Lab Objective:
The objective of this lab exercise is for you to learn and understand how to configure the Cisco router to access the time from an NTP server.
Lab Purpose:
NTP is an important tool used by Cisco equipment to ensure that devices share a consistent time. It is also used to add accurate timestamps to debug messages.
Certification Level:
This lab is suitable for CCENT and CCNA certification exam preparation.
Lab Difficulty:
This lab has a difficulty rating of 5/10.
Readiness Assessment:
When you are ready for your certification exam, you should complete this lab in no more than 5 minutes.
IMPORTANT NOTE: In order to test NTP, you will need to be connected to an actual NTP server that you probably will not have with a home lab or remote rack.
Lab Topology:
Please use the following topology to complete this lab exercise:
Task 1:
Configure the hostname on router R1 as illustrated in the topology.
Task 2:
Set the clock manually to any time zone and time of your choice.
Task 3:
Configure R1 to access two NTP servers. Use any IP addresses you wish.
Task 4:
Verify your NTP configurations with the appropriate show commands.
Configuration and Verification
Task 1:
For reference information on configuring hostnames, please refer to earlier labs.
Task 2:
R1#clock set 15:10:30 15 June 2014 R1# *Jun 15 15:10:30.000: %SYS-6-CLOCKUPDATE: System clock has been updated from 00:02:21 UTC Fri Mar 1 2002 to 15:10:30 UTC Sun Jun 15 2014, configured from console by console. R1#show clock 15:10:35.375 UTC Sun Jun 15 2014
Task 3:
Some of these commands won’t work with Packet Tracer.
R1(config)#ntp server 10.1.1.1 prefer R1(config)#ntp server 172.16.1.1 R1(config)# R1(config)#end
Task 4:
R1#show ntp associations address ref clock st when poll reach delay offset disp ~10.1.1.1 0.0.0.0 16 - 64 0 0.0 0.00 16000. ~172.16.1.1 0.0.0.0 16 - 64 0 0.0 0.00 16000. * master (synced), # master (unsynced), + selected, - candidate, ~ configured R1#show ntp status Clock is unsynchronized, stratum 16, no reference clock nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18 reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900) clock offset is 0.0000 msec, root delay is 0.00 msec root dispersion is 0.00 msec, peer dispersion is 0.00 msec R1#
You can add another router and configure it as an NTP server with the command below:
R1(config)#ntp master ? <1-15> Stratum number <cr>