The source Internet address of the IP multicast layer 3
flows. When the 'source' BIT of cswmFlowQueryMask
object in the same row is on,
an appropriate value should be specified and only flows
with the specified source address will be contained in the
result table. If the 'source' bit in the associated
cswmFlowQueryMask is off, this object is ignored
during the query.
The type of this address is determined by the value of the
cswmFlowQueryAddrType object.
The default value of this object is all zeros.