Apparatus for filtering multicast messages transmitted between subnetworks based upon the message content

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United States of America Patent

PATENT NO 5933605
SERIAL NO

08745665

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Abstract

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A network system includes at least one computer which includes a processor for processing data and attaching an associated contents code corresponding to the processed data and data group information indicative of a data group corresponding to the attributes of the processed data to ask a data transmission request and a transmission controller connected to the processor for controllably transmitting a frame including the transmission sub-network, the contents code and the processed data to the first sub-network according to the data group information of the processed data. A second computer connected judges whether or not the contents code of the frame received from the first sub-network conforms to one of a plurality of data reception enable/disable judgement conditions. A third computer judges whether or not the contents code of the frame received conforms to one of a plurality of data reception enable/disable judgement conditions, and storing the received frame having the contents code conforming to one of the plurality of data reception enable/disable judgement conditions. The second computer includes a filter in which the contents codes differently set for respective sub-networks are stored and which changes the contents code contained in the received frame to the contents code set for the receiving sub-network.

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Patent Owner(s)

Patent OwnerAddress
HITACHI LTDTOKYO 100-8280

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iizuka, Tamio Hitachi, JP 2 157
Kawano, Katsumi Kawasaki, JP 61 1449
Kawano, Shigeki Yokosuka, JP 17 206
Wataya, Hiroshi Hitachinaka, JP 9 423

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