A reporting threshold for the total number of addresses
known for the bridge identified by this entry. When this
threshold is reached, the event
a3ComSysBridgeAddressThresholdEvent is generated. The range of
valid values for setting this object is between 1 and the
corresponding value reported by a3ComSysBridgeAddressTableSize
+ 1 (Note that this range applies to values issued in set
requests. The current value may be outside this range,
for example if the corresponding value of a3ComSysBridgeMode is
changed). Setting this object to one greater than the
address table size disables the generation of
a3ComSysBridgeAddressThresholdEvents since the limit will never
be reached.