A Lower Effort Per-Hop Behavior (LE PHB)
draft-tsvwg-le-phb-00

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Last updated 2016-10-21
Replaces draft-bless-tsvwg-le-phb
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Internet Engineering Task Force                                 R. Bless
Internet-Draft                   Karlsruhe Institute of Technology (KIT)
Updates: 3662,4594 (if approved)                        October 21, 2016
Intended status: Standards Track
Expires: April 24, 2017

                A Lower Effort Per-Hop Behavior (LE PHB)
                         draft-tsvwg-le-phb-00

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

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 24, 2017.

Copyright Notice

   Copyright (c) 2016 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

Bless                    Expires April 24, 2017                 [Page 1]
Internet-Draft              Lower Effort PHB                October 2016

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Applicability . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Deployment Considerations . . . . . . . . . . . . . . . .   4
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  PHB Description . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Traffic Conditioning Actions  . . . . . . . . . . . . . . . .   5
   4.  Recommended DS Codepoint  . . . . . . . . . . . . . . . . . .   5
   5.  Remarking to other DSCPs/PHBs . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  History of the LE PHB  . . . . . . . . . . . . . . .   7
   Appendix B.  Acknowledgments  . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   This document defines a Differentiated Services per-hop behavior
   RFC 2474 [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
   optional; that is, packets of this type of traffic ought to consume
   network resources only when no other traffic is present.
   Alternatively, the effect of this type of traffic on all other
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