IPv6 over Low-Power Wireless Personal Area Network (6LoWPAN) ESC Dispatch Code Points and Guidelines
RFC 8066

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Internet Engineering Task Force (IETF)                    S. Chakrabarti
Request for Comments: 8066
Updates: 4944, 6282                                        G. Montenegro
Category: Standards Track                                      Microsoft
ISSN: 2070-1721                                                 R. Droms

                                                             J. Woodyatt
                                                                  Google
                                                           February 2017

      IPv6 over Low-Power Wireless Personal Area Network (6LoWPAN)
                ESC Dispatch Code Points and Guidelines

Abstract

   RFC 4944 defines the ESC dispatch type to allow additional dispatch
   octets in the 6LoWPAN header.  The value of the ESC dispatch type was
   updated by RFC 6282; however, its usage was not defined in either RFC
   6282 or RFC 4944.  This document updates RFC 4944 and RFC 6282 by
   defining the ESC extension octet code points and listing registration
   entries for known use cases at the time of writing of this document.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8066.

Chakrabarti, et al.          Standards Track                    [Page 1]
RFC 8066            6LoWPAN ESC Dispatch Code Points       February 2017

Copyright Notice

   Copyright (c) 2017 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
   (http://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 and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Usage of ESC Dispatch Octets  . . . . . . . . . . . . . . . .   3
     3.1.  Interaction with Other RFC 4944 Implementations . . . . .   4
     3.2.  ESC Extension Octets Typical Sequence . . . . . . . . . .   5
     3.3.  ITU-T G.9903 ESC Type Usage . . . . . . . . . . . . . . .   6
     3.4.  NALP and ESC Dispatch Types . . . . . . . . . . . . . . .   6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

Chakrabarti, et al.          Standards Track                    [Page 2]
RFC 8066            6LoWPAN ESC Dispatch Code Points       February 2017

1.  Introduction

   Section 5.1 of [RFC4944] defines the dispatch header and types.  The
   ESC type is defined to use additional dispatch octets in the 6LoWPAN
   header.  RFC 6282 modifies the value of the ESC dispatch type and
   that value is recorded in IANA registry [IANA-6LoWPAN].  However, the
   octets and usage following the ESC dispatch type are not defined in
   either [RFC4944] or [RFC6282].  In recent years with 6LoWPAN
   deployments, implementations and standards organizations have started
   using the ESC extension octets.  This highlights the need for an
   updated IANA registration policy.

   This document defines the new "ESC Extension Types" registry and the
   ESC extension octets for future applications.  In addition, this
   document records the ITU-T specification for ESC dispatch octet code
   points as an existing known usage.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Usage of ESC Dispatch Octets

   RFC 4944 [RFC4944] first introduces this "ESC" dispatch header type
   for extension of dispatch octets.  RFC 6282 [RFC6282] subsequently