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To enable NTP and related clocking services, follow these steps.
From the Cisco IOS device, enter the following commands. Enable debug timestamps and include the
date, time, and milliseconds relative to the local time zone:
!
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
!
Identify the local timezone and enable recurring time adjustments for daylight savings time by entering
the following commands:
!
clock timezone CST -6
clock summer-time CST recurring
!
Locate an NTP server that can be reached by the Cisco IOS device.
Specify the IP address for the NTP server and enable automatic-calendar updates by entering the
following commands:
!
ntp update-calendar
ntp server 172.22.255.1
!
By default, the ntp clock-period command is enabled in some Cisco IOS releases.
The Cisco IOS software appends an arbitrary number to the end of the command.
Verify that the clock is synchronized with the NTP server by entering the following command:
travis-nas-01>show ntp status
Clock is synchronized, stratum 9, reference is 172.22.255.1
nominal freq is 250.0000 Hz, actual freq is 249.9987 Hz, precision is 2**24
reference time is BD123336.28CCF0C4 (18:09:42.159 CST Sat Jul 8 2000)
clock offset is 0.1183 msec, root delay is 61.84 msec
root dispersion is 0.93 msec, peer dispersion is 0.79 msec
travis-nas-01>
Inspect the status and time association. Clock sources are identified by their stratum levels. The
previous display shows a stratum level nine clock.
If the NTP synchronization does not take place, reload the router.
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