When set to true(1), the switch will generate
a broadcastStorm notification upon detecting a port is
receiving broadcast packets at a rate higher than
or equal to the threshold specified by
c2900PortBroadcastRisingThreshold.
When set to false(2), no such trap will be issued.
Default value: false(2).
c2900PortBroadcastStormAlarm is defined for each port.