A table containing the set of ports to which
frames received from specific ports and containing the
specific packet string (destination address, source address,
type/length field as well as a window of 64 bytes of
packet data beginning at a data offset) of the corresponding
filter number of SdbEnetTable are allowed to be forwarded.
The value of '0' in this table as the RcvPort is used to
specify all ports which are not already specified in this
table for a particular entry.