Home TCP/IP NTP How to setup NTP on Cisco router with summer-time zone

Accurate clock record is very information when you are troubling an issue. In these days, many NTP servers are availabe to use as free. However, you might want to pick good one which is lower stratum. Lower stratum number(1~3) is better. I will intend to make simple list of NTP servers based on each region. Currently, I am on east zone of USA and In this below example, I will use which is stratum 3.


Cisco_Router(config)#ntp server


Done, you might need to wait to synchronize your Cisco router to NTP server. It take few minutes. Be patient!

You can check with below command(below), it will give you NTP status

Cisco_Router#sh ntp status
Clock is synchronized, stratum 3, reference is
nominal freq is 250.0000 Hz, actual freq is 249.9981 Hz, precision is 2**18
reference time is CDB93371.D03D5B6B (08:43:29.813 EDT Sat May 16 2009)
clock offset is -4.7340 msec, root delay is 83.56 msec
root dispersion is 57.02 msec, peer dispersion is 15.29 msec

Let's add summer-time zone setup.

Cisco_Router(config)#clock timezone EST -5
Cisco_Router(config)#clock summer-time EDT date Apr 30 2008 0:00 Sep 30 2035 0:00


Now, check clock on your Cisco gear

Cisco_Router#sh clock
08:55:50.517 EDT Sat May 16 2009





Last Updated (Saturday, 16 May 2009 09:27)

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