This counter counts CLP1-marked cells (the discard-eligible, lower-priority cells) that the NRTS processor received and dropped on this circuit. Because CLP1 is the ATM mechanism designed specifically to be sacrificed first under congestion, a rising cktNrtsDiscardClp1 value alongside a flat cktNrtsDiscardClp0 is actually the expected, healthy behavior of congestion control working as intended. An admin comparing this counter to cktNrtsDiscardClp0 for the same VC can quickly tell whether congestion management is discarding the right traffic (CLP1 climbing, CLP0 stable) versus a misconfiguration where CLP0 loss is also occurring.