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Versions: (draft-scudder-idr-capabilities-registry-change) 00 01 02

Network Working Group                                         J. Scudder
Internet-Draft                                          Juniper Networks
Updates: 5492 (if approved)                             November 6, 2018
Intended status: Standards Track
Expires: May 10, 2019


          Revision to Capability Codes Registration Procedures
           draft-ietf-idr-capabilities-registry-change-00.txt

Abstract

   This document updates RFC 5492 by making a change to the registration
   procedures for BGP Capability Codes.  Specifically, the range
   formerly designated "Reserved for Private Use" is divided into three
   new ranges, respectively designated as "First Come First Served",
   "Experimental" and "Reserved".

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 10, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   [RFC5492] designates the range of Capability Codes 128-255 as
   "Reserved for Private Use".  Subsequent experience has shown this to
   be not only useless, but actively confusing to implementors.  BGP
   Capability Codes do not meet the criteria for "Private Use" described
   in [RFC8126] S. 4.1.  An example of a legitimate "private use" code
   point might be a BGP community [RFC1997] value assigned for use
   within a given AS, but no analogous use of Capabilities exists.

   Accordingly, this document revises the registration procedures for
   the range 128-255, as follows, using the terminology defined in
   [RFC8126]:

   128-238: First Come First Served

   239-254: Experimental Use

   255: Reserved

   The procedures for the ranges 1-63 and 64-127 are unchanged,
   remaining "IETF Review" and "First Come First Served" respectively.

2.  Discussion

   The reason for providing an Experimental Use range is to preserve a
   range for use during early development.  Although there are few
   practical differences between Experimental and Private Use, the
   change both makes it clear that code points from this space should
   not be used long-term or in shipping products, and reduces the
   consumption of the scarce Capability Code space expended for this
   purpose.  Once classified as Experimental, it should be considered




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   difficult to reclassify the space for some other purpose in the
   future.

   The reason for reserving the maximum value is that it may be useful
   in the future if extension of the number space is needed.

   We note that since the range 128-255 was formerly ungoverned,
   implementors may have chosen to use code points within that range
   prior to publication of this document.  Although it is not possible
   to know what code points implementors may have used, experience
   suggests 128 is a likely value.  For that reason, this document asks
   IANA to reserve that value, to minimize the risk of conflict with
   existing implementations.

   Finally, we invite implementors who have used values in the range
   128-255 to contribute to this draft, so that the values can be
   included in the registry.

3.  IANA Considerations

   IANA is requested to revise the "Capability Codes" registry as
   described in Section 1.  Since the range 128-238 is adjacent to the
   existing First Come First Served range, after this change the entire
   First Come First Served range will be 64-238.

   IANA is requested to allocate value 128 as "Reserved".

4.  Security Considerations

   This revision to registration procedures does not change the
   underlying security issues inherent in the existing [RFC5492] and
   [RFC4271].

5.  Acknowledgements

   Thanks to Alia Atlas, Bruno Decraene, Jeff Haas, Sue Hares and Thomas
   Mangin for review and comments.

6.  References

6.1.  Normative References

   [RFC5492]  Scudder, J. and R. Chandra, "Capabilities Advertisement
              with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February
              2009, <https://www.rfc-editor.org/info/rfc5492>.






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   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

6.2.  Informative References

   [RFC1997]  Chandra, R., Traina, P., and T. Li, "BGP Communities
              Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996,
              <https://www.rfc-editor.org/info/rfc1997>.

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <https://www.rfc-editor.org/info/rfc4271>.

Author's Address

   John Scudder
   Juniper Networks
   1194 N. Mathilda Ave
   Sunnyvale, CA  94089
   USA

   Email: jgs@juniper.net


























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