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Just a quick note behind NTP theory,
NTP Servers / NTP Sync Servers are used to synchronize the device's system time with a reference time source.
These reference time sources are very precision Atomic clocks and called "Stratum 0" in NTP terminology.
The network devices have inexpensive less accurate clocks which may deviate from these reference clocks after some period of time, even though we set it correctly.
Stratum 1 NTP servers will get the reference time from Stratum 0 and Startum 2 will get from Startum 1...
When we configure NTP Syn server in our devices, whenever the device's system clock deviates from the actual time, It uses NTP servers synchronisation to correct the time offset.
This offset should be small, otherwise the device will not accept the NTP server's update.
Example, if the device is having 5.00 AM and the actual NTP time is 10.00 AM, then it won't sync with NTP, believing that something wrong with the time.
Therefore, when a device boots, the time should be atleast close to the NTP server time. In other words, the offset should be minimum, so that the synchronisation can occur.
NTP Boot Server does this job by giving the correct time when a device boots.
Answering your questions directly
if i m using ntp boot server to get time from a server,,, then is not it good enough???
do i need still another device to sync time with.... what if i dont use any ntp sync server???
Initial time will be correct, but over the period of time, the device time will deviate from global time reference source.
what if i only use ntp server to sync time with and no boot server,,, does that mean i dont get time at boot time,, but later on , the ntp server will keep giving me synced time????
If your device time offset is large, it won't be able to Sync with NTP server. So your time will be wrong.
Boot server and NTP Sync server should work properly, if you have configured correctly.
Hope this explains.
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Thanks Moss 🙂
Your answers clears my query too 🙂