Configuration option for RFC 8138
draft-ietf-roll-turnon-rfc8138-02

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Document Type Active Internet-Draft (roll WG)
Last updated 2019-12-12
Replaces draft-thubert-roll-turnon-rfc8138
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ROLL                                                     P. Thubert, Ed.
Internet-Draft                                                   L. Zhao
Updates: 6550, 8138 (if approved)                          Cisco Systems
Intended status: Standards Track                        12 December 2019
Expires: 14 June 2020

                   Configuration option for RFC 8138
                   draft-ietf-roll-turnon-rfc8138-02

Abstract

   This document complements RFC 8138 and dedicates a bit in the RPL
   configuration option defined in RFC 6550 to indicate whether RFC 8138
   compression is used within the RPL instance.

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
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   This Internet-Draft will expire on 14 June 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Thubert & Zhao            Expires 14 June 2020                  [Page 1]
Internet-Draft              Enabling RFC 8138              December 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  BCP 14  . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Updating RFC 6550 . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Updating RFC 8138 . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Transition Scenarios  . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Inconsistent State While Migrating  . . . . . . . . . . .   4
     5.2.  Single Instance Scenario  . . . . . . . . . . . . . . . .   5
     5.3.  Double Instance Scenario  . . . . . . . . . . . . . . . .   6
     5.4.  Rolling Back  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   7
   10. Informative References  . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The transition to [RFC8138] in a network can only be done when all
   nodes support the specification.  In a mixed case with both
   RFC8138-capable and non-capable nodes, the compression should be
   turned off.

   This document complements RFC 8138 and dedicates a bit in the RPL
   configuration option to indicate whether RFC 8138 compression should
   be used within the RPL instance.  When the bit is not set, source
   nodes that support RFC 8138 should refrain from using the compression
   unless the information is superseded by configuration.

2.  BCP 14

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119][RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Updating RFC 6550

   RPL defines a configuration option that is registered to IANA in
   section 20.14. of [RFC6550].  This specification defines a new flag
   "Enable RFC8138 Compression" (T) that is encoded in one of the
   reserved control bits in the option.  The new flag is set to turn on
   the use of the compression of RPL artifacts with RFC 8138.  The bit
   position of the "T" flag is indicated in Section 6.

Thubert & Zhao            Expires 14 June 2020                  [Page 2]
Internet-Draft              Enabling RFC 8138              December 2019

   Section 6.3.1.  of [RFC6550] defines a 3-bit Mode of Operation (MOP)
   in the DIO Base Object.  The new "T" flag is defined only for MOP
   value between 0 to 6.  For a MOP value of 7 or above, the flag MAY
   indicate something different and MUST NOT be interpreted as "Enable
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