Cisco IOS

router# config t
Enter configuration commands, one per line. End with CNTL/Z.
router(config)# no ntp server
router(config)# ntp server ntp1.ntp.org.ua
router(config)# ntp server ntp2.ntp.org.ua
router(config)# ntp server ntp3.ntp.org.ua
router(config)# ntp server time.ntp.org.ua
router(config)# copy running-config startup-config

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