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RFC 9866: Root Node Failure Detector (RNFD): Fast Detection of Border Router Crashes in the Routing Protocol for Low-Power and Lossy Networks (RPL)

In plain English — editorial summary, not part of the RFC

By and large, correct operation of a network running the Routing Protocol for Low-Power and Lossy Networks (RPL) requires border routers to be up. In many applications, it is beneficial for the nodes to detect a failure of a border router as soon as possible to trigger fallback actions. This document specifies the Root Node Failure Detector (RNFD), an extension to RPL that expedites detection of border router crashes by having nodes collaboratively monitor the status of a given border router. The extension introduces an additional state at each node, a new type of RPL Control Message Option for synchronizing this state among different nodes, and the coordination algorithm itself.

Document record

Document ID
RFC9866
Published
October 2025
Authors
K. Iwanicki
Status
PROPOSED STANDARD
Stream
IETF
Area
rtg
Pages
22
Also known as
—

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

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canonical URL: /rfc/9866-root-node-failure-detector-rnfd-fast-detection-of-border-router-crashes-in-the-r