You have a couple options available to you. If you go into signature configuration, you can configure how the signature is reported - by altering the alarmthrottle. The alarmthrottle limits the number of alarms sent to the IDS management device.
You have available under AlarmThrottle:
FireAll - Send all alarms when the signature conditions are met.
FireOnce - Send the first alarm when the conditions are met. Then, do not send any more alarms from the same SOURCE and DESTINATION address COMBINATION.
Summarize - Send only one alarm per "throttleinterval" per address combination"
GlobalSummarize - Similar to summarize parameter but expands to all address combinations instead of one. For example, once an alarm is sent the sensor counts the subsequent alarms per the throttleinterval for all address combinations being monitored. This will reduce the number of alarms triggered during flood attacks.
hope this helps