This read-only counter tracks the number of ATM CLP0 cells received and discarded on this leaf's VCC. Since CLP0 cells are meant to be protected from discard, any nonzero count here on a specific leaf is a direct sign that this individual leaf's connection is experiencing resource exhaustion (buffer, bandwidth) severe enough to be dropping even its protected traffic, distinct from the aggregate circuit-level discard counters. An engineer noticing one specific leaf in a multipoint tree showing rising cktLeafAtmInDiscardedClp0Cells while sibling leaves show none would suspect a problem isolated to that leaf's particular path or port rather than a tree-wide issue.