This Counter32 object counts good packets received by a port that were dropped due to lack of resources, such as insufficient input buffers, or were dropped before the packet's validity could even be determined due to a receive FIFO overflow, excluding drops already counted elsewhere. An admin diagnosing a port that's losing traffic under load watches this counter for growth to confirm the switch itself is the bottleneck rather than the upstream device. For example, a rapidly climbing value here on a heavily loaded uplink port would point the admin toward increasing buffer allocation or investigating a hardware resource constraint on that port.