This identifies, by number, which specific trap type is subject to the throttling configuration defined by the related throttling-period and max-traps objects. Because different trap types have wildly different appropriate throttle rates, a 'config changed' trap firing rarely versus a 'port error' trap that could fire constantly during a bad cable event, this field lets an admin apply throttling selectively to just the noisy trap type rather than uniformly across all traps. For example, setting this to the trap number for a port-error alarm and pairing it with a low cdx6500SNMPMaxNumOfTraps prevents a flapping port from flooding the NMS with hundreds of identical traps per minute.