time drift on cisco routers and switches

[paulnigel]

Hi forum,

my cisco router and switches is having time drift issue, is there a way to solve this problem? can I sync it with the windows 2003 NTP server?

Kind regards,

paul

[gpulos]

YES,

you can sink your cisco router to a Win NTP server.

the command you'll use is as follows:

router(config)# ntp server x.x.x.x

(where x.x.x.x is the ip address of the NTP source; ie: your win2k3 server)

please see the following link for more NTP Server configuration info:

http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a8087.html#wp1118064

[foxbatreco]

Hii,

You can set the clock using the cli command, clock set hh:mm:ss followed by day,month and year.this will resolve the probs.

Pls rate if it helps.

[paulnigel]

Hi all,

Thanks much for your suggestions.

I am trying the NTP option but sync to an external time source, the NIST internet time service. but I have an ASA firewall blocking the NTP traffic. I do this:

access-list ACL_IN extended permit udp host 129.6.15.28 eq ntp 172.16.0.0 255.25

5.0.0 (for inside interface)

access-list ACL_OUT extended permit udp 172.16.0.0 255.255.0.0 host 129.6.15.28 eq ntp (for outside interface)

but i cannot seems to make it work. how do I do this?

Thanks much,

paul