FRAME RELAY DEVICE, NETWORK SYSTEM AND FRAME RELAY METHOD

PROBLEM TO BE SOLVED: To provide a frame relay device in which circulation of a frame is prevented even when abnormalities occur in the operation of a redundant protocol, and to provide a network system and a frame relay method.SOLUTION: A relay unit of a frame relay device permits forwarding of a f...

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Bibliographische Detailangaben
Hauptverfasser:	SETO KOICHIRO, AOSHIMA KENJI
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a frame relay device in which circulation of a frame is prevented even when abnormalities occur in the operation of a redundant protocol, and to provide a network system and a frame relay method.SOLUTION: A relay unit of a frame relay device permits forwarding of a frame when the source MAC address contained in the frame is registered in a forwarding database, and the number of a port registered in the forwarding database in association with the source MAC address matches the number of a port which received the frame, but does not register the number of a port which received the frame in the forwarding database when the source MAC address is registered in the forwarding database, and the number of a port registered in the forwarding database in association with the source MAC address is different from the number of a port which received the frame, and prohibits forwarding of a frame.