MPL Forwarder Select (MPLFS)
draft-ietf-roll-mpl-forw-select-00

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Last updated 2016-12-07
Replaces draft-vanderstok-roll-mpl-forw-select
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roll                                                     P. van der Stok
Internet-Draft                                                consultant
Intended status: Standards Track                               AR. Sangi
Expires: June 10, 2017                               Huawei Technologies
                                                        December 7, 2016

                      MPL Forwarder Select (MPLFS)
                   draft-ietf-roll-mpl-forw-select-00

Abstract

   This document describes a Forwarder Selection (MPLFS) protocol for
   the Multicast Protocol for Low-Power and lossy Networks (MPL) to
   reduce the density of forwarders such that the number of forwarded
   messages is reduced.

   The protocol uses Trickle to distribute link-local information about
   the identity of the neighbours of the nodes that have MPL-enabled
   interfaces.  In the end-state all nodes are connected to a minimum
   number, N_DUPLICATE, of forwarders, where N_DUPLICATE is application
   dependent, and there is a path between any two forwarders.

Note

   Discussion and suggestions for improvement are requested, and should
   be sent to roll@ietf.org.

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 June 10, 2017.

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Copyright Notice

   Copyright (c) 2016 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
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   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
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol overview . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Data sets . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Neighbor distribution . . . . . . . . . . . . . . . . . . . .   5
   5.  Selection Algorithm . . . . . . . . . . . . . . . . . . . . .   6
   6.  CBOR payload  . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Default parameter values  . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Appendix A.  example forwarder allocations  . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Multicast Protocol for Low-Power and Lossy Networks (MPL)
   [RFC7731] is designed for small devices interconnected by a lossy
   wireless network such as IEEE 802.15.4.  A seed sends a multicast
   message with a realm-local scope, admin-local scope or higher as
   specified in [RFC4291].

   Forwarders forward these messages with an increasing interval size.
   When the density of the forwarders is high, the DATA_MESSAGE_K (k)
   parameter stops the retransmission of messages in a given Trickle
   interval when more than k copies of a message have been received.
   This mechanism prevents network saturation but leads to difficult to
   predict end-to-end data transmission delays.  For IoT short
   predictable delays are wanted and the k parameter is set to a large

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   value.  When the density of forwarders is high and k is large, the
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