[ntp:questions] Leap Second Handling
Martin Burnicki
martin.burnicki at meinberg.de
Thu Nov 6 13:15:48 UTC 2008
PeterInFrankfurt at gmail.com wrote:
> Can anyone clarify how the leap second is supposed to work?
>
> We have a GPS receiver which, I understand, already receives the leap
> second indicator LI and knows the leap second will happen end of 2008
> UTC time.
>
> This GPS receiver speaks IRIG-B with IEEE 1344 extensions to our Time
> Server. IEEE 1344 definition says the Leap Second Pending is set in
> the 59 seconds before the leap second happens.
>
> So our Time Server will know nothing about the leap second until 59s
> before the year end. By which time, NTP propagation down through the
> stratum hierarchy will fail to notify all NTP clients before the year
> end.
>
> In this scenario is it necessary to manually insert the leap second
> into the Time Server?
You can download and install the NIST leap second file on your NTP server.
See:
http://support.ntp.org/bin/view/Support/ConfiguringNTP#Section_6.12.
Be sure autokey is enabled since otherwwise the leap second file is not
evaluated.
Martin
--
Martin Burnicki
Meinberg Funkuhren
Bad Pyrmont
Germany
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