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:
Jan. 10, 2012
Filed:
Feb. 16, 2007
Masaki Umayabashi, Tokyo, JP;
Nobuyuki Enomoto, Tokyo, JP;
Youichi Hidaka, Tokyo, JP;
Daisaku Ogasahara, Tokyo, JP;
Kazuo Takagi, Tokyo, JP;
Atsushi Iwata, Tokyo, JP;
Masaki Umayabashi, Tokyo, JP;
Nobuyuki Enomoto, Tokyo, JP;
Youichi Hidaka, Tokyo, JP;
Daisaku Ogasahara, Tokyo, JP;
Kazuo Takagi, Tokyo, JP;
Atsushi Iwata, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
For eliminating a reduction in throughput in a network as a whole according to optimum path transfer technique which is the expansion of spanning tree protocol, a frame switching unit of the network has an STP control unit for, when a port state of a spanning tree is changed, notifying a table control unit of an identifier of the spanning tree and a port number of a predetermined port among the respective ports, the table control unit for setting, in a forwarding table storage unit, a received port number of a predetermined port as an output port in an entry in which a node ID is equivalent to a spanning tree identifier, and a table search unit for determining an output destination from among output ports obtained by acquisition of received frame information from a frame analysis unit.