This read-only Counter64 counts queries discarded because the ingress port was down at the moment the query arrived. A nonzero count right after a known link flap is expected and benign, but a steady trickle on a port that monitoring shows as up points to a state-tracking mismatch worth investigating; because it is drawn from this instance's running statistics bin, it behaves like a long-running total rather than a rotating window, so admins baseline against it instead of expecting it to reset daily. On a subscriber-facing IPTV access port, a count of 2,579 over the current statistics window is the kind of number an admin would trend against the join/leave rate on the same port to judge whether it's normal channel-surfing or an anomaly worth a closer look.