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.
