This read-only counter tracks the number of bytes discarded in the egress direction specifically because of buffer overflow, directly reflecting the data-loss impact of the events counted by cesBufOverflows, and it too is not supported on CESM-8P. An administrator uses this counter, where supported, to quantify actual data loss from overflow events rather than just counting overflow occurrences. A growing cesOflowDropBytes count alongside cesBufOverflows confirms overflow events are causing measurable data loss rather than being absorbed without consequence.