Assume One Hardware Clock per NIC

Enhanced PTP User Guide (UG1602)

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1.1 English

Assume multiple PTP Hardware Clock (PHC) devices presented by the same PCI® device represent the same underlying clock, which is often the case for third party NICs. This is enabled by default. To disable:

assume_one_phc_per_nic off

See the assume_one_phc_per_nic option in Configuration Options.