Abstract
Today's packet classification systems are designed to provide the highest-priority matching result, such as the longest prefix match, even if a packet matches multiple classification rules. However, new network applications demanding multimatch classification - that is, requiring all matching results instead of only the highest-priority match - are emerging. Ternary content-addressable memory is becoming a common extension to network processors, and its capability and speed make it attractive for high-speed networks. The proposed TCAM-based scheme produces multimatch classification results with about 10 times fewer memory lookups than a pure software approach. In addition, their scheme for removing negation in rule sets saves up to 95 percent of the TCAM space used by a straightforward implementation.
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