{"draft":"draft-ietf-roll-rnfd-07","doc_id":"RFC9866","title":"Root Node Failure Detector (RNFD): Fast Detection of Border Router Crashes in the Routing Protocol for Low-Power and Lossy Networks (RPL)","authors":["K. Iwanicki"],"format":["HTML","TEXT","PDF","XML"],"page_count":"22","pub_status":"PROPOSED STANDARD","status":"PROPOSED STANDARD","source":"Routing Over Low power and Lossy networks","abstract":"By and large, correct operation of a network running the Routing\r\nProtocol for Low-Power and Lossy Networks (RPL) requires border\r\nrouters to be up. In many applications, it is beneficial for the\r\nnodes to detect a failure of a border router as soon as possible to\r\ntrigger fallback actions. This document specifies the Root Node\r\nFailure Detector (RNFD), an extension to RPL that expedites detection\r\nof border router crashes by having nodes collaboratively monitor the\r\nstatus of a given border router. The extension introduces an\r\nadditional state at each node, a new type of RPL Control Message\r\nOption for synchronizing this state among different nodes, and the\r\ncoordination algorithm itself.","pub_date":"October 2025","keywords":[],"obsoletes":[],"obsoleted_by":[],"updates":[],"updated_by":[],"see_also":[],"doi":"10.17487\/RFC9866","errata_url":null}