MAC address learning apparatus

Details MAC address learning apparatus MAC address learning apparatus

2008-07-15

2008-07-15

Pezzlo, John (Department: 2619)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S255000, C370S397000, C709S249000

Reexamination Certificate

active

11038282

ABSTRACT:
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.

REFERENCES:
patent: 2003/0037163 (2003-02-01), Kitada et al.
patent: 2004/0223500 (2004-11-01), Sanderson et al.
patent: 2005/0180391 (2005-08-01), Shimada
patent: 3001735 (1991-01-01), None
patent: 4360336 (1992-12-01), None
patent: 6069927 (1994-03-01), None

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