This read-only Unsigned32 (1-100) is the percentage clear-alarm threshold for ND entries on a board; the alarm is cleared once the ratio of current ND entries to the maximum allowed drops to or below this value. Admins use it together with the exceed threshold to understand the hysteresis band that prevents alarms from flapping as the board's neighbor table usage fluctuates near the limit. For example, if this is set to 70, the board's earlier threshold-exceeded alarm clears once usage falls back to 70% or lower.