This read-only counter, in cells, tracks the number of valid CLP=1, discard-eligible, cells in the ingress direction of this channel that were discarded because the class-of-service queue overflowed. An admin expects this counter to rise during periods of congestion, since CLP=1 cells are specifically the ones designed to be sacrificed first to protect higher-priority traffic when a CoS queue fills up. For example, seeing this counter climb while cwacsIngCLP0CoSDiscard stays at zero is the expected, healthy pattern during congestion, confirming the priority scheme is protecting high-priority traffic as designed.