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Beginner

Cannot Sync Switch to NTP Server on Windows Server

Hi there,

 

            I setup NTP server on a domain controller. I had no problem to sync ntp server with most of 3850 switches (e.g. version 3.3.3se), but I have a 3850 with version 3.7.4E which cannot sync to ntp server. I tried to re-enable ntp server on the switch. I also tried to sync to external ntp server ip address directly, but no luck, same result. Can anyone tell me the reason why not syncing? 

 

           Here are results of sh ntp commands:

1. sh ntp status: Clock is unsynchronized, stratum 3, reference is 10.xxxxx
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**10
ntp uptime is 49900 (1/100 of seconds), resolution is 4000
reference time is E1703CA9.78D4FF40 (11:12:41.472 PST Fri Nov 8 2019)
clock offset is -20.7989 msec, root delay is 50.79 msec
root dispersion is 101.87 msec, peer dispersion is 17.51 msec
loopfilter state is 'FREQ' (Drift being measured), drift is 0.000000000 s/s
system poll interval is 64, last update was 24 sec ago.

 

2. sh ntp associations detail: 10.xxxxxx configured, ipv4, our_master, sane, valid, stratum 2
ref ID 216.239.35.12 , time E1703AE7.9F3E0370 (11:05:11.622 PST Fri Nov 8 2019)
our mode client, peer mode server, our poll intvl 64, peer poll intvl 64
root delay 46.79 msec, root disp 50.46, reach 377, sync dist 103.01
delay 5.00 msec, offset -19.4600 msec, dispersion 17.52, jitter 8.25 msec
precision 2**6, version 4
assoc id 3792, assoc name 10.xxxxxxx
assoc in packets 14, assoc out packets 14, assoc error packets 0
org time 00000000.00000000 (16:00:00.000 PST Wed Dec 31 1899)
rec time E1703CEE.7335D249 (11:13:50.450 PST Fri Nov 8 2019)
xmt time E1703CEE.7335D249 (11:13:50.450 PST Fri Nov 8 2019)
filtdelay = 5.00 4.00 6.00 5.00 6.00 5.00 4.00 6.00
filtoffset = -19.46 -20.79 -20.65 -17.42 -10.15 -8.15 -7.18 -9.23
filterror = 16.60 17.63 18.65 19.67 20.66 21.70 22.70 23.72
minpoll = 6, maxpoll = 10

1 ACCEPTED SOLUTION

Accepted Solutions
Beginner

Re: Cannot Sync Switch to NTP Server on Windows Server

Hi there,

 

           For anyone who has the same problem, NTP server sync would take 15-18mins for version 3.7.2e up in 3.7.xE, according to the release note. It took me 15 mins to sync. 

View solution in original post

2 REPLIES 2
VIP Mentor

Re: Cannot Sync Switch to NTP Server on Windows Server

Hello,

 

try and configure:

 

ntp passive

 

on the 3850s that don't sync...

Beginner

Re: Cannot Sync Switch to NTP Server on Windows Server

Hi there,

 

           For anyone who has the same problem, NTP server sync would take 15-18mins for version 3.7.2e up in 3.7.xE, according to the release note. It took me 15 mins to sync. 

View solution in original post

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