Don't forget to configure timezone, sou all your devices switch to summer-time and back automatically without problems. Depending on your NTP server, it could be UTC, so you should set up offset.
clock timezone NAME OFFSET_FROM_UTC (1 for central European for example)
clock summer-time NAME recurring last Sun Mar 2:00 last Sun Oct 3:00 (times when to switch to summer time and back)
NTP server setup is easy:
"ntp server x.x.x.x" command is the most important command, and it tells device where to get the time from. Has to be reachable by IP. Could be a server in your network, that synchronizes to internet NTP. Or it could be a PC with NTP server functionality (see manuals for your operating systems). Or it can be another Cisco device.
You can secure your NTP a bit by using authentication. Update calendar, define update intervals and so on. Everything optional.
ntp authentication-key 1 some_password
ntp trusted-key 1
ntp clock-period 17179927
ntp server x.x.x.x key 1
ntp server y.y.y.y key 1
You can have as many servers as you want, but don't overdo it.
I have been using a Meinberg hardware device for my NTP needs and I like it alot.
It uses the GPS signal to get the time and if something happens to the GPS signal it has a internal clock that will hold time within specified parameters for atleast 10 days.
This solution is alot better than using any server desktop or network machine as a NTP server since the device has a better crystal than any "normal" server and it is constructed to do what it does and it does it good.
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