[ntp:questions] NTP Peer Keeps Swapping on Start-up

Steve Kostecke kostecke at ntp.org
Mon Oct 4 16:57:42 UTC 2010

On 2010-10-04, Rob <nomail at example.com> wrote:
> SteveW <qsw000 at email.mot.com> wrote:
>> I am seeing a case where one board in my system keeps switching its
>> peer back and forth between its local clock and a remote ntp server
>> for about 40 minutes when it first comes up.  Eventually, it correctly
>> starts using the remote ntp server.
> It is advisable to just remove this "local clock" from your config.

Because the Undisciplined Local Clock (127.127.1.x) is not a "backup
time source" for a leaf-node (i.e. a pure client ntpd).

The Undisciplined Local Clock allows an ntpd which must serve time to
others to always claim to be synced to something (even when it's really

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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