A Lower-Effort Per-Hop Behavior (LE PHB) for Differentiated Services
RFC 8622

Document Type RFC - Proposed Standard (June 2019; No errata)
Obsoletes RFC 3662
Last updated 2019-06-18
Replaces draft-bless-tsvwg-le-phb
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd David Black
Shepherd write-up Show (last changed 2018-11-09)
IESG IESG state RFC 8622 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Magnus Westerlund
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)                          R. Bless
Request for Comments: 8622                                           KIT
Obsoletes: 3662                                                June 2019
Updates: 4594, 8325
Category: Standards Track
ISSN: 2070-1721

  A Lower-Effort Per-Hop Behavior (LE PHB) for Differentiated Services

Abstract

   This document specifies properties and characteristics of a Lower-
   Effort Per-Hop Behavior (LE PHB).  The primary objective of this LE
   PHB is to protect Best-Effort (BE) traffic (packets forwarded with
   the default PHB) from LE traffic in congestion situations, i.e., when
   resources become scarce, BE traffic has precedence over LE traffic
   and may preempt it.  Alternatively, packets forwarded by the LE PHB
   can be associated with a scavenger service class, i.e., they scavenge
   otherwise-unused resources only.  There are numerous uses for this
   PHB, e.g., for background traffic of low precedence, such as bulk
   data transfers with low priority in time, non-time-critical backups,
   larger software updates, web search engines while gathering
   information from web servers and so on.  This document recommends a
   standard Differentiated Services Code Point (DSCP) value for the LE
   PHB.

   This specification obsoletes RFC 3662 and updates the DSCP
   recommended in RFCs 4594 and 8325 to use the DSCP assigned in this
   specification.

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/rfc8622.

Bless                        Standards Track                    [Page 1]
RFC 8622                    Lower-Effort PHB                   June 2019

Copyright Notice

   Copyright (c) 2019 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Language ...........................................3
   3. Applicability ...................................................3
   4. PHB Description .................................................6
   5. Traffic-Conditioning Actions ....................................7
   6. Recommended DSCP ................................................7
   7. Deployment Considerations .......................................8
   8. Re-marking to Other DSCPs/PHBs ..................................9
   9. Multicast Considerations .......................................10
   10. The Updates to RFC 4594 .......................................11
   11. The Updates to RFC 8325 .......................................12
   12. IANA Considerations ...........................................13
   13. Security Considerations .......................................14
   14. References ....................................................15
      14.1. Normative References .....................................15
      14.2. Informative References ...................................15
   Appendix A. History of the LE PHB .................................18
   Acknowledgments ...................................................18
   Author's Address ..................................................18
Show full document text