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SG350-28P / NTP config

Dear all,

kindly allow support for a switch newbie like me:

 

A. HARDWARE

. German type router [Fritzbox 7590 with OS 7.25] and NTP server functionality enabled.

. Switch SG350-28P 28-Port Gigabit PoE Managed Switch and firmware 2.5.7.85 updated

. both in same LAN

 

 

B. CONFIGURATION

. I have the router set to obtain time stamp from a European NTP pool and this appears to work fine

. I now want to set my LAN to obtain this router time by NTP. Works fine e. g. for my server. Time deviation there between source (router) and client (server) is at most 10-20 milliseconds

. See screenshots for switch config

 

 

C. QUESTION

. Interestingly, the switch does pick up time from router but deviation is typically 1000-1500 milliseconds
(> 1 s). This delta does not appear to converge within a week of operation

Kindly support with your experience and give me a hint on what might be wrong or where I set the wrong buttons. Since I am new to Cisco hardware, please guide me trough as simple as possible (preferably via GUI and not console)

 

Thank you very much for any reply and support!

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