Network Working Group

Internet Engineering Task Force (IETF)                        J. Scudder
Internet-Draft
Request for Comments: 8810                              Juniper Networks
Updates: 5492 (if approved)                                  May 8,                                                August 2020
Intended status:
Category: Standards Track
Expires: November 9, 2020
ISSN: 2070-1721

          Revision to Capability Codes Registration Procedures
             draft-ietf-idr-capabilities-registry-change-09

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 "Private Use" is divided into three new ranges, respectively designated as ranges:
   "First Come First Served", "Experimental Use" Use", and "Reserved".

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   https://www.rfc-editor.org/info/rfc8810.

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Table of Contents

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

1.  Introduction

   The Border Gateway Protocol uses a mechanism called "Capability
   Advertisement" [RFC5492] to enable BGP peers to tell one another
   about their optional protocol extensions.  These so-called
   "Capabilities" are signaled using code points called "Capability
   Codes".

   [RFC5492] designates the range of Capability Codes 128-255 as
   "Reserved for Private
   "Private Use".  Subsequent experience has shown this to be not only
   useless, but actively confusing to implementors.

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

   o

   128-238:  First Come First Served
   o
   239-254:  Experimental Use
   o
   255:      Reserved

   The procedures for the ranges 1-63 and 64-127 are unchanged,
   remaining "IETF Review" and "First Come First Served" Served", respectively.
   The full range for "First Come First Served" is now 64-238.

2.  Discussion

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

   Since the range 128-255 was formerly designated Private Use, "Private Use",
   implementors may have chosen to use code points within that range
   prior to publication of this document.  For this reason, a survey was
   conducted beginning August 14, 2015 (version 01 of the individual
   draft)
   draft [SCUDDER]) to find any such uses.  A number were contributed
   and were used to seed Table 2.  Of course course, there can be no guarantee
   that all uses were discovered, however discovered; however, the likelihood seems high
   that remaining uses, if any, genuinely do fall under the intended use
   of "Private Use" and are restricted to some special deployment, deployment and
   are not in wide use.  Furthermore, any remaining uses would be no
   worse than any other code point collision, such as occasionally
   occurs with code point "squatting", and could be dealt with in the
   same manner.

3.  IANA Considerations

   IANA is requested to revise has revised the "Capability Codes" registry in the
   "Border Gateway Protocol (BGP) Parameters" group as follows.

   Reference: [RFC5492] and this document.

   Note: The IETF will be the Change Controller for all future
   registrations.

   Registration procedures:

                   +---------+-------------------------+

                   +=========+=========================+
                   |  Range  | Registration Procedures |
                   +---------+-------------------------+
                   +=========+=========================+
                   |   1-63  | IETF Review             |
                   +---------+-------------------------+
                   |  64-238 | First Come First Served |
                   +---------+-------------------------+
                   | 239-254 | Experimental Use        |
                   +---------+-------------------------+

                                  Table 1

   IANA is requested to perform has made the following new allocations within the "Capability
   Codes" registry:

   +-------+----------------------------------+-----------+------------+

      +=======+============================+===========+============+
      | Value | Description                | Reference | Change     |
      |       |                            |           | Controller |
   +-------+----------------------------------+-----------+------------+
      +=======+============================+===========+============+
      |  128  | Prestandard Route Refresh  | (this RFC 8810  | IETF       |
      |       | (deprecated)               | document)           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  129  | Prestandard Outbound Route | (this RFC 8810  | IETF       |
      |       | Filtering (deprecated),    | document)           |            |
      |       | prestandard Routing Policy |           |            |
      |       | Distribution (deprecated)  |           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  130  | Prestandard Outbound Route | (this RFC 8810  | IETF       |
      |       | Filtering (deprecated)     | document)           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  131  | Prestandard Multisession   | (this RFC 8810  | IETF       |
      |       | (deprecated)               | document)           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  184  | Prestandard FQDN (deprecated)           | (this RFC 8810  | IETF       |
      |       | (deprecated)               | document)           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  185  | Prestandard OPERATIONAL message    | (this RFC 8810  | IETF       |
      |       | message (deprecated)       | document)           |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+
      |  255  | Reserved                   | (this RFC 8810  | IETF       |
   |       |                                  | document) |            |
   +-------+----------------------------------+-----------+------------+
      +-------+----------------------------+-----------+------------+

                                  Table 2

4.  Security Considerations

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

5.

6.  References

6.1.

5.1.  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>.

   [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.

5.2.  Informative References

   [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>.

   [SCUDDER]  Scudder, J., "Revision to Capability Codes Registration
              Procedures", Work in Progress, Internet-Draft, draft-
              scudder-idr-capabilities-registry-change-01, 14 August
              2015, <https://tools.ietf.org/html/draft-scudder-idr-
              capabilities-registry-change-01>.

Acknowledgements

   Thanks to Alia Atlas, Bruno Decraene, Martin Djernaes, Jie Dong, Jeff
   Haas, Sue Hares, Acee Lindem, Thomas Mangin, and Tom Petch for review their
   reviews and comments.

Author's Address

   John Scudder
   Juniper Networks
   1194 N. Mathilda Ave
   Sunnyvale, CA 94089
   USA
   United States of America

   Email: jgs@juniper.net