ntp master [stratum]
Make this device an authoritative NTP time source on its own clock, at stratum 1-15 (8 when omitted).
Example
R2(config)# ntp master 3It makes the device an NTP source at that stratum, default 8: 'show ntp status' on it reads its own stratum with reference 127.127.1.1, and a client with 'ntp server <its ip>' synchronizes one level below it (stratum 4 under a stratum-3 master). A stratum outside 1-15 is rejected.
Don't just read it — type ntp master [stratum] in a real network simulator in your browser and watch it take effect. No install, no account needed to start.
Frequently asked
What does the "ntp master [stratum]" command do?
Make this device an authoritative NTP time source on its own clock, at stratum 1-15 (8 when omitted).
What's the common gotcha with "ntp master [stratum]"?
It makes the device an NTP source at that stratum, default 8: 'show ntp status' on it reads its own stratum with reference 127.127.1.1, and a client with 'ntp server <its ip>' synchronizes one level below it (stratum 4 under a stratum-3 master). A stratum outside 1-15 is rejected.
Example of "ntp master [stratum]"
R2(config)# ntp master 3