NTP auto disconnect every week (sunday)

[posemman]

Hi, 

May I ask if you encountered auto disconnect to NTP server?

Our cisco C2960-LANBASEK9-M always disconnect every Sunday, our temporary solution is to reboot it. After reboot it will back to normal connection, and the NTP synchronized. 

 

[Georg Pauwen]

Hello,

what device is 172.27.1.9 ?

[posemman]

Hi Georg,

It's our monitoring server. Linux based.

[Leo Laohoo]

Sounds like an IOS bug to me. What IOS version is the switch running on?
Is this the only switch having this problem? How about others (running different IOS version)?

[posemman]

It is Version 15.0(2)SE4. Yes this is the only switch having a problem. 

5 other cisco switches were connected to this switch. 

[Leo Laohoo]

I've used 15.0(2)SE4 for years. Very, very stable. I have never seen an issue with NTP like this.
How are the downstream switches configured? Are they all pointing to the Linux server for NTP synch?

[posemman]

All downstream switches also point to 172.27.1.9 Linux server. Maybe the switch is old enough?