A Lower Effort Per-Hop Behavior (LE PHB)
draft-ietf-tsvwg-le-phb-01

Document Type Active Internet-Draft (tsvwg WG)
Last updated 2017-02-06
Replaces draft-bless-tsvwg-le-phb
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Internet Engineering Task Force                                 R. Bless
Internet-Draft                   Karlsruhe Institute of Technology (KIT)
Obsoletes: 3662 (if approved)                           February 6, 2017
Updates: 4594 (if approved)
Intended status: Standards Track
Expires: August 10, 2017

                A Lower Effort Per-Hop Behavior (LE PHB)
                       draft-ietf-tsvwg-le-phb-01

Abstract

   This document specifies properties and characteristics of a Lower
   Effort (LE) per-hop behavior (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, best-effort traffic has precedence over LE
   traffic and may preempt it.  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 DSCP value for the LE PHB.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 10, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Bless                    Expires August 10, 2017                [Page 1]
Internet-Draft              Lower Effort PHB               February 2017

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://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
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   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
     1.1.  Applicability . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Deployment Considerations . . . . . . . . . . . . . . . .   4
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  PHB Description . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Traffic Conditioning Actions  . . . . . . . . . . . . . . . .   5
   4.  Recommended DS Codepoint  . . . . . . . . . . . . . . . . . .   6
   5.  Remarking to other DSCPs/PHBs . . . . . . . . . . . . . . . .   6
   6.  Changes to RFC 4594 . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  History of the LE PHB  . . . . . . . . . . . . . . .   9
   Appendix B.  Acknowledgments  . . . . . . . . . . . . . . . . . .   9
   Appendix C.  Change History . . . . . . . . . . . . . . . . . . .  10
   Appendix D.  Note to RFC Editor . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document defines a Differentiated Services per-hop behavior
   [RFC2474] called "Lower Effort" (LE) which is intended for traffic of
   sufficiently low urgency, in which all other traffic takes precedence
   over LE traffic in consumption of network link bandwidth.  Low
   urgency traffic has got a low priority in time, which does not
   necessarily imply that it is generally of minor importance.  From
   this viewpoint, it can be considered as a network equivalent to a
   background priority for processes in an operating system.  There may
   or may not be memory (buffer) resources allocated for this type of
   traffic.

   Some networks carry traffic for which delivery is considered
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