cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
18467
Views
17
Helpful
16
Replies

NTP update on the 3850

rasmus.elmholt
Level 7
Level 7

Hi

I have a 3850 switch with NTP configured. The connection to the NTP server was disconnected briefly but after the reconnect NTP hasn't syncroniced.

It would probably start to work if i remove and add the ntp server statement againt. But are there any ways to get this to work again without reconfiguring the switch(removing and adding the ntp server)

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 32 WS-C3850-24T 03.06.03.E cat3k_caa-universalk9 BUNDLE

SWITCH#show clock
.09:22:29.466 Greenl Thu Sep 15 2016
SWITCH#show ntp ass

address ref clock st when poll reach delay offset disp
~172.20.5.49 .INIT. 16 127137 1024 0 0.000 0.000 15937.
172.28.10.44 .INIT. 16 1323 1024 0 0.000 0.000 16000.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
SWITCH#show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0050 Hz, precision is 2**10
ntp uptime is 2378908500 (1/100 of seconds), resolution is 4000
reference time is DB831257.C624DF50 (22:03:35.774 Greenl Tue Sep 13 2016)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 1.81 msec, peer dispersion is 0.00 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000020078 s/s
system poll interval is 64, last update was 127142 sec ago.
SWITCH#

16 Replies 16

Is it a Cisco Router

If the two hosts are Cisco routers are the routers synchronized to the correct time & date?

Can the 3850 stack ping the two hosts' IP address?

andres.serranoq
Level 1
Level 1

conf t

ntp peer vrf VRF_NAME X.X.X.X prefer

ntp source GigabitEthernet0/0