Method and apparatus for processing data packets in a network

Details Method and apparatus for processing data packets in a network Method and apparatus for processing data packets in a network

1995-10-04

1998-08-04

Olms, Douglas W.

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

370389, 370394, H04J 324

Patent

active

057905541

ABSTRACT:
A method and apparatus for filtering data packets from a network device, such as a LAN switch, onto a network coupled thereto based on the content of the data packets. A pattern is defined and a forwarding action performed on data packets whose contents match or do not match the pattern, according to a specified condition. Filters may be configured on a per port basis, i.e., a filter can be applied to data packets entering or exiting a specific port on a networking device such as a LAN switch. A data packet received or transmitted at a port of a network device whose contents meet a condition specified by a filter may be processed in a number of ways: the packet may be forwarded to a normal destination port according to normal forwarding rules, forwarded to additional destination ports, forwarded to a monitor destination port, dropped, or subjected to another filter. The next filter may define a different forwarding action for data packets that do not meet the condition specified by the present filter.

REFERENCES:
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patent: 5398245 (1995-03-01), Harriman, Jr.
patent: 5432907 (1995-07-01), Picazo, Jr. et al.
patent: 5530703 (1996-06-01), Liu et al.
patent: 5594728 (1997-01-01), Hershey et al.
"Create Access Lists," pp. 17-18, Chapter 5--Managing the System, Router Products Configuration Guide, Cisco Systems.
"Filter Transparently Bridged Packets," pp.10-11, Chapter 21--Configuring Transparent Bridging, Cisco Systems.

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