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sg300 sntp doesn't sync periodically.

sg300 sntp doesn't sync periodically.

It has synced once and it doesn't update it anymore, unless I re-config the sntp on the sg300.

Anyone has got the sntp properly setup ?

 

A simple topology:

ISP --- [puplic ip] c800 router [172.31.1.1] --- [172.31.1.2] sg300 switch

 

c800 router:

clock timezone CEST 1
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
ntp server 194.109.6.2

 

c800r# sh ntp associations
address ref clock st when poll reach delay offset disp
*~194.109.6.2 193.67.79.202 2 68 1024 377 28.483 0.138 18.680
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured

c800r#sh ntp status
Clock is synchronized, stratum 3, reference is 194.109.6.2
nominal freq is 249.9433 Hz, actual freq is 249.9417 Hz, precision is 2**16
reference time is E108CE93.F0C032FB (10:19:31.940 CET Thu Aug 22 2019)
clock offset is 0.0001 msec, root delay is 0.03 msec
root dispersion is 0.03 msec, peer dispersion is 0.01 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000006480 s/s
system poll interval is 1024, last update was 110 sec ago.

sg300 switch:

clock timezone CEST +1
clock summer-time CET recurring eu
clock source sntp
sntp unicast client enable
sntp server 172.31.1.1 poll

sg300#sh sntp status

Clock is synchronized, stratum 3, reference is 172.31.1.1, unicast

Unicast servers:

Server : 172.31.1.1
Source : Static
Stratum : 3
Status : up
Last Response : 12:07:19.0 CET Aug 15 2019
Offset : -3172.4163138 mSec
Delay : -1000 mSec

Anycast server:
Broadcast:

sg300#sh sntp configuration
SNTP destination port : 123 .
Polling interval: 1024 seconds.
No MD5 authentication keys.
Authentication is not required for synchronization.
No trusted keys.

Unicast Clients: Enabled
Unicast Clients Polling: Disabled

Server : 172.31.1.1
Polling : Enabled
Encryption Key : Disabled

Broadcast Clients: disabled
Anycast Clients: disabled
No Broadcast Interfaces.
Source IPv4 interface:
Source IPv6 interface: