This attribute counts the number of SVC I-frames that are bound for
the link but have been discarded. Discard reasons may be one of the
following:
1. the frame length is beyond the allowed limit.
2. the SVC data link layer is in disconnected state.
3. the transmit queue has been purged because the queue length
has reached the reset threshold.
4. the transmit queue or the queue waiting for acknowledgment
has been purged because the link cannot be re-established.
When this count reaches maximum, it wraps to zero.