Multiplex communications – Wide area network – Packet switching
Patent
1995-03-23
1996-05-07
Lee, Thomas C.
Multiplex communications
Wide area network
Packet switching
370 8513, 364DIG1, 364229, 36424295, 364DIG2, 36494991, H04J 300, H04J 324, H04L 1246
Patent
active
055155138
ABSTRACT:
An arrangement for selective filtering, e.g. one-way filtering, of messages received by a 2-port bridge from stations connected to two LANs of an extended LAN is provided. The bridge includes a message filtering database containing the addresses of all stations connected to one of the LANs. The database also contains a list of higher-level protocols employed by the stations. Associated with each protocol-type is information used by the bridge to dispose of the message. The message filtering database comprises a single table memory capable of supporting both ports of the bridge. The selective filtering process involves a two-step analysis by the bridge to determine whether to discard the message or forward it to another port. The analysis is based on a destination address and a protocol-type of the received message.
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Gili Pat
Lomicka Jeffrey A.
Metzger Stephen D.
Vacon Gary
Digital Equipment Corporation
Dinh D.
Lee Thomas C.
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