Setup
I have a setup with 2 routers acting like NTP servers for an NTP client (Meinberg NTP) installed on a test server on the network. I have been synchronizing with both servers but after experiencing weird behavior, I switched to only use a single NTP server to synchronize with to be able to debug a problem I seem to have.
It seems, that the offset varies a hole lot during the day and it has values between (+10ms and -150ms). This is way off and much much more than the required values for our setup wich is a few ms a maximum.
Screenshots of statistics
I have configured the NTP Client to drop log files with statistics and then I have used a graphical dot print tool to create some graphs of the offset, jitter etc. over time. The following shows the average time of the logfile for today:
Overview statistics
Following are the offset graph, the delay, dispersion and the jitter graphs:
Offset
Delay
Dispersion
Jitter
My observations
It seems that four times today there have been some remarkable spikes on the graphs. And each time a spike has occured, that offset seems to be in sync, hitting a very few ms offset. But then it seems to be drifting away again.
The NTP Client has been running for a week, so I would expect any initial calibrations to be done.
Does anyone have the abilities to point out some obvious reasons for this behavior?
Thankyou in advance!
I found out, that the NTP servers I was synchronizing with, had delayed responses depending on the load on the servers. After correcting this to have a higher priority for the NTP servers, the problem was gone.