, RFC 2606, June 1999.
[RFC3849] Huston, G., Lord, A., and P. Smith, "IPv6 Address Prefix
Reserved for Documentation", RFC 3849, July 2004.
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Author's Address
Geoff Huston
Email: gih@apnic.net
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