Link Metrics for the Mobile Ad Hoc Network (MANET) Routing Protocol OLSRv2 - Rationale
RFC 7185

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Internet Engineering Task Force (IETF)                       C. Dearlove
Request for Comments: 7185                               BAE Systems ATC
Category: Informational                                       T. Clausen
ISSN: 2070-1721                                 LIX, Ecole Polytechnique
                                                              P. Jacquet
                                                Alcatel-Lucent Bell Labs
                                                              April 2014

                 Rationale for the Use of Link Metrics
    in the Optimized Link State Routing Protocol Version 2 (OLSRv2)

Abstract

   The Optimized Link State Routing Protocol version 2 (OLSRv2) includes
   the ability to assign metrics to links and to use those metrics to
   allow routing by other than minimum hop count routes.  This document
   provides a historic record of the rationale for, and design
   considerations behind, how link metrics were included in OLSRv2.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7185.

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Dearlove, et al.              Informational                     [Page 1]
RFC 7185                   OLSRv2 Link Metrics                April 2014

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
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Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................5
   3. Applicability ...................................................5
   4. Motivational Scenarios ..........................................5
   5. Link Metrics ....................................................7
      5.1. Link Metric Properties .....................................7
      5.2. Link Metric Types ..........................................8
      5.3. Directional Link Metrics ..................................10
      5.4. Reporting Link and Neighbor Metrics .......................10
      5.5. Defining Incoming Link Metrics ............................12
      5.6. Link Metric Values ........................................12
   6. MPRs with Link Metrics .........................................14
      6.1. Flooding MPRs .............................................14
      6.2. Routing MPRs ..............................................16
      6.3. Relationship between MPR Sets .............................19
   7. Security Considerations ........................................21
   8. Acknowledgements ...............................................21
   9. Informative References .........................................21
   Appendix A.  MPR Routing Property .................................23

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RFC 7185                   OLSRv2 Link Metrics                April 2014

1.  Introduction

   The Optimized Link State Routing Protocol version 1 (OLSRv1)
   [RFC3626] is a proactive routing protocol for mobile ad hoc networks
   (MANETs) [RFC2501].  OLSRv1 finds the shortest, defined as minimum