This object indicates the number of inbound packets which were
chosen to be discarded even though no errors had been detected
to prevent their being deliverable to a higher-layer protocol.
One possible reason for discarding such a packet could be to
free up buffer space.
Discontinuities in the value of this counter can occur at
re-initialization of the management system, and at other
times as indicated by the value of
ifCounterDiscontinuityTime.