The Minimum Rank with Hysteresis Objective Function
draft-ietf-roll-minrank-hysteresis-of-09

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Networking Working Group                                      O. Gnawali
Internet-Draft                                     University of Houston
Intended status: Standards Track                                P. Levis
Expires: October 24, 2012                            Stanford University
                                                          April 22, 2012

          The Minimum Rank with Hysteresis Objective Function
                draft-ietf-roll-minrank-hysteresis-of-09

Abstract

   The Routing Protocol for Low Power and Lossy Networks (RPL) uses
   objective functions to construct routes that optimize or constrain
   the routes it selects and uses.  This specification describes the
   Minimum Rank with Hysteresis Objective Function (MRHOF), an objective
   function that selects routes that minimize a metric, while using
   hysteresis to reduce churn in response to small metric changes.
   MRHOF works with metrics that are additive along a route, and the
   metric it uses is determined by the metrics RPL Destination
   Information Object (DIO) messages advertise.

Status of this Memo

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   This Internet-Draft will expire on October 24, 2012.

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   Copyright (c) 2012 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
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   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  The Minimum Rank with Hysteresis Objective Function  . . . . .  4
     3.1.  Computing the Path cost  . . . . . . . . . . . . . . . . .  4
     3.2.  Parent Selection . . . . . . . . . . . . . . . . . . . . .  5
       3.2.1.  When Parent Selection Runs . . . . . . . . . . . . . .  6
       3.2.2.  Parent Selection Algorithm . . . . . . . . . . . . . .  6
     3.3.  Computing Rank . . . . . . . . . . . . . . . . . . . . . .  7
     3.4.  Advertising the Path Cost  . . . . . . . . . . . . . . . .  8
     3.5.  Working Without Metric Containers  . . . . . . . . . . . .  8
   4.  Using MRHOF for Metric Maximization  . . . . . . . . . . . . .  9
   5.  MRHOF Variables and Parameters . . . . . . . . . . . . . . . .  9
   6.  Manageability  . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.1.  Device Configuration . . . . . . . . . . . . . . . . . . . 10
     6.2.  Device Monitoring  . . . . . . . . . . . . . . . . . . . . 11
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 12
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 12
     10.2. Informative References . . . . . . . . . . . . . . . . . . 13
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   An objective function specifies how RPL [RFC6550] selects paths.  For
   example, if an RPL instance uses an objective function that minimizes
   hop-count, RPL will select paths with minimum hop count.  RPL
   requires that all nodes in a network use a common OF; relaxing this
   requirement may be a subject of future study.

   The nodes running RPL might use a number of metrics to describe a
   link or a node [RFC6551] and make these metrics available for route
   selection.  RPL advertises metrics in RPL Destination Information
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