NTP Leap Indicator. This is a two-bit code warning of an impending leap second to be inserted into the NTP timescale. The bits are set before 23:59 on the day of insertion and reset after 00:00 on the following day. This causes the number of seconds (rollover interval) in the day of insertion to be increased or decreased by one. In the case of primary servers the bits are set by operator intervention, while in the case of secondary servers the bits are set by the protocol. The two bits, bit 0 and bit 1, respectively, are coded as follows: =================================================== 00 no warning 01 last minute has 61 seconds 10 last minute has 59 seconds 11 alarm condition(clock not synchronized) =================================================== In all except the alarm condition(11), NTP itself does nothing with these bits, except pass them on to the time-conversion routines that are not part of NTP. The alarm condition occurs when, for whatever reason, the local clock is not synchronized, such as when first coming up or after an extended period when no primary reference source is available.