Root initiated routing state in RPL
draft-thubert-roll-dao-projection-00

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ROLL                                                     P. Thubert, Ed.
Internet-Draft                                              J. Pylakutty
Intended status: Standards Track                                   Cisco
Expires: December 31, 2015                                 June 29, 2015

                  Root initiated routing state in RPL
                    draft-thubert-roll-dao-projection-00

Abstract

   This document proposes a root-initiated protocol extension to RPL
   that enables to install a limited amount of downward routes in non-
   storing mode.  This enables loose source routing down the DODAG.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  New RPL Control Message Options . . . . . . . . . . . . . . .   4
     3.1.  Via Information . . . . . . . . . . . . . . . . . . . . .   5
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Routing Protocol for Low Power and Lossy Networks [RFC6550]
   (LLN)(RPL) specification defines a generic Distance Vector protocol
   that is indeed designed for very low energy consumption and adapted
   to a variety of LLNs.  RPL forms Destination Oriented Directed
   Acyclic Graphs (DODAGs) which root often acts as the Border Router to
   connect the RPL domain to the Internet.  The root is responsible to
   select the RPL Instance that is used to forward a packet coming from
   the Internet into the RPL domain and set the related RPL information
   in the packets.

   A classical RPL implementation in a very constrained LLN uses the
   non-storing mode of operation whereby a RPL node indicates a parent-
   child relationship to the root, using a Destination Advertisement
   Object (DAO) that is unicast from the node directly to the root, and
   the root builds a path to a destination down the DODAG by
   concatenating this information.

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              ------+---------
                    |          Internet
                    |
                 +-----+
                 |     | Border Router
                 |     |  (RPL Root)
                 +-----+                      ^     |        |
                    |                         | DAO | ACK    |
              o    o   o    o                 |     |        | Strict
          o o   o  o   o  o  o o   o          |     |        | Source
         o  o o  o o    o   o   o  o  o       |     |        | Route
         o   o    o  o     o  o    o  o  o    |     |        |
        o  o   o  o   o         o   o o       |     v        v
        o          o             o     o
                          LLN

                    Figure 1: RPL non-storing operation
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