| 摘要 |
<P>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. <P>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. <P>COPYRIGHT: (C)2013,JPO&INPIT |
