The value of tmnxIPMafMatchL4SrcPortMask specifies a mask to be used
when the value of tmnxIPMafMatchL4SrcPort is not equal to zero.
The mask allows a range of TCP or UDP port values to be
specified for the match criteria in this Management Access Filter
Entry. A value of 65535, 0xFFFF, is used to indicate that
this object is not initialized.