clock
Set the system clock. tldr-pages
On Cisco IOS
Cisco IOS
Set the current date and time
clock set 23:59:59 30 april 2000Auto negotiate with the far end of the link, defaulting to active-clock
clock active preferAuto negotiate with the far end of the link, defaulting to passive-clock
clock passive preferShow the current clock mode negotiated by the firmware
clock show interfaces