Configure NTP

In this post I will go through the steps to configure my router to use a NTP server as a time source.

First I will check the current configuration. I will then ping the public NTP server before setting up the router to use it.


router1#sh clock detail
23:18:28.123 GMT Sun Mar 21 2010
Time source is user configuration

router1#ping 130.88.203.12
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 130.88.203.12, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/24/24 ms

router1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
router1(config)#ntp server 130.88.203.12


Useful show commands to check the NTP settings are:

show ntp status
show ntp associations