MPL Forwarder Select (MPLFS)
draft-ietf-roll-mpl-forw-select-00
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.
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This Internet-Draft will expire on June 10, 2017.
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Copyright Notice
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document authors. All rights reserved.
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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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