Communication apparatus and methods

Details Communication apparatus and methods Communication apparatus and methods

1993-07-19

1996-05-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 17, 370 941, H04L 1246, H04L 1226

Patent

active

055153763

ABSTRACT:
A multi-port packet-based bridge is described in which packet transmissions on particular ports or between ports may be monitored on another, monitoring port. Efficient operation is realized by using a multi-processor environment and data structures that allow a packet received on one port to be transmitted to multiple ports without being "copied" multiple times. By using a Supervisory Access Terminal, it is possible to specify various circumstances under which a packet will be sent to the monitoring port. These circumstances include monitoring of all packets incoming to a selected port (or ports), all packets forwarded to a selected port (or ports), and packets generated internally and sent to a selected port (or ports). In addition, all packets forwarded from one selected port to another selected port may be monitored. Port monitoring is supported by particular data structures that promote efficient dispatching of packets and by a Bridging Cache that retains the results of recent dispatch calculations. Similar techniques are applied to multi-port routers.

REFERENCES:
patent: 3938144 (1976-02-01), Pederson et al.
patent: 4817080 (1989-03-01), Soha
patent: 4920529 (1990-04-01), Sasaki et al.
patent: 5151897 (1992-09-01), Suzuki
patent: 5274631 (1993-12-01), Bhardwaj

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