This read-write integer sets the higher of two queue-depth thresholds at which cells marked with Cell Loss Priority (CLP) set - meaning they're eligible for discard under congestion - begin to be dropped in the ingress direction, and it must be configured at or below ingrQDepth. Admins use this to implement selective discard: as the queue fills toward capacity, CLP-tagged (lower-priority) cells are dropped before higher-priority CLP=0 cells to protect more important traffic. For example, setting ingrQCLPThreshHigh below ingrQDepth ensures the queue starts shedding tagged cells before it's completely full and would otherwise have to drop everything indiscriminately.