An Optimization for the Mobile Ad Hoc Network (MANET) Neighborhood Discovery Protocol (NHDP) (RFC7466)
Original Publication Date: 2015-Mar-01
Included in the Prior Art Database: 2015-Mar-12
Internet Society Requests For Comment (RFCs)
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.
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".
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.
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