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Performance Improvement of Two-Dimensional Packet Classification by Filter Rephrasing

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4 Author(s)
Pi-Chung Wang ; Nat. Chung Hsing Univ., Taichung ; Chun-Liang Lee ; Chia-Tai Chan ; Hung-Yi Chang

Packet classification categorizes incoming packets into multiple forwarding classes in a router based on predefined filters. It is important in fulfilling the requirements of differentiated services. To achieve fast packet classification, a new approach, namely ldquofilter rephrasing,rdquo is proposed to encode the original filters by exploiting the hierarchical property of the filters. Filter rephrasing could dramatically reduce the search and storage complexity incurred in packet classification. We incorporate a well-known scheme-rectangle search-with filter rephrasing to improve the lookup speed by at least a factor of 2 and decreases 70% of the storage expenses. As compared with other existing schemes, the proposed scheme exhibits a better balance between speed, storage, and computation complexity. Consequently, the scalable effect of filter rephrasing is suitable for backbone routers with a great number of filters.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:15 ,  Issue: 4 )

Date of Publication:

Aug. 2007

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