NTP Configure in Router 2800

Unanswered Question
Apr 21st, 2010

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I have a problem in NTP server below our current senior

We have configure Router 2800 as a NTP server to provide time for CUCM

When we configure before it was working fine but suddenly we found there is some time deference on all telephones connected to CUCM

Configuration for Router (note we have configured firewall to allow our router for communicate with NTP)but still our router not able to communicate with outside NTP

ntp source FastEthernet0/0

ntp master

ntp server 122.226.192.4

ntp server 120.88.47.10

ntp server 207.46.197.32

ntp server 203.158.118.2

ntp server 221.139.48.11

router# sh ntp sta

Clock is synchronized, stratum 8, reference is 127.127.7.1

nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18

reference time is CF7A6BE9.95FDA0A4 (09:32:09.585 +3GMT Thu Apr 22 2010)

clock offset is 0.0000 msec, root delay is 0.00 msec

root dispersion is 0.02 msec, peer dispersion is 0.02 msec

router#sh ntp associations

      address         ref clock     st  when  poll reach  delay  offset    disp

~122.226.192.4    0.0.0.0          16     -   256    0     0.0    0.00  16000.

~120.88.47.10     0.0.0.0          16     -   256    0     0.0    0.00  16000.

~207.46.197.32    0.0.0.0          16     -   256    0     0.0    0.00  16000.

*~127.127.7.1      127.127.7.1       7     6    64  377     0.0    0.00     0.0

~203.158.118.2    0.0.0.0          16     -   256    0     0.0    0.00  16000.

~221.139.48.11    0.0.0.0          16     -   256    0     0.0    0.00  16000.

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

From CUCM our router is accessible

I have this problem too.
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ycae Thu, 04/22/2010 - 02:40

Hi,

Are you sure that you are able to reach these ntp servers that you have listed? I am wondering since you don't even have the reference clock which seems to me that your router is actually not able to connect the ntp servers that you have listed. (udp/123)

Yves

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