This read-create integer, 0-65535 and defaulting to 0, identifies which entry in the RMON event table is triggered when this alarm's rising threshold is crossed; a value of 0 means no event is generated since zero is not a valid event index, and it cannot be modified once the entry's status is valid. Admins set it to link a rising-threshold crossing to a specific logged or trap-generating event action. For example, an admin wanting an SNMP trap sent whenever CPU utilization spikes above the rising threshold would point h3cRmonExtAlarmRisingEvtIndex at an event entry configured to send that trap.