NTP Monitor Mode

Only one time protocol service can control the system clock at a time. Therefore, you can configure only a single instance of the NTP service (svc:/network/ntp:default) or the PTP service (svc:/network/ptp:default) on a system.

Starting with Oracle Solaris 11.4 SRU 45, the NTP service introduces a second instance called svc:/network/ntp:monitor. This instance enables NTP to monitor the system clock but not adjust it. When enabled, the ntp:monitor service instance relies on PTP to control the system clock. See Monitor Mode in the ntpd(8) man page.