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Versions: 00 01 02 03 draft-ietf-roll-turnon-rfc8138

ROLL                                                     P. Thubert, Ed.
Internet-Draft                                             Cisco Systems
Updates: 6550 (if approved)                                 May 23, 2019
Intended status: Standards Track
Expires: November 24, 2019


                   Configuration option for RFC 8138
                  draft-thubert-roll-turnon-rfc8138-00

Abstract

   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   unless the information is superseded by configuration.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 24, 2019.

Copyright Notice

   Copyright (c) 2019 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  BCP 14  . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Updating RFC 6550 . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   3
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

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.






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4.  Operation

   A node that supports this specification SHOULD source packets in the
   compressed form using [RFC8138] if the new T flag is set in the RPL
   configuration option from its parents.  Failure to do so will result
   in larger packets, yields higher risks of loss and may cause a
   fragmentation.

   A node that supports this specification SHOULD refrain from sourcing
   packets in the compressed form using [RFC8138] if the T flag is
   reset.  This behaviour can be overridden by a configuration of the
   node in order to cope with intermediate implementations of the root
   that support [RFC8138] but not this specification and cannot set the
   T flag.

   Regardless of the setting of the bit, the node MUST forward a packet
   in the form it was received, compressed or uncompressed.

5.  IANA Considerations

   This specification updates the "Registry for the DODAG Configuration
   Option Flags" that was created for [RFC6550] as follows:

     +---------------+---------------------------------+-------------+
     |   Bit number  |         Suggested value         |  Defined in |
     +---------------+---------------------------------+-------------+
     | 2 (suggested) | Turn on RFC8138 Compression (T) |   This RFC  |
     +---------------+---------------------------------+-------------+

               Table 1: New DODAG Configuration Option Flag

6.  Security Considerations

   No specific threat was identified with this specification.

7.  Acknowledgments

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.






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   [RFC6550]  Winter, T., Ed., Thubert, P., Ed., Brandt, A., Hui, J.,
              Kelsey, R., Levis, P., Pister, K., Struik, R., Vasseur,
              JP., and R. Alexander, "RPL: IPv6 Routing Protocol for
              Low-Power and Lossy Networks", RFC 6550,
              DOI 10.17487/RFC6550, March 2012,
              <https://www.rfc-editor.org/info/rfc6550>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

8.2.  Informative References

   [RFC8138]  Thubert, P., Ed., Bormann, C., Toutain, L., and R. Cragie,
              "IPv6 over Low-Power Wireless Personal Area Network
              (6LoWPAN) Routing Header", RFC 8138, DOI 10.17487/RFC8138,
              April 2017, <https://www.rfc-editor.org/info/rfc8138>.

Author's Address

   Pascal Thubert (editor)
   Cisco Systems, Inc
   Building D
   45 Allee des Ormes - BP1200
   MOUGINS - Sophia Antipolis  06254
   FRANCE

   Phone: +33 497 23 26 34
   Email: pthubert@cisco.com






















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