H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 29/10 (2006.01) H04L 12/18 (2006.01) H04N 7/173 (2006.01)
Patent
CA 2286422
A multicast communication apparatus includes a center station and subscriber stations. Each station includes input/output ports, and a section for layer-2 bridging between the ports in a 7-layer OSI model. Each station includes a transfer control table for holding group addresses, and an address converting section. Each section also includes a section for transferring a multicast packet to corresponding ports, a section for analyzing the layer-3 message received from each port, a section for checking registration of layer-3 group addresses corresponding to subscription requests, transferring or not transferring the messages depending on whether the group addresses are registered, registering the corresponding group addresses, a section for transferring subscription state query messages and generating/outputting layer-3 multicast subscription request messages destined to acquired layer-3 group addresses, and a section for deleting a layer-3 group address from the table if the corresponding multicast subscription request message is not received for a predetermined period of time, and deleting a layer-2 group address if the corresponding layer-3 group address is not present. A multicast communication method is also disclosed.
Matsunaga Yasuhiko
Momona Morihisa
Corporation Nec
Smart & Biggar
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