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Efficient Gray Code Based Range Encoding Schemes for Packet Classification in TCAM

Efficient Gray Code Based Range Encoding Schemes for Packet Classification in TCAM. Author: Yeim-Kuan Chang, Cheng-Chien Su, and Yung-Chieh Lin Publisher: Submit to Transactions on Computers Presenter: Chun-Yi Li Date: 2008/12/24. Outline. Preliminary Related Works EIGC

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Efficient Gray Code Based Range Encoding Schemes for Packet Classification in TCAM

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  1. Efficient Gray Code Based Range Encoding Schemes for Packet Classification in TCAM Author:Yeim-Kuan Chang, Cheng-Chien Su, and Yung-Chieh Lin Publisher:Submit to Transactions on Computers Presenter: Chun-Yi Li Date: 2008/12/24

  2. Outline Preliminary Related Works EIGC Perfect-BRGC (P-BRGC) Performance 2

  3. Preliminary Buddy Code & BRGC : Elementary interval 3

  4. Related Works • Database independent & database dependent • Direct range-to-prefix conversion: • Database independent scheme • Convert each range to prefixes • ex:R=[1,14] prefix = 0001, 001*, 01**, 10**, 110*, 1110 • Ternary string(Boolean expression) 4

  5. Related Works Elementary interval based encoding R1=0101, 0110 R2=0001 R3=01** R4=0011, 010* 5

  6. Related Works Parallel packet classification encoding

  7. Proposed Range Encoding Scheme Scheme based on Elementary Interval and BRGC (EIGC) Assign each elementary interval a identifier by using BRGC Default elementary interval have the same code. 7

  8. Proposed Range Encoding Scheme Scheme based on Perfect BRGC Range Sets (P-BRGC) Definition1:Any range in the set must intersect at least one of the other ranges Definition2:A perfect BRGC range sets satifies (1)Each range contain 2n elementary intervals (2)Two intersection range A and B in the set, share elementary interval must be equal to half of the number of elementary interval contained in either A or B. 8

  9. Perfect BRGC range sets 9

  10. Perfect BRGC range sets • Virtual endpoint insert • Should limit the number of virtual endpoints 10

  11. Perfect BRGC range sets • Insert a range into layers 11

  12. Performance 12

  13. Performance 13

  14. Performance – All rules 14

  15. Performance - Non-prefix rules 15

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