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DWA
New Member

NTP Problem.

Hello,

A customer has got a 7513 and a 4006L3 (4232 card).

He wants synchronize the 4006L3 to 7513.

He inserts the follow command on the 4006 : ntp server ip@7513.

During 15 minutes exactly, the 4006 is very synchronized.

#sh ntp asso

address ref clock st when poll reach delay offset disp

*~IP_7513 REF_CLOCK 2 21 64 377 -0.1 184.96 38.0

#sh ntp stat

Clock is synchronized, stratum 3, reference is IP_7513

nominal freq is 250.0000 Hz, actual freq is 249.9994 Hz, precision is 2**24

reference time is C173AC20.AA5D36B2 (15:56:32.665 gmt+1 Wed Nov 6 2002)

clock offset is 184.9635 msec, root delay is 14.74 msec

root dispersion is 227.97 msec, peer dispersion is 38.01 msec

At the 15minutes 01 secondes exactly and after, the 4006 is desynchronized !!!

#sh ntp associations

address ref clock st when poll reach delay offset disp

~ IP_7513 REF_CLOCK 2 48 64 0 18.2 857.79 16000.

* master (synced), # master (unsynced), + selected, - candidate, ~ configured

#sh ntp stat

Clock is unsynchronized, stratum 16, no reference clock

nominal freq is 250.0000 Hz, actual freq is 249.9994 Hz, precision is 2**24

reference time is C173B848.F1DC48AE (16:48:24.944 gmt+1 Wed Nov 6 2002)

clock offset is 857.7924 msec, root delay is 31.59 msec

root dispersion is 16739.00 msec, peer dispersion is 16000.00 msec

Thank you for your help.

2 REPLIES
New Member

Re: NTP Problem.

1. Which ntp server is uses the 7513 and how are those stats?

2. Have you tried to configure a different ntp server than the 7513? You could use some public ntp servers:

http://www.eecis.udel.edu/~mills/ntp/servers.html

3. You could use more the 1 as ntp servers and put a "prefer" behind your favorite one.

Hope this helps If not post your ntp configuration.

Andreas

DWA
New Member

Re: NTP Problem.

Hello Andreas and thank You for your help.

1) The ntp on a 7513 used a firewall ntp and it's working good.

Those stats show that it"s synchronised.

2-3) I tried to configure the ntp on 7513 and it's ok.

The probleme is located on 4232-card from the 4006.

We different ntp servers on 4232-card from the 4006, it's failed after 15minutes.

But I have reproduce this bug in our labs with the same IOS version

for the 4232-card from 4006 ( version : cat4232-in-mz.120-7.W5.15d.bin ).

I am surprised that i haven't found informations on the TAC cisco.

I have tried with another recent IOS (cat4232-in-mz.120-18.W5.22b.bin or cat4232-in-mz.120-10.W5.18f.bin) and we don't have desynchronisations.

I think we will update the version of the 4232.

Thank You.

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