Common Ancestor Objective Function and Parent Set DAG Metric Container Extension
draft-ietf-roll-nsa-extension-06

Document Type Active Internet-Draft (roll WG)
Last updated 2020-02-10
Replaces draft-koutsiamanis-roll-nsa-extension
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ROLL                                                R. Koutsiamanis, Ed.
Internet-Draft                                           G. Papadopoulos
Intended status: Standards Track                            N. Montavont
Expires: August 13, 2020                                  IMT Atlantique
                                                              P. Thubert
                                                                   Cisco
                                                       February 10, 2020

 Common Ancestor Objective Function and Parent Set DAG Metric Container
                               Extension
                    draft-ietf-roll-nsa-extension-06

Abstract

   Implementing Packet Replication and Elimination from/to the RPL root
   requires the ability to forward copies of packets over different
   paths via different RPL parents.  Selecting the appropriate parents
   to achieve ultra-low latency and jitter requires information about a
   node's parents.  This document details what information needs to be
   transmitted and how it is encoded within RPL control packets to
   enable this functionality.  This document also describes Objective
   Function which take advantage of this information to implement multi-
   path routing.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 13, 2020.

Copyright Notice

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

Koutsiamanis, et al.     Expires August 13, 2020                [Page 1]
Internet-Draft        CA OF and PS DAG MC Extension        February 2020

   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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Common Ancestor Objective Function  . . . . . . . . . . . . .   4
     3.1.  Common Ancestor Strict  . . . . . . . . . . . . . . . . .   6
     3.2.  Common Ancestor Medium  . . . . . . . . . . . . . . . . .   7
     3.3.  Common Ancestor Relaxed . . . . . . . . . . . . . . . . .   8
     3.4.  Usage . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  Node State and Attribute (NSA) object type extension  . . . .   8
     4.1.  Usage . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Controlling PRE . . . . . . . . . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  Informative references  . . . . . . . . . . . . . . . . .  11
     8.2.  Other Informative References  . . . . . . . . . . . . . .  12
   Appendix A.  Implementation Status  . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Network-enabled applications in the industrial context must provide
   stringent guarantees in terms of reliability and predictability.
   Packet Replication and Elimination (PRE)
   [I-D.papadopoulos-6tisch-pre-reqs] is a technique which allows
   redundant paths in the network to be utilized for traffic requiring
   higher reliability.  Allowing these kinds of applications to function
   over wireless networks requires the application of the principles of
   Deterministic Networking [I-D.ietf-detnet-architecture].  This
   results in designs which aim at optimizing packet delivery rate and
   bounding latency.  Additionally, given that the network nodes often
   do not have an unlimited power supply, energy consumption needs to be
   minimized as well.

   As an example, to meet this goal, IEEE Std. 802.15.4 [IEEE802154]
   provides Time-Slotted Channel Hopping (TSCH), a mode of operation
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