This read-only counter tracks input CLNP PDUs that encountered no specific processing problem but were discarded anyway, for example due to a lack of available buffer space, and specifically excludes any PDUs discarded while awaiting reassembly. An admin seeing this counter rise, especially under heavy load, would suspect the entity is running low on buffer resources rather than encountering malformed or misrouted traffic. For example, a spike in this counter during a traffic surge, with header and address error counters staying flat, would point the admin toward resource exhaustion as the cause of dropped packets rather than bad input.