This Counter64 counts ATM cells marked CLP1 (lower priority, discard-eligible) that were discarded at ingress for exceeding this circuit's traffic contract, representing the expected first line of loss under ATM congestion. A rising count here without a corresponding rise in circuitInCLP0CellsDiscard is the normal, by-design outcome of traffic shaping -- lower-priority cells being sacrificed to protect higher-priority CLP0 traffic. For example, an admin seeing steady growth here but a flat CLP0 discard counter would conclude the circuit is under some load pressure but the priority-based protection scheme is working correctly.