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

3. 3 Preliminary Buddy Code & BRGC : Elementary interval

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 2 n 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. 10  Virtual endpoint insert  Should limit the number of virtual endpoints

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