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Task 4Using Syslog, NTP, and Modem Call Records to Isolate and Troubleshoot Faults
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Basic Dial NMS Implementation Guide
Enabling NTP on a Cisco IOS Device
To enable NTP and related clocking services, follow these steps.
Step 1
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
!
Step 2
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
!
Step 3
Locate an NTP server that can be reached by the Cisco IOS device.
Step 4
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
!
Note
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.
Step 5
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.
Note
If the NTP synchronization does not take place, reload the router.