Mode of Operation extension
draft-ietf-roll-mopex-01

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Last updated 2020-06-05
Replaces draft-jadhav-roll-mopex
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ROLL                                                      R. Jadhav, Ed.
Internet-Draft                                               Huawei Tech
Intended status: Standards Track                              P. Thubert
Expires: December 7, 2020                                          Cisco
                                                           M. Richardson
                                                Sandelman Software Works
                                                            June 5, 2020

                      Mode of Operation extension
                        draft-ietf-roll-mopex-01

Abstract

   RPL allows different mode of operations which allows nodes to have a
   consensus on the basic primitives that must be supported to join the
   network.  The MOP field in [RFC6550] is of 3 bits and is fast
   depleting.  This document extends the MOP for future use.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 7, 2020.

Copyright Notice

   Copyright (c) 2020 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
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   include Simplified BSD License text as described in Section 4.e of

Jadhav, et al.          Expires December 7, 2020                [Page 1]
Internet-Draft                MOP extension                    June 2020

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language and Terminology . . . . . . . . . .   3
   2.  Requirements for this document  . . . . . . . . . . . . . . .   3
   3.  Extended MOP Control Message Option . . . . . . . . . . . . .   4
     3.1.  Handling MOPex  . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Use of values 0-6 in the MOPex option . . . . . . . . . .   4
   4.  Extending RPL Control Options . . . . . . . . . . . . . . . .   4
   5.  Implementation Considerations . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Mode of operation: MOPex  . . . . . . . . . . . . . . . .   6
     7.2.  New options: MOPex and Capabilities . . . . . . . . . . .   6
     7.3.  New Registry for Extended-MOP-value . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   RPL [RFC6550] specifies a proactive distance-vector based routing
   scheme.  The protocol creates a DAG-like structure which operates
   with a given "Mode of Operation" (MOP) determining the minimal and
   mandatory set of primitives to be supported by all the participating
   nodes.

   MOP as per [RFC6550] is a 3-bit value carried in DIO messages and is
   specific to the RPL Instance.  The receipient of the DIO message can
   join the specified network as a router only when it can support the
   primitives as required by the mode of operation value.  For example,
   in case of MOP=3 (Storing MOP with multicast support) the nodes can
   join the network as routers only when they can handle the DAO
   advertisements from the peers and manage routing tables.  The 3-bit
   value is already exhausted and requires replenishment.  This document
   introduces a mechanism to extend mode of operation values.

   This document further extends the RPL Control Option syntax to handle
   generic flags.  The primary aim of these flags is to define the
   behaviour of a node not supporting the given control type.  If a node
   does not support a given RPL Control Option, there are three
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