3560G switch ntp not sync after ios upgrade

[lfgchinadc]

Hello,

     We have two 3560G-TS-E running 12.2(35)se2, configured as HSRP. Both are running ntp config "ntp peer 210.72.145.44" and it's pretty well that they get the correct time. Yesterday I upgraded the second device to IOS 12.2(58)se2 and ntp doesn't work now. I checked doc that 12.2(58)se2 runs ntp default version 4 so I change to "ntp peer 210.72.145.44 version 3" but still not work.

I put here "show ntp" result for different IOS.

Could someone help me? Thanks.

IOS 12.2(35)

SW01>show ntp status

Clock is synchronized, stratum 2, reference is 210.72.145.44

nominal freq is 119.2092 Hz, actual freq is 119.2022 Hz, precision is 2**18

reference time is D2EF12A5.2EB2DCB2 (15:07:17.182 GMT Wed Feb 22 2012)

clock offset is -4.6616 msec, root delay is 57.50 msec

root dispersion is 10.27 msec, peer dispersion is 5.60 msec

SW01>show ntp ass de

210.72.145.44 configured, our_master, sane, valid, stratum 1

ref ID .ACTS., time D2EF130A.00000000 (15:08:58.000 GMT Wed Feb 22 2012)

our mode active, peer mode server, our poll intvl 1024, peer poll intvl 1

root delay 0.00 msec, root disp 0.00, reach 375, sync dist 40.649

delay 66.02 msec, offset -14.0184 msec, dispersion 7.64

precision 2**16, version 3

org time D2EF130A.2624DD2F (15:08:58.148 GMT Wed Feb 22 2012)

rcv time D2EF130A.322F286E (15:08:58.196 GMT Wed Feb 22 2012)

xmt time D2EF130A.2147FE7B (15:08:58.130 GMT Wed Feb 22 2012)

filtdelay =    66.02   57.50   63.22   74.77   59.25   62.27   61.94   80.70

filtoffset =  -14.02   -4.66   -9.13  -12.38   -0.33   -2.07   -1.10  -28.27

filterror =     0.02    1.56    2.43    3.16    3.65    4.15    4.76    6.53

IOS 12.2(58)

SW02#show ntp status

Clock is unsynchronized, stratum 16, no reference clock

nominal freq is 119.2092 Hz, actual freq is 119.2092 Hz, precision is 2**17

reference time is 00000000.00000000 (08:00:00.000 GMT Mon Jan 1 1900)

clock offset is 0.0000 msec, root delay is 0.00 msec

root dispersion is 2.49 msec, peer dispersion is 0.00 msec

loopfilter state is 'FSET' (Drift set from file), drift is 0.000000000 s/s

system poll interval is 64, never updated.

SW02#show ntp asso de

210.72.145.44 configured, insane, invalid, unsynced, stratum 16

ref ID .INIT., time 00000000.00000000 (08:00:00.000 GMT Mon Jan 1 1900)

our mode active, peer mode unspec, our poll intvl 64, peer poll intvl 1024

root delay 0.00 msec, root disp 0.00, reach 0, sync dist 15940.55

delay 0.00 msec, offset 0.0000 msec, dispersion 15937.50

precision 2**17, version 3

org time 00000000.00000000 (08:00:00.000 GMT Mon Jan 1 1900)

rec time 00000000.00000000 (08:00:00.000 GMT Mon Jan 1 1900)

xmt time D2EF1417.A3473A87 (15:13:27.637 GMT Wed Feb 22 2012)

filtdelay =     0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00

filtoffset =    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00

filterror =  16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0

minpoll = 6, maxpoll = 10

[Alexander Maroukian]

Hi Jimmy,

Did you check if you can reach the server from the switch after the upgrade?

Best regards,

Alex

[lfgchinadc]

Hi Alexander,

     The time server doesn't allow ping but as I posted that I have another 3560G in the same vlan, working same ntp well.

[Leo Laohoo]

IOS version 12.2(58)SE (and later) and 15.0(1)SE (and later) takes exactly 10 minutes to synchronize (after a reboot or power up) to an NTP source.  Earlier IOS versions such as 12.2(55)SE take about 3 minutes.

Message was edited by: Leo Laohoo

[lfgchinadc]

Hello,

     Since this is a hot-standby device, I reloaded it. But many 10 minutes passed, the time is still not sync. The only difference is IOS upgrade. What else could be missing?

[Leo Laohoo]

Please post the output to the command "sh ntp a".

[lfgchinadc]

Hello,

     here is the output.

SW02>sh ntp a

  address         ref clock       st   when   poll reach  delay  offset   disp
~210.72.145.44   .INIT.          16      -   1024     0  0.000   0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured

[Leo Laohoo · Accepted solution]

Try looking at the NTP pool for China.  See if you can get to these:

http://support.ntp.org/bin/view/Servers/StratumTwoTimeServers

[lfgchinadc]

Hello Leo,

     I selected one ntp server from that link and now it works. Thanks.

[Leo Laohoo]

Thanks.  Still don't know why the official China NTP server is down.  I'd be expecting that they replace it with something else. 

[Leo Laohoo]

Jimmy,

You can configure multiple SNTP/NTP servers so if one fails the others can take over.

ntp server A.B.C.D prefer

ntp server 1.1.1.1

ntp server 2.3.5.6