3com Corporation

Terry G Ahnstedt

Alexander Tomlinson

Dennis James Cox

Brian Smith

Matthew Laswell

Joseph Dempsey

Scott Strentzsch

Stephen Egbert

A system and method classifies packets with a programmably fixed network processor program and dynamically updated data structures. The network processor program selects predetermined packet field values of the packets transmitted across the network and classifies the packets by matching one or more packet field values with a data structure. New packet classifications are dynamically created by updating the data structure to associate one or more predetermined packet field values with the new packet classification. For instance, a parse tree program extracts packet header information and matches the packet header information to the data structure. A pattern tree data structure provides longest prefix matches and an ordered tree data structure provides combination matches so that classification of arbitrary Boolean combinations of extracted header fields can be formed.

System and method for dynamically constructing packet classification rules

Growing community of inventors

Austin, TX, United States of America

Terry G Ahnstedt