This file shows how to configure sfptpd
to act as a PTP master, using the NTP daemon as the reference:
- An NTP sync module is instantiated using the
sync_module
option:- The key-id and key-value are set for authenticating with NTP
using the
ntp_key
option.
- The key-id and key-value are set for authenticating with NTP
using the
- A PTP sync module is instantiated using the
sync_module
option. - The PTP sync module is configured to act as a PTP master by using the
ptp_mode
option. - The master also has
ptp_tx_latency
andptp_rx_latency
options that can be used to compensate for latency between the NTP daemon and interface (see PPS Measurements). - Any PTP traffic is transmitted using hybrid mode by using the
ptp_network_mode
option in the generic[ptp]
section (see Hybrid Mode).
Note: NTP uses UTC time - not atomic (TAI) time. When
sfptpd
is configured as a master clock, it uses UTC time. Therefore ensure that the ptp_utc_offset parameter in the sfptpd
master config file is set to a value of 0.