An Optimization for the Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP)
RFC 7466

Document Type RFC - Proposed Standard (March 2015; No errata)
Last updated 2015-10-14
Replaces draft-dearlove-manet-nhdp-optimization
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Stream WG state Submitted to IESG for Publication
Document shepherd Ulrich Herberg
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IESG IESG state RFC 7466 (Proposed Standard)
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Responsible AD Adrian Farrel
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                       C. Dearlove
Request for Comments: 7466                               BAE Systems ATC
Updates: 6130, 7181                                           T. Clausen
Category: Standards Track                       LIX, Ecole Polytechnique
ISSN: 2070-1721                                               March 2015

         An Optimization for the Mobile Ad Hoc Network (MANET)
                 Neighborhood Discovery Protocol (NHDP)

Abstract

   The link quality mechanism of the Mobile Ad Hoc Network (MANET)
   Neighborhood Discovery Protocol (NHDP) enables "ignoring" some 1-hop
   neighbors if the measured link quality from that 1-hop neighbor is
   below an acceptable threshold while still retaining the corresponding
   link information as acquired from the HELLO message exchange.  This
   allows immediate reinstatement of the 1-hop neighbor if the link
   quality later improves sufficiently.

   NHDP also collects information about symmetric 2-hop neighbors.
   However, it specifies that if a link from a symmetric 1-hop neighbor
   ceases being symmetric, including while "ignored" (as described
   above), then corresponding symmetric 2-hop neighbors are removed.
   This may lead to symmetric 2-hop neighborhood information being
   permanently removed (until further HELLO messages are received) if
   the link quality of a symmetric 1-hop neighbor drops below the
   acceptable threshold, even if only for a moment.

   This specification updates RFC 6130 "Mobile Ad Hoc Network (MANET)
   Neighborhood Discovery Protocol (NHDP)" and RFC 7181 "The Optimized
   Link State Routing Protocol Version 2 (OLSRv2)" to permit, as an
   option, retaining, but ignoring, symmetric 2-hop information when the
   link quality from the corresponding 1-hop neighbor drops below the
   acceptable threshold.  This allows immediate reinstatement of the
   symmetric 2-hop neighbor if the link quality later improves
   sufficiently, thus making the symmetric 2-hop neighborhood more
   "robust".

Dearlove & Clausen           Standards Track                    [Page 1]
RFC 7466                    NHDP Optimization                 March 2015

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc7466.

Copyright Notice

   Copyright (c) 2015 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.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Applicability Statement .........................................4
   4. Changes to NHDP .................................................4
      4.1. Interface Information Bases ................................5
      4.2. HELLO Message Processing ...................................5
      4.3. Information Base Changes ...................................5
      4.4. Constraints ................................................6
   5. Changes to OLSRv2 ...............................................6
   6. Security Considerations .........................................8
   7. References ......................................................8
      7.1. Normative References .......................................8
      7.2. Informative References .....................................8
   Acknowledgements ...................................................9
   Authors' Addresses .................................................9

Dearlove & Clausen           Standards Track                    [Page 2]
RFC 7466                    NHDP Optimization                 March 2015
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