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.
domain-lookup name-server 8.8.8.8 8.8.4.4
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 ntp server north-america.pool.ntp.org, for example.
- North America, Eastern Time (UTC-5)
- Europe, Central European Time (UTC+1)
- Brazil, Brasília (UTC-3)
- Australia, Sydney (UTC+11)
North America (specifically Eastern Time, UTC-5):
configure terminal clock set 09:00:00 1 Jan 2018 clock timezone EST -5 0 ntp server north-america.pool.ntp.org exit
Europe (specifically Central European Time, UTC+1):
configure terminal clock set 09:00:00 1 Jan 2018 clock timezone CET +1 0 ntp server europe.pool.ntp.org exit
Brazil (specifically Brasília, UTC-3):
configure terminal clock set 09:00:00 1 Jan 2018 clock timezone BRT -3 0 ntp server br.pool.ntp.org exit
Australia (specifically Sydney, UTC+11):
configure terminal clock set 09:00:00 1 Jan 2018 clock timezone AEST +11 0 ntp server au.pool.ntp.org 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