Abstract: A switching system includes a plural of line and a switch card. The line card or cards notifies the out whether or not the line card or line cards is in the FDB learning enabled state. The switch card includes a learning information storage unit that holds in store the FDB learning information received from the multiple line cards and an FDB learning arbitration unit that, when all of the line cards are in an FDB leaning enabled state, selects and sends the FDB learning information, stored in the learning information storage unit, to the respective line cards, based on a notification from each the line cards.

Abstract: A switching system includes a plurality of line cards and a switch card. The line card or cards notifies the switch card about whether or not the line card or cards is in the FDB learning enabled state. The switch card includes a learning information storage unit that holds in store the FDB learning information received from the multiple line cards and an FDB learning arbitration unit that, when all of the line cards are in an FDB learning enabled state, selects and sends the FDB learning information, stored in the learning information storage unit, to the respective line cards, based on a notification from each of the line cards.

Abstract: A relay apparatus includes a MAC (Media Access Control) address learning table for recording transfer destinations for frames. The relay apparatus is connected to other relay apparatuses to compose a network of a ring redundancy method. The relay apparatus includes a port move detecting circuit for detecting a port move which occurs in a case where a frame arrives from other than a path learned in the MAC address learning table on a path changing on ring redundancy.