Switch is not sync with NTP

[Mustafa Habibi]

Dears in support

I configured cisco 2960 switch with the command of ntp server X.X.X.X prefer but when I enter command of sh ntp status it shows me Clock is unsynchronized, stratum 16, no reference clock and in command of sh ntp association it shows 0.0.0.0 as a ref clock. when value shows - and poll value is 64. I can ping the ntp server as well and the local PC can sync with ntp and take time from it. your kindly assistance is appreciated.

Regards

[paul driver]

Hello

Does the ntp server have any acl prohibiting your host?

Is the any latency between the server and your host?

Any authentication required?

Debug ntp validity <---- check the sanity of the reason of this failure

res

Paul

[Mustafa Habibi]

Dear Paul

Switch does not have any ACL to block udp port 123(NTP), there is no latency between host and server and I did not config any authentication in switch side and if configuration is set in ntp side the local pc also should not taking time through ntp as I checked no authentication is required when we sync time in local pc. I turn it on all debug include validity by switch is not showing me any out put.

[johnd2310]

Hi,

What are you using as NTP server? Avoid using a Windows server as NTP as it uses SNTP which does not work well with other devices.

Are other switches synchronizing with that NTP server?

Thanks

John