This value identifies which kind of traffic, broadcast, multicast, or unicast, triggered a storm-constrain trap on a port. An admin reads it in a received trap to know at a glance whether it was a broadcast flood, a multicast flood, or a unicast flood that pushed the port over or back under its configured threshold. For example, a trap carrying hh3cStormTrapType=broadcast(1) means broadcast traffic on the port crossed its configured upper or lower limit.