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Command line - Cisco router example

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Log into the device with Telnet or SSH. Enter privileged mode by typing enable and entering your enable password.

Enable DNS lookup

Make sure DNS lookups are enabled on your device so it can be synced to an NTP server. Run the following command. Replace 8.8.8.8 8.8.4.4 with the DNS servers you’d like to use.

enable
ip domain lookup
ip name-server 8.8.8.8 8.8.4.4
exit

Set the clock, time zone, and NTP server

There are four locations shown as examples. To see the available global zones from NTP Pool, refer to https://www.ntppool.org/zone/@.

For each example, replace clock set 09:00:00 1 Jan 2018 with the current time and date at the time the setting was applied. If you use a zone not shown below, also update clock timezone EST -5 0 and clock summer-time, for example.

North America (specifically Eastern Time, UTC-5):

enable
configure terminal
clock set 09:00:00 1 Jan 2018
clock timezone EST -5 0
clock summer-time EDT recurring 2 Sun Mar 02:00 1 Sun Nov 02:00
ntp server pool.ntp.org prefer
ntp update-calendar
exit 

Europe (specifically Central European Time, UTC+1):

enable
configure terminal
clock set 09:00:00 1 Jan 2018
clock timezone CET +1 0
clock summer-time CEST recurring last Sun Mar 02:00 last Sun Oct 03:00
ntp server pool.ntp.org prefer
ntp update-calendar
exit

Brazil (specifically Brasília, UTC-3):

enable
configure terminal
clock set 09:00:00 1 Jan 2018
clock timezone BRT -3 0
clock summer-time BRST recurring 3 Sunday October 00:00 3 Sunday February 00:00
ntp server pool.ntp.org prefer
ntp update-calendar
exit

Australia (specifically Sydney, UTC+11):

enable
configure terminal
clock set 09:00:00 1 Jan 2018
lock timezone AEST +11 0
clock summer-time AEDT recurring 1 Sunday October 02:00 1 Sunday April 03:00
ntp server pool.ntp.org prefer
ntp update-calendar
exit

Confirm the NTP settings

To make sure the settings took effect, run the following command: show clock detail

Synchronize with an NTP server

To make sure the unit has synchronized with an NTP server, run the following command: show ntp status

Exit configuration mode and save changes

If you see Clock is synchronized, you're good to go. Lock in your changes so they'll survive a reboot of the router.

# Save active configuration
end write memory # Save the current running configuration to the startup configuration file copy running-config startup-config

 

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