This object indicates the number of output
packets dropped by the interface even though
no error had been detected to prevent them
being transmitted.
The packet could be dropped for many reasons,
which could range from the interface being
down to errors in the format of the packet.
Discontinuities in the value of this variable
can occur at re-initialization of the
management system, and at other times as
indicated by the values of
cieIfPacketDiscontinuityTime.