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Status:

PROPOSED STANDARD

Updates:

RFC 6130,RFC 7181

Authors:

C. Dearlove
T. Clausen

Stream:

IETF

Source:

manet (rtg)

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DOI:  https://doi.org/10.17487/RFC7466

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Abstract

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

NHDP also collects information about symmetric 2-hop neighbors.However, it specifies that if a link from a symmetric 1-hop neighborceases being symmetric, including while "ignored" (as describedabove), then corresponding symmetric 2-hop neighbors are removed.This may lead to symmetric 2-hop neighborhood information beingpermanently removed (until further HELLO messages are received) ifthe link quality of a symmetric 1-hop neighbor drops below theacceptable 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 OptimizedLink State Routing Protocol Version 2 (OLSRv2)" to permit, as anoption, retaining, but ignoring, symmetric 2-hop information when thelink quality from the corresponding 1-hop neighbor drops below theacceptable threshold. This allows immediate reinstatement of thesymmetric 2-hop neighbor if the link quality later improvessufficiently, thus making the symmetric 2-hop neighborhood more"robust".

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.