A DODAG Metric Used for DODAG Selection in Low-Power and Lossy Networks
draft-hushe-roll-dodag-metric-00

Document Type Active Internet-Draft (individual)
Authors Huimin She  , Li Zhao  , Pascal Thubert 
Last updated 2020-12-18
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ROLL                                                              H. She
Internet-Draft                                                   L. Zhao
Intended status: Standards Track                              P. Thubert
Expires: 21 June 2021                                      Cisco Systems
                                                        18 December 2020

A DODAG Metric Used for DODAG Selection in Low-Power and Lossy Networks
                    draft-hushe-roll-dodag-metric-00

Abstract

   This document extends [RFC6551] by defining a new DODAG metric called
   DODAG size, which can be used for DODAG selection in Low-Power and
   Lossy Networks (LLNs).  DODAG size is an important metric for nodes
   to decide which DODAG to join, or which DODAG to migrate.  This
   document proposes methods to disseminate DODAG size from the Root to
   all nodes in the DODAG, so that the DODAG size can be advertised to
   new joining nodes.

Status of This Memo

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   This Internet-Draft will expire on 21 June 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  References  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Disseminating DODAG size  . . . . . . . . . . . . . . . . . .   4
     3.1.  DODAG Size Object . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Disserminating DODAG size through DIO . . . . . . . . . .   5
     3.3.  Disserminating DODAG size through DAO-ACK . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   8.  Informative References  . . . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Low-power and Lossy Networks (LLNs) typically consist of large number
   of nodes connected by lossy and unstable links.  Such networks are
   typically compised of nodes that are constrained in CPU power,
   memory, and energy.

   RPL, the "Routing Protocol for LLNs" [RFC6550], is an IPv6 routing
   procotol with specific optimizations for such networks.  RPL builds
   routes proactively but maintains them on-demand based on their
   utilization.  Point-to-multipoint (P2MP) and multipoint-to-point
   (MP2P) routes to and from the Root are optimized, but other point-to-
   point (P2P) routes are stretched to minimize the control traffic and
   the state in every node.

   When used in conjunction with IEEE Std. 802.15.4 [IEEE802154], RPL
   can be used to form a Personal Area Network (PAN) composed by a
   6LoWPAN Border Router (6LBR) that is typically collocated with the
   DODAG Root, and multiple 6LoWPAN Nodes (6LN), that can be RPL routers
   of leaves.

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   The PAN formation process starts from a DODAG Root.  Before a node
   joins a PAN, it has no information regarding available neighbors or
   PANs.  To discover available PANs, a joining node transmits PAN
   Advertisement Solicits and listens for PAN Advertisements from either
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