NTP setup

Question

Hi,
my customer has following NTP setup:
On C6500:
ntp clock-period 17180036
ntp source Vlan1
ntp master 2
ntp update-calendar
ntp peer 195.146.147.3 prefer
on ASA:
ntp server 217.118.109.178 source Outside prefer
I made same show commands to view current status:
C6500:
Central-C6506-E#show ntp status
Clock is synchronized, stratum 2, reference is 127.127.7.1
nominal freq is 250.0000 Hz, actual freq is 249.9975 Hz, precision is 2**18
reference time is CDECBB11.66582776 (16:47:45.399 GMT Wed Jun 24 2009)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.02 msec, peer dispersion is 0.02 msec
Central-C6506-E#show ntp associations
address ref clock st when poll reach delay offset disp
*~127.127.7.1 .LOCL. 1 55 64 377 0.0 0.00 0.0
~195.146.147.3 0.0.0.0 16 - 1024 0 0.0 0.00 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
Central-C6506-E#show clock detail
16:48:46.860 GMT Wed Jun 24 2009
Time source is NTP
Summer time starts 02:00:00 GMT Sun Mar 29 2009
Summer time ends 03:00:00 GMT Sun Oct 25 2009
on ASA:
ASA# show ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 99.9984 Hz, actual freq is 100.0188 Hz, precision is 2**6
reference time is cd7dafda.e4f5dbf6 (11:18:18.894 CEDT Wed Apr 1 2009)
clock offset is -2.3843 msec, root delay is 0.50 msec
root dispersion is 52.11 msec, peer dispersion is 22.64 msec
ASA# show ntp associations
address ref clock st when poll reach delay offset disp
~217.118.109.178 194.160.23.2 2 84d 64 0 -0.0 -2.38 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
ASA# show clock detail
16:46:11.870 CEDT Wed Jun 24 2009
Time source is NTP
Summer time starts 02:00:00 CEST Sun Mar 29 2009
Summer time ends 03:00:00 CEDT Sun Oct 25 2009
Then i made clock comparison:
Real time was: 16:37:30
On C6500:
Central-C6506-E#show clock
16:41:46.716 GMT Wed Jun 24 2009
On ASA:
ASA# show clock
16:38:36.094 CEDT Wed Jun 24 2009
So the time on ASA is shifted front to one minute and on C6500 four minutes.
My questions:
Whats are reasons that the time is shifted?
How to setup time/change actual setting that the time will be right on this machines?
Many thanks.

Answer 1

Because it is a customer system and i can't to change actual philosophy.
I want to synchronize it with external server but if i am right c6500 is always synchronized with himself at first.
C6506-E#show ntp associations
address ref clock st when poll reach delay offset disp
*~127.127.7.1 .LOCL. 1 55 64 377 0.0 0.00 0.0
~195.146.147.3 0.0.0.0 16 - 1024 0 0.0 0.00 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~ configured
So how to setup c6500 that will be synchronized from external internet server and at the same time provide clock synchronization for all other devices on network?
Thanks.