This is a general question to the handling of ptp4l and phc2sys (-a -r) running
on PTP nodes:
Assuming PTP aware nodes (i.e. a 1588 capable switch acting as a BC, or an end
application acting as a PTP slave) are running ptp4l and probably phc2sys (-a
-r) for CLOCK_REALTIME synchronization.
These nodes assume a monotonously increasing PTP time. If (i.e. due to
re-arrangements within the time master) the PTP time becomes non-monotonous (in
worst case: jumping backwards in time), subsequent downstream nodes get
confused. According to our observation, ptp4l and phc2sys on the downstream
nodes require a restart for proper operation. How is this signaling handled in
practice?
Best regards,
Albrecht Rommel
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