Transmission of IPv6 over MS/TP Networks
draft-ietf-6lo-6lobac-08

Document Type Active Internet-Draft (6lo WG)
Last updated 2017-03-17 (latest revision 2017-03-13)
Replaces draft-ietf-6man-6lobac
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Stream WG state Submitted to IESG for Publication Mar 2015
Document shepherd Samita Chakrabarti
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RFC Editor RFC Editor state EDIT
6Lo Working Group                                           K. Lynn, Ed.
Internet-Draft                                              Verizon Labs
Intended status: Standards Track                             J. Martocci
Expires: September 11, 2017                             Johnson Controls
                                                              C. Neilson
                                                          Delta Controls
                                                            S. Donaldson
                                                               Honeywell
                                                          March 10, 2017

                Transmission of IPv6 over MS/TP Networks
                        draft-ietf-6lo-6lobac-08

Abstract

   Master-Slave/Token-Passing (MS/TP) is a medium access control method
   for the RS-485 physical layer and is used primarily in building
   automation networks.  This specification defines the frame format for
   transmission of IPv6 packets and the method of forming link-local and
   statelessly autoconfigured IPv6 addresses on MS/TP networks.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 11, 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

Lynn, et al.           Expires September 11, 2017               [Page 1]
Internet-Draft          IPv6 over MS/TP (6LoBAC)              March 2017

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Profile for IPv6 over MS/TP . . . . . . . . . . . . . . . . .   5
   3.  Addressing Modes  . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Maximum Transmission Unit (MTU) . . . . . . . . . . . . . . .   7
   5.  LoBAC Adaptation Layer  . . . . . . . . . . . . . . . . . . .   7
   6.  Stateless Address Autoconfiguration . . . . . . . . . . . . .   8
   7.  IPv6 Link Local Address . . . . . . . . . . . . . . . . . . .   9
   8.  Unicast Address Mapping . . . . . . . . . . . . . . . . . . .   9
   9.  Multicast Address Mapping . . . . . . . . . . . . . . . . . .  10
   10. Header Compression  . . . . . . . . . . . . . . . . . . . . .  10
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Appendix A.  Abstract MAC Interface . . . . . . . . . . . . . . .  14
   Appendix B.  Consistent Overhead Byte Stuffing [COBS] . . . . . .  17
   Appendix C.  Encoded CRC-32K [CRC32K] . . . . . . . . . . . . . .  20
   Appendix D.  Example 6LoBAC Frame Decode  . . . . . . . . . . . .  22
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   Master-Slave/Token-Passing (MS/TP) is a medium access control (MAC)
   protocol for the RS-485 [TIA-485-A] physical layer and is used
   primarily in building automation networks.  This specification
   defines the frame format for transmission of IPv6 [RFC2460] packets
   and the method of forming link-local and statelessly autoconfigured
   IPv6 addresses on MS/TP networks.  The general approach is to adapt
   elements of the 6LoWPAN specifications [RFC4944], [RFC6282], and
   [RFC6775] to constrained wired networks, as noted below.

   An MS/TP device is typically based on a low-cost microcontroller with
   limited processing power and memory.  These constraints, together
   with low data rates and a small MAC address space, are similar to
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