The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 2010
Filed:
Sep. 28, 2007
Youichi Konuma, Kawasaki, JP;
Koichi Saiki, Kawasaki, JP;
Junichi Shimada, Kawasaki, JP;
Akira Miyasaka, Kawasaki, JP;
Youichi Konuma, Kawasaki, JP;
Koichi Saiki, Kawasaki, JP;
Junichi Shimada, Kawasaki, JP;
Akira Miyasaka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A transmission device is connected to a layerswitch through a transmission path at one side, and to a relay transmission path at the other side. The transmission path includes a transmission path of a active system and a transmission path of a stand-by system. When failure occurs in the transmission path of the active system, the transmission device forcibly shuts down the transmission path of the active system upon detection of link down, to stop packet transmission, and causes the layerswitch to perform MAC address flush. The transmission device then switches the transmission path of the stand-by system to the active system, and transmits packets through the transmission path that has become the active system as a result of switching. The layerswitch performs MAC address learning to set a port, thereby maintaining communication even after occurrence of the failure.