A new option is added to the
ptp_utc_valid_handling parameter in
sfptpd configuration file.
The override option sets a fixed UTC offset (seconds) value and
sfptpd will ignore the UTC offset value sent by the upstream master clock. The option is provided as a means of protecting clocks against misbehaving PTP master clocks.
ptp_utc_valid_handling option in Instance-specific Configuration Options.