6LoWPAN Selective Fragment Recovery
draft-ietf-6lo-fragment-recovery-11

The information below is for an old version of the document
Document Type Active Internet-Draft (6lo WG)
Author Pascal Thubert 
Last updated 2020-02-10 (latest revision 2020-02-06)
Replaces draft-thubert-6lo-fragment-recovery
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Carles Gomez
Shepherd write-up Show (last changed 2019-10-23)
IESG IESG state Waiting for Writeup
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Responsible AD Suresh Krishnan
Send notices to Carles Gomez <carlesgo@entel.upc.edu>
IANA IANA review state Version Changed - Review Needed
6lo                                                      P. Thubert, Ed.
Internet-Draft                                             Cisco Systems
Updates: 4944 (if approved)                             10 February 2020
Intended status: Standards Track                                        
Expires: 13 August 2020

                  6LoWPAN Selective Fragment Recovery
                  draft-ietf-6lo-fragment-recovery-11

Abstract

   This draft updates RFC 4944 with a simple protocol to recover
   individual fragments across a route-over mesh network, with a minimal
   flow control to protect the network against bloat.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 13 August 2020.

Copyright Notice

   Copyright (c) 2020 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
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Thubert                  Expires 13 August 2020                 [Page 1]
Internet-Draft               Selective RFRAG               February 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  BCP 14  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  References  . . . . . . . . . . . . . . . . . . . . . . .   4
     2.3.  New Terms . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Updating RFC 4944 . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Extending draft-ietf-6lo-minimal-fragment . . . . . . . . . .   6
     4.1.  Slack in the First Fragment . . . . . . . . . . . . . . .   7
     4.2.  Gap between frames  . . . . . . . . . . . . . . . . . . .   7
     4.3.  Modifying the First Fragment  . . . . . . . . . . . . . .   7
   5.  New Dispatch types and headers  . . . . . . . . . . . . . . .   8
     5.1.  Recoverable Fragment Dispatch type and Header . . . . . .   8
     5.2.  RFRAG Acknowledgment Dispatch type and Header . . . . . .  11
   6.  Fragments Recovery  . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Forwarding Fragments  . . . . . . . . . . . . . . . . . .  14
       6.1.1.  Receiving the first fragment  . . . . . . . . . . . .  15
       6.1.2.  Receiving the next fragments  . . . . . . . . . . . .  15
     6.2.  Receiving RFRAG Acknowledgments . . . . . . . . . . . . .  16
     6.3.  Aborting the Transmission of a Fragmented Packet  . . . .  16
     6.4.  Applying Recoverable Fragmentation along a Diverse
           Path  . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Management Considerations . . . . . . . . . . . . . . . . . .  17
     7.1.  Protocol Parameters . . . . . . . . . . . . . . . . . . .  17
     7.2.  Observing the network . . . . . . . . . . . . . . . . . .  19
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  20
   11. Normative References  . . . . . . . . . . . . . . . . . . . .  21
   12. Informative References  . . . . . . . . . . . . . . . . . . .  21
   Appendix A.  Rationale  . . . . . . . . . . . . . . . . . . . . .  24
   Appendix B.  Requirements . . . . . . . . . . . . . . . . . . . .  25
   Appendix C.  Considerations on Flow Control . . . . . . . . . . .  26
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   In most Low Power and Lossy Network (LLN) applications, the bulk of
   the traffic consists of small chunks of data (on the order of a few
   bytes to a few tens of bytes) at a time.  Given that an IEEE Std.
   802.15.4 [IEEE.802.15.4] frame can carry a payload of 74 bytes or
   more, fragmentation is usually not required.  However, and though
   this happens only occasionally, a number of mission critical
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