Tech-invite3GPPspaceIETFspace
959493929190898887868584838281807978777675747372717069686766656463626160595857565554535251504948474645444342414039383736353433323130292827262524232221201918171615141312111009080706050403020100
in Index   Prev   Next

RFC 4020

Early IANA Allocation of Standards Track Code Points

Pages: 7
Obsoleted by:  7120

ToP   noToC   RFC4020 - Page 1
Network Working Group                                        K. Kompella
Request for Comments: 4020                              Juniper Networks
BCP: 100                                                        A. Zinin
Category: Best Current Practice                                  Alcatel
                                                           February 2005


          Early IANA Allocation of Standards Track Code Points

Status of This Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

This memo discusses earlier allocation of code points by IANA as a remedy to the problem created by the "Standards Action" IANA policy for protocols for which, by the IETF process, implementation and deployment experience is desired or required prior to publication.

1. Introduction

In Standards Track RFCs, there is often a need to allocate code points for various objects, messages, or other protocol entities so that implementations can interoperate. Many of these code point spaces have registries handled by the Internet Assigned Number Authority (IANA). Several IANA allocation policies are described in RFC 2434 [2434]. Some of them, such as First Come First Served or Expert Review, do not require a formal IETF action before the IANA performs allocation. However, in situations where code points are a scarce resource and/or the IETF community is willing to retain tight control of the protocol, policies such as IESG Approval, IETF Consensus, or Standards Action have been used. The Standards Action policy represents a problem in situations where implementation and/or deployment experience are desired or required for the Standards Action. To break the deadlock, "pre-RFC" implementations have sometimes simply chosen some "seemingly unused" code points; these may turn out to be different from those later assigned by IANA. To make matters worse, these "pre-RFC" implementations are often deployed. This creates several potential interoperability problems between early
ToP   noToC   RFC4020 - Page 2
   implementations and implementations of the final standard, as
   described below:

   1. IANA allocates code points different from those that early
      implementations assumed would be allocated.  Early implementations
      won't interoperate with standard ones.

   2. IANA allocates code points used silently for other extensions.
      Different extensions will collide.

   This gets in the way of the main purpose of standards; namely, to
   facilitate interoperable implementations.

   It is easy to say that pre-RFC implementations should be kept private
   and should not be deployed; however, both the length of the standards
   process and the immense value of early implementations and early
   deployments suggest finding a better solution.  As an example, in the
   case of documents produced by Working Groups in the Routing Area, a
   pre-RFC implementation is highly desirable and sometimes even
   required, and early deployments provide useful feedback on the
   technical and operational quality of the specification.

   This memo proposes that, under strictly controlled circumstances,
   IANA make an early allocation of code points.  The memo lays out the
   conditions for early allocation, as well as the process to be
   followed; it also says how these allocations are dealt with in the
   event of a failure in the process (such as the RFC not being
   published).

   This memo only addresses the early allocation of code points from
   spaces whose allocation policy is "Standards Action" [2434] AND that
   have been amended to permit early allocation.  This permission must
   be granted by the IESG, and code spaces with permission for early
   allocation must be marked as such in the IANA registry.

2. Conditions for Early Allocation

The following conditions must hold before a request may be made for early allocation of code points: a) The code points must be from a space designated as "Standards Action", amended by IESG approval to permit Early Allocation. b) The format, semantics, processing, and other rules related to handling the protocol entities defined by the code points (henceforth called "specifications") must be adequately described in an Internet draft that is proposed as Standards Track.
ToP   noToC   RFC4020 - Page 3
   c) The specifications of these code points must be stable; i.e., if
      there is a change, implementations based on the earlier and later
      specifications must be seamlessly interoperable.

   d) There is sufficient interest in early (pre-RFC) implementation and
      deployment in the community.

   If conditions (a) or (b) are not met, then the processes in this memo
   do not apply.

3. Process for Early Allocation

There are three processes associated with early allocation: making the request for code points; following up on the request; and revoking an early allocation. It cannot be emphasized enough that these processes must have a minimal impact on IANA itself, or they will not be feasible. The processes described below assume that the document in question is the product of an IETF Working Group. If this is not the case, replace "WG chairs" below with "shepherding Area Director".

3.1. Request

The process for requesting and obtaining early allocation of code points is as follows: 1) The authors (editors) of the document submit a request for early allocation to the Working Group chairs, specifying which code points require early allocation and which document they should be assigned to. 2) The WG chairs determine whether the conditions for early allocations described in section 2 are met; particularly, conditions (c) and (d). 3) The WG chairs gauge whether there is consensus within the WG that early allocation is appropriate in the case of the given document. 4) If it is, with the approval of the Area Director(s), the WG chairs request IANA to make an early allocation. 5) IANA makes an allocation from the appropriate registry, marking it as "temporary", valid for a period of one year from the date of allocation. The date of allocation should also be recorded in the registry and made visible to the public.
ToP   noToC   RFC4020 - Page 4
   Note that Internet Drafts should not include a specific value of a
   code point until this value has been formally allocated by IANA.

3.2. Follow-Up

It is the responsibility of the document authors and the Working Group chairs to review changes in the document, and especially in the specifications of the code points for which early allocation was requested, to ensure that the changes are backward compatible. If at some point changes that are not backward compatible are nonetheless required, a decision needs to be made as to whether previously allocated code points must be deprecated (see section 3.3 for more information on code point deprecation). The considerations include aspects such as the possibility of existing deployments of the older implementations and, hence, the possibility for a collision between older and newer implementations in the field. If the document progresses to the point at which IANA normally makes code point allocations, it is the responsibility of the authors and the WG chairs to remind IANA that there were early allocations, and of the code point values so allocated, in the IANA Considerations section of the RFC-to-be. Allocation is then just a matter of removing the "temporary" tag from the allocation description.

3.3. Expiry

If early allocations expire before the document progresses to the point where IANA normally makes allocations, the authors and WG chairs may follow an abbreviated version of the process in section 3.1 to request renewal of the code points. At most, one renewal request may be made; thus, authors should choose carefully when the original request is to be made. As an exception to the above rule, under rare circumstances, more than one allocation renewal may be justified. All such renewal requests must be reviewed by the IESG. The renewal request to the IESG must include the reasons why such renewal is necessary, and the WG's plans regarding the specification. If a follow-up request is not made, or the document fails to progress to a Standards Track RFC, the WG chairs are responsible for informing IANA that the code points are to be marked "deprecated" (and are not to be allocated). The WG chairs are further responsible for informing IANA when the deprecated code points can be completely de- allocated (i.e., made available for new allocations).
ToP   noToC   RFC4020 - Page 5
   In particular, it is not IANA's responsibility to track the status of
   allocations, their expiration, or when they may be re-allocated.

   Note that if a document is submitted for review to the IESG and at
   the time of submission some early allocations are valid (not
   expired), these allocations should not be expired while the document
   is under IESG consideration or waiting in the RFC Editor's queue
   after approval by the IESG.

4. IANA Considerations

This document defines procedures for early allocation of code points in the registries with the Standards Action policy and as such directly affects IANA functions.

5. Normative References

[2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.

6. Security Considerations

It is important to keep in mind 'denial of service' attacks on IANA as a result of the processes in this memo. There are two that are immediately obvious: depletion of code space by early allocations and process overloading of IANA itself. The processes described here attempt to alleviate both of these, but they should be subject to scrutiny to ensure this.

7. Acknowledgements

Many thanks to Bert Wijnen, Adrian Farrel, and Bill Fenner for their input.
ToP   noToC   RFC4020 - Page 6

Authors' Addresses

Kireeti Kompella Juniper Networks 1194 N. Mathilda Ave Sunnyvale, CA 94089 USA EMail: kireeti@juniper.net Alex Zinin Alcatel 701 E Middlefield Rd Mountain View, CA 94043 EMail: zinin@psg.com
ToP   noToC   RFC4020 - Page 7
Full Copyright Statement

   Copyright (C) The Internet Society (2005).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the IETF's procedures with respect to rights in IETF Documents can
   be found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at ietf-
   ipr@ietf.org.


Acknowledgement

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