This attribute counts the number of valid frames with the Discard
Eligibility (DE) bit set to 1 received from the link since the start of
the interval. Subtract this attribute and discardedFrames from
totalIngressFrames to calculate total valid frames received from the
link, with the DE bit set to 0. The start of the interval is captured in
the startTime attribute. The count is reset to zero when an
accounting record is generated or at call setup. If the
accountingEnabled attribute is no, then this attribute is not
displayed.