The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2004
Filed:
Oct. 23, 2000
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A flexible and high-performance packet classification algorithm. The algorithm includes converting the original rule database into rule mapping table format for storage. The method of producing the rule mapping table includes partitioning an input key into a plurality of sub-keys, and sequentially comparing various grouping combinations of each sub-key with the same sub-key field of each rule. Finally, the results are stored in the rule mapping table using a bit-map method. This invention provides a packet classification algorithm that support a plurality of rule databases or sub-tables such that the co-existence of a plurality of rule databases each having a different length and width in the same search engine is permitted. In addition, the design can provide actual improvements (higher speed, smaller volume occupation) and flexibility (possible coexistent of different rule databases). Moreover, the search method can be used as a general-purpose search engine in the design of network processor or in any situation when rapid search is necessary. The search method can serve even as a replacement technology for CAM.