Statistics

Statistics are reported differently for each of the three interfaces.

Parent physical interface: No logical interfaces can be configured on the parent interface when it is in unidirectional mode. Therefore all traffic statistics for this interface are reported as zero. All port-level statistics are reported on the parent physical interface rather than the rx or tx physical interfaces.
Transmit-only physical interface: All transmit traffic statistics are reported for this interface. All receive (input) statistics are reported as zero. Also shown here are statistics for any logical interfaces configured on the transmit-only interface.
Receive-only physical interface: All receive traffic statistics are reported for this interface. All transmit (output) statistics are reported as zero. Also shown here are statistics for any logical interfaces configured on the receive-only interface.