RFC 5905, "Network Time Protocol Version 4: Protocol and Algorithms Specification", June 2010Source of RFC: ntp (int)
Errata ID: 4366
Status: Held for Document Update
Publication Format(s) : TEXT
Reported By: Vyacheslav
Date Reported: 2015-05-13
Held for Document Update by: Brian Haberman
Date Held: 2015-09-14
Section 11.2.1 says:
5. Is d = f and l < u? If yes, then follow step 5A; else, follow step 5B.
It should say:
5. Is d <= f and l < u? If yes, then follow step 5A; else, follow step 5B.
Original text doesn't correspond to sample implementation at A.5.5.1. And, I suppose, described algorithm may throw out reasonable set of measures.