[ntp:questions] NTP on LAN
david at ex.djwhome.demon.co.uk.invalid
Mon Sep 29 06:56:07 UTC 2008
David L. Mills wrote:
> I'm not sure which configuration you are considering; the documentation
> clearly shows, even in the diagrams, that there can be more than one
Steve, rather than I, was proposing a configuration in which there was
one orphan mode server and one normal client. I have no problem with
the use of orphan mode with multiple servers at the same orphan level.
> orphan server and more than one orphan client. The expressed intent is
> that, should all sources of time be lost, that onlyu all orphan clients
> select the same orphan server. It's as simple as that.
> Orphan mode was motivated by certain misguided configurations that tried
> to engineer failover configurations using engineered local clock stratum
> assignments. These are dangerous, fragile and will form loops unless
Steve was talking about engineering a failover precedence arrangement by
engineering the orphan strata to all be different.
> specifically and carefully done. Usually under some failure scenario or
> other a cycle forms between two local clocks and in the best
> Bellman-Ford tradition, they count to infinity.
> Orphan mode was specifically designed for the most common case where a
> LAN has multiple Internet servers and where one or more of them can
> become disconnected. The (single) orphan server becoms the source of
> last resort.
I'm not sure if you mean single in a static or dynamic s sense. The
documentation indicates benefits when it is a dynamic sense, but doesn't
seem to indicate any real difference from the local clock solution when
there is never more than one candidate.
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