Jun Hu wrote:


     remote                      refid            st t when poll reach   delay  
   offset      jitter
==============================================================================
*192.168.227.148 LOCAL(0)        12 u  197      64  370       0.205   36.638   
2.993




My expected is that the "*" should be disappeared after Server A shutdown , Is it right?

why does asterisk still show after the ntp server is shutdown?

You've only lost three of the last 8 samples from that server. You will have to wait until there are rather less recent samples available before it gets disqualified.

Also, I have a feeling that, if it is the only one, it may stay selected until the root dispersion grows too large, as it was the last valid system peer and the estimated error is still acceptable (downstream systems can make their own judgements, based on root dispersion, as to whether or not to trust it).

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