RPL Observations
draft-rahul-roll-rpl-observations-02

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ROLL                                                      R. Jadhav, Ed.
Internet-Draft                                                  R. Sahoo
Intended status: Standards Track                                   Y. Wu
Expires: February 25, 2019                                        Huawei
                                                         August 24, 2018

                            RPL Observations
                  draft-rahul-roll-rpl-observations-02

Abstract

   This document describes RPL protocol design issues, various
   observations and possible consequences of the design and
   implementation choices.

Status of This Memo

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   This Internet-Draft will expire on February 25, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Jadhav, et al.          Expires February 25, 2019               [Page 1]
Internet-Draft              RPL Observations                 August 2018

Table of Contents

   1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language and Terminology . . . . . . . . . .   3
   3.  DTSN increment in storing MOP . . . . . . . . . . . . . . . .   3
     3.1.  Deliberations . . . . . . . . . . . . . . . . . . . . . .   5
   4.  DAO retransmission and use of DAO-ACK in storing MOP  . . . .   5
     4.1.  Significance of bidirectional Path establishment
           indication and relevance of DAO-ACK . . . . . . . . . . .   6
     4.2.  Problems with hop-by-hop DAO-ACK  . . . . . . . . . . . .   6
     4.3.  Problems with end-to-end DAO-ACK  . . . . . . . . . . . .   6
     4.4.  Deliberations . . . . . . . . . . . . . . . . . . . . . .   6
     4.5.  Implementation Notes  . . . . . . . . . . . . . . . . . .   7
   5.  Handling resource unavailability  . . . . . . . . . . . . . .   7
     5.1.  Deliberations . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Handling aggregated targets . . . . . . . . . . . . . . . . .   7
     6.1.  Deliberations . . . . . . . . . . . . . . . . . . . . . .   8
   7.  RPL Transit Information in DAO  . . . . . . . . . . . . . . .   8
     7.1.  Deliberations . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Managing persistent variables across node reboots . . . . . .   9
     8.1.  Persistent storage and RPL state information  . . . . . .   9
     8.2.  Lollipop Counters . . . . . . . . . . . . . . . . . . . .  10
     8.3.  RPL State variables . . . . . . . . . . . . . . . . . . .  11
       8.3.1.  DODAG Version . . . . . . . . . . . . . . . . . . . .  11
       8.3.2.  DTSN field in DIO . . . . . . . . . . . . . . . . . .  11
       8.3.3.  PathSequence  . . . . . . . . . . . . . . . . . . . .  11
     8.4.  State variables update frequency  . . . . . . . . . . . .  12
     8.5.  Deliberations . . . . . . . . . . . . . . . . . . . . . .  12
     8.6.  Implementation Notes  . . . . . . . . . . . . . . . . . .  12
   9.  RPL under-specification . . . . . . . . . . . . . . . . . . .  13
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  13
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     13.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Appendix A.  Additional Stuff . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Motivation

   The primary motivation for this draft is to enlist different issues
   with RPL operation and invoke a discussion within the working group.
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