Branch router clocks running slow

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  • Updated 5 years ago
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While looking at logs from one of our branch routers I noticed, it's clock was about 5 minutes slow. I dug further into the issue and found that in a sample of 5 of our branch routers, all the clocks were 5-15 minutes slow. They do have NTP configured (to HiveManager every day) and it does appear to correct itself and then start to drift again.

Also, when I rebooted a branch router as a test to see if it make an ntpclient connection on boot up, the clock went back to 1970-01-01 00:00:00 before ntpclient corrected the time.

Looking for suggestions and feedback how the clock should work.
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Fraser Hess

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  • unsure

Posted 5 years ago

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Mike Kouri, Official Rep

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Fraser,
Increase the frequency of your clock sync'ing. Personally, I do hourly.

The branch routers were designed to be Internet-attached equipment, and since we can get the internal clock sync'd with trustworthy external sources, we chose to reduce our costs by not putting a real-time-clock circuit into these devices.
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Nick Lowe, Official Rep

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If the drift is relatively constant on a per device basis, you could calibrate for it in software through NTP syncs that look at the drift deltas. It is probably more work than it is worth though and you could find the drift varies with temperature, or some other variable.

Yeah, just sync more often...