| 摘要 |
In a network providing a wide-area LAN service which allows communications to be performed between user networks ( 12, 13 ) via a carrier network ( 11 ), edge switches ( 14, 15 ) each comprise: a tentative learning registration means ( 16 ) which, when a packet whose source MAC address and receiving port are not yet learned is received from the carrier network, registers the source MAC address and the receiving port in a tentatively learned state; a learned state changing means ( 17 ) which changes the learned state of the destination MAC address of a packet received from an associated one of the user networks to a permanently learned state; and a permanent learning registration means which, when a packet whose destination MAC address is registered in a learned state is received from the carrier network, registers the source MAC address and receiving port of the packet received from the carrier network in a permanently learned state. The invention thus provides a MAC address learning apparatus that improves the hit rate in a MAC address learning table maintained in each of the edge switches ( 14, 15 ) provided in a wide-area VLAN carrier network.
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