| 摘要 |
<p>A unicast-use tunnel (83) is added between the Note-C and GW-B (i.e., a unicast optimization). Then, the Note-C transmits, to a GM-C, a second IP packet encapsulating a first IP packet, to which an inter-GW header is added, by an IP header to which a multicast address is set. The multicast-use second IP packet is transferred to a CE (6001) by way of a tunnel (91) . The CE (6001) copies the received second IP packet and transfers it to a GW-A and the GW-B by way of the tunnel (91) (i.e., a multicast optimization).</p> |
