A Mechanism to Measure the Routing Metrics along a Point-to-Point Route in a Low-Power and Lossy Network
RFC 6998

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Internet Engineering Task Force (IETF)                     M. Goyal, Ed.
Request for Comments: 6998                  Univ. of Wisconsin Milwaukee
Category: Experimental                                       E. Baccelli
ISSN: 2070-1721                                                    INRIA
                                                               A. Brandt
                                                           Sigma Designs
                                                             J. Martocci
                                                        Johnson Controls
                                                             August 2013

A Mechanism to Measure the Routing Metrics along a Point-to-Point Route
                    in a Low-Power and Lossy Network

Abstract

   This document specifies a mechanism that enables a Routing Protocol
   for Low-power and Lossy Networks (RPL) router to measure the
   aggregated values of given routing metrics along an existing route
   towards another RPL router, thereby allowing the router to decide if
   it wants to initiate the discovery of a better route.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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/rfc6998.

Goyal, et al.                 Experimental                      [Page 1]
RFC 6998         Measurement of Routing Metrics in LLNs      August 2013

Copyright Notice

   Copyright (c) 2013 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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.

Goyal, et al.                 Experimental                      [Page 2]
RFC 6998         Measurement of Routing Metrics in LLNs      August 2013

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................5
   2. Overview ........................................................6
   3. The Measurement Object (MO) .....................................7
      3.1. Format of the Base MO ......................................8
      3.2. Secure MO .................................................12
   4. Originating a Measurement Request ..............................13
      4.1. When Measuring a Hop-by-Hop Route with a Global
           RPLInstanceID .............................................14
      4.2. When Measuring a Hop-by-Hop Route with a Local
           RPLInstanceID with Route Accumulation Off .................15
      4.3. When Measuring a Hop-by-Hop Route with a Local
           RPLInstanceID with Route Accumulation On ..................16
      4.4. When Measuring a Source Route .............................17
   5. Processing a Measurement Request at an Intermediate Point ......19
      5.1. When Measuring a Hop-by-Hop Route with a Global
           RPLInstanceID .............................................19
      5.2. When Measuring a Hop-by-Hop Route with a Local
           RPLInstanceID with Route Accumulation Off .................21
      5.3. When Measuring a Hop-by-Hop Route with a Local
           RPLInstanceID with Route Accumulation On ..................21
      5.4. When Measuring a Source Route .............................22
      5.5. Final Processing ..........................................23
   6. Processing a Measurement Request at the End Point ..............23
      6.1. Generating the Measurement Reply ..........................24
   7. Processing a Measurement Reply at the Start Point ..............25
   8. Security Considerations ........................................25
   9. IANA Considerations ............................................27
   10. Acknowledgements ..............................................27