Methods, systems, and networks for tracking multicast cell copies in a switch. The switch includes a plurality of output ports each having an associated output port register, and a port memory controller for receiving a bit map on the enqueue of a cell into the switch. The bit map includes a bit for...http://www.google.se/patents/US6310875?utm_source=gb-gplus-sharePatent US6310875 - Method and apparatus for port memory multicast common memory switches
