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Efficient TCAM Encoding Schemes for Packet Classification using Gray Code

Efficient TCAM Encoding Schemes for Packet Classification using Gray Code. Authors: Yeim-Kuan Chang and Cheng-Chien Su Publisher: the IEEE Globecom 2007 conference Present : Chen-Rong Chang Date: December , 10, 2008. Department of Computer Science and Information Engineering

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Efficient TCAM Encoding Schemes for Packet Classification using Gray Code

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  1. Efficient TCAM Encoding Schemes for Packet Classification using Gray Code Authors:Yeim-Kuan Chang and Cheng-Chien Su Publisher:the IEEE Globecom 2007 conference Present:Chen-Rong Chang Date:December, 10, 2008 Department of Computer Science and Information Engineering National Cheng Kung University, Taiwan R.O.C.

  2. Outline • Introduction • Related Works • Proposed range encoding shemes • Performance

  3. Introduction • A traditional solution for storing ranges in TCAM is the direct range-to-prefix conversion which individually converts each range into multiple prefixes. • A set of encoding schemes called parallel packet classification encoding (PPCE) is proposed based on the concept of elementary intervals.

  4. Elementary intervals

  5. Direct range-to-prefix & Elementary interval-based encoding scheme Direct range-to-prefix conversion: EX: R2 = [2 6] 0 0 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 1 0 1 0 0 1 1 0 Elementary interval-based encoding scheme: EX: R2 = [1 1] 0 0 0 1 R3 = [4 7] 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 For tatal: 17 5-bit prefix 0 0 0 1 * 0 0 1 0 * 0 0 1 1 0 For tatal: 6 4-bit prefix 0 1 * *

  6. Parallel packet classification encoding (PPCE) scheme

  7. Proposed Range Encoding Schemes

  8. Proposed Range Encoding Schemes (cont.)

  9. BRGC range group The following rules are satisfied: • no range is disjoint from the other ranges in the group • each range covers exactly consecutive elementary intervals • theidentifiers assigned to these intervals can be merged into one ternary string Perfect range group: it covers 2d – 1 valid elementary intervals which need 2d – 1 distinct identifiers.

  10. Perfect BRGC range group (cont.)

  11. Imperfect BRGC range groups

  12. Many-to-one code assignment • The many-to-one code assignment scheme achieves the goal of using only one ternary string to encode a range by assigning more than one code to an elementary interval.

  13. One-to-many code assignment • The one-to-many code assignment scheme extends the use of a common code from the default elementary intervals to the valid elementary intervals by assigning a common code to the valid elementary intervals covered by the same subset of original ranges

  14. Performance

  15. Performance (cont.)

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