Update to IANA Registration Procedures for Pool 3 Values in the Differentiated Services Field Codepoints (DSCP) Registry
RFC 8436

Document Type RFC - Proposed Standard (August 2018; No errata)
Updates RFC 2474
Last updated 2018-08-21
Replaces draft-fairhurst-tsvwg-iana-dscp-registry
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Aug 2018 - Submit 'A Lower Effo... )
Document shepherd David Black
Shepherd write-up Show (last changed 2018-05-08)
IESG IESG state RFC 8436 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Spencer Dawkins
Send notices to David Black <david.black@dell.com>
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                      G. Fairhurst
Request for Comments: 8436                        University of Aberdeen
Updates: 2474                                                August 2018
Category: Standards Track
ISSN: 2070-1721

    Update to IANA Registration Procedures for Pool 3 Values in the
        Differentiated Services Field Codepoints (DSCP) Registry

Abstract

   The Differentiated Services (Diffserv) architecture specifies use of
   the DS field in the IPv4 and IPv6 packet headers to carry one of 64
   distinct differentiated services field codepoint (DSCP) values.  The
   Internet Assigned Numbers Authority (IANA) maintains a registry of
   assigned DSCP values.

   This update to RFC 2474 changes the IANA registration policy for Pool
   3 of the registry (i.e., DSCP values of the form xxxx01) to Standards
   Action, i.e., values are assigned through a Standards Track or Best
   Current Practice RFC.  The update also removes permission for
   experimental and local use of the codepoints that form Pool 3 of the
   DSCP registry; Pool 2 Codepoints (i.e., DSCP values of the form
   xxxx11) remain available for these purposes.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8436.

Fairhurst                    Standards Track                    [Page 1]
RFC 8436      IANA Registration Procedures for DSCP Pool 3   August 2018

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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  The Updates to RFC 2474 . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The Differentiated Services (Diffserv) [RFC2475] architecture
   (updated by [RFC3260]) provides scalable service differentiation in
   the Internet.  Diffserv uses the six most significant bits of the
   former IPv4 Type of Service (TOS) octet or the former IPv6 Traffic
   Class octet to convey the field, which is used to carry the DSCP.
   This DSCP value is used to select a Diffserv per-hop behavior (PHB).

   The six-bit field is capable of conveying 64 distinct codepoints, and
   this codepoint space has been divided into three pools for the
   purpose of codepoint assignment and management (as shown in
   Figure 1).  Pool 1 comprises 32 codepoints [RFC2474].  These are
   assigned by Standards Action, as defined in [RFC8126].  Pool 2
   comprises a pool of 16 codepoints reserved for Experimental or Local
   Use (EXP/LU) as defined in [RFC2474].  Pool 3 comprises 16
   codepoints, which were originally specified as "initially available
   for experimental or local use, but which should be preferentially
   utilized for standardized assignments if Pool 1 is ever exhausted" by
   [RFC2474].

Fairhurst                    Standards Track                    [Page 2]
RFC 8436      IANA Registration Procedures for DSCP Pool 3   August 2018

                  +------+-----------------+
                  | Pool | Codepoint Space |
                  +------+-----------------+
                  |  1   |      xxxxx0     |
                  +------+-----------------+
                  |  2   |      xxxx11     |
                  +------+-----------------+
                  |  3   |      xxxx01     |
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