A RPL DODAG Configuration Option for the 6LoWPAN Routing Header
draft-ietf-roll-turnon-rfc8138-18

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ROLL                                                     P. Thubert, Ed.
Internet-Draft                                                   L. Zhao
Updates: 8138 (if approved)                                Cisco Systems
Intended status: Standards Track                        18 December 2020
Expires: 21 June 2021

    A RPL DODAG Configuration Option for the 6LoWPAN Routing Header
                   draft-ietf-roll-turnon-rfc8138-18

Abstract

   This document updates RFC 8138 by defining a bit in the RPL DODAG
   Configuration Option to indicate whether compression is used within
   the RPL Instance, and specify the behavior of RFC 8138-capable nodes
   when the bit is set and unset.

Status of This Memo

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   This Internet-Draft will expire on 21 June 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
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Thubert & Zhao            Expires 21 June 2021                  [Page 1]
Internet-Draft                Turn On 6LoRH                December 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  References  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Extending RFC 6550  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Updating RFC 8138 . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Transition Scenarios  . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Coexistence . . . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  Inconsistent State While Migrating  . . . . . . . . . . .   6
     5.3.  Rolling Back  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   10. Informative References  . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The design of Low Power and Lossy Networks (LLNs) is generally
   focused on saving energy, which is the most constrained resource of
   all.  The routing optimizations in the "Routing Protocol for Low
   Power and Lossy Networks" [RFC6550] (RPL) such as routing along a
   Destination-Oriented Directed Acyclic Graph (DODAG) to a Root Node
   and the associated routing header compression and forwarding
   technique specified in [RFC8138] derive from that primary concern.

   Enabling [RFC8138] on a running network requires a Flag Day where the
   network is upgraded and rebooted.  Otherwise, if acting as a Leaf, a
   node that does not support the compression would fail to communicate;
   if acting as a router it would drop the compressed packets and black-
   hole a portion of the network.  This specification enables a hot
   upgrade where a live network is migrated.  During the migration, the
   compression remains inactive, until all nodes are upgraded.

   This document complements [RFC8138] and signals whether it should be
   used within a RPL DODAG with a new flag in the RPL DODAG
   Configuration Option.  The setting of this new flag is controlled by
   the Root and propagates as is in the whole network as part of the
   normal RPL signaling.

   The flag is cleared to maintain the compression inactive during the
   migration phase.  When the migration is complete (e.g., as known by
   network management and/or inventory), the flag is set and the