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How do I configure NTP on My Cisco Router?  How do I find a reliable NTP Server?

Posted on 2009-03-30
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Last Modified: 2012-05-06
Currently I have no NTP server specified on my Cisco Router.  I have the timezone and daylight savings time configured but no NTP server.  Should I have an NTP server?  If so, how do I go about choosing one?  Would I configure this on all my cisco devices or just my router connecting to my ISP?  Thanks
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Question by:Crossroads305
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by:JFrederick29
ID: 24020001
Yes, you should use NTP as it makes log timestamps usable.

Here are two I commonly use:

Washington, DC: U.S. Naval Observatory
192.5.41.41: tock.usno.navy.mil
192.5.41.40: tick.usno.navy.mil

You typically want to choose a time server that is close geographically and is reliable.

Set the router to use stratum 1 Internet time servers (like above) and then you can point your other devices to the router for their time.
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by:Crossroads305
ID: 24020042
Thanks.  So once I configure NTP on my Router, I just point my other devices (ASA's, VPN Concentrators, Switches, etc) to that router that I configured NTP on?  Will not using NTP slow down a network?
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JFrederick29 earned 500 total points
ID: 24020067
Yes, correct, you can point your other devices to the router.

NTP will not speed up or slow down the network.  It is simply to keep the time on the device as accurate as possible.
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