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An Optimization for the Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP) (RFC7466) Disclosure Number: IPCOM000240909D
Original Publication Date: 2015-Mar-01
Included in the Prior Art Database: 2015-Mar-12
Document File: 18 page(s) / 18K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Dearlove: AUTHOR [+1]


Section 14 of the MANET Neighborhood Discovery Protocol (NHDP) [RFC6130] contains a link admission mechanism known as "link quality" that allows a router using that protocol to "take considerations other than message exchange into account for determining when a link is and is not a candidate for being considered as HEARD or SYMMETRIC." Specifically, [RFC6130] permits a router to disallow consideration of some of its 1-hop neighbors for as long as the quality of the link from that 1-hop neighbor is below an acceptable link quality threshold.

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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)


   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 o...