Efficient TCAM Encoding Schemes for Packet Classification using

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Efficient TCAM Encoding Schemes for Packet Classification using Gray Code Authors: Yeim-Kuan Chang and

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. 1

Outline n n Introduction Related Works Proposed range encoding shemes Performance 2

Outline n n Introduction Related Works Proposed range encoding shemes Performance 2

Introduction A traditional solution for storing ranges in TCAM is the direct range-to-prefix conversion

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. 3

Elementary intervals 4

Elementary intervals 4

Direct range-to-prefix & Elementary intervalbased encoding scheme Direct range-to-prefix conversion: EX: R 2 =

Direct range-to-prefix & Elementary intervalbased encoding scheme Direct range-to-prefix conversion: EX: R 2 = [2 6] 00010 For tatal: 0 0 0 1 * 00011 17 5 -bit prefix 00100 0010* 00101 00110 Elementary interval-based encoding scheme: EX: R 2 = [1 1] 0001 For tatal: R 3 = [4 7] 6 4 -bit prefix 0100 0101 01** 0110 0111 5

Parallel packet classification encoding (PPCE) scheme 6

Parallel packet classification encoding (PPCE) scheme 6

Proposed Range Encoding Schemes 7

Proposed Range Encoding Schemes 7

Proposed Range Encoding Schemes (cont. ) 8

Proposed Range Encoding Schemes (cont. ) 8

BRGC range group The following rules are satisfied: n no range is disjoint from

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

Perfect BRGC range group (cont. ) 10

Perfect BRGC range group (cont. ) 10

Imperfect BRGC range groups 11

Imperfect BRGC range groups 11

Many-to-one code assignment n The many-to-one code assignment scheme achieves the goal of using

Many-to-one code assignment n 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. 12

One-to-many code assignment n The one-to-many code assignment scheme extends the use of a

One-to-many code assignment n 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 13

Performance 14

Performance 14

Performance (cont. ) 15

Performance (cont. ) 15

Energy Efficient Multimatch Packet Classification with TCAM FangEnergy Efficient Multimatch Packet Classification with TCAM Fang
Efficient Low Power Packet Classification by Grouping TCAMEfficient Low Power Packet Classification by Grouping TCAM
Scalable MultiMatch Packet Classification Using TCAM and SRAMScalable MultiMatch Packet Classification Using TCAM and SRAM
Encoding Short Ranges in TCAM Without Expansion EfficientEncoding Short Ranges in TCAM Without Expansion Efficient
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TCAM Ternary Content Addressable Memory 1 Introduction TCAMTCAM Ternary Content Addressable Memory 1 Introduction TCAM
TCAM Ternary Content Addressable Memory 1 Introduction TCAMTCAM Ternary Content Addressable Memory 1 Introduction TCAM
Encoding Storage ENCODING STORAGE Encoding Storage My QsEncoding Storage ENCODING STORAGE Encoding Storage My Qs
VOIP Packet loss packet labeling and packet classificationVOIP Packet loss packet labeling and packet classification
Character Encoding Handling doubles Pepper Character encoding schemesCharacter Encoding Handling doubles Pepper Character encoding schemes
Fast Packet Classification Using Multi Dimensional Encoding AuthorFast Packet Classification Using Multi Dimensional Encoding Author
Efficient Gray Code Based Range Encoding Schemes forEfficient Gray Code Based Range Encoding Schemes for
Efficient Gray Code Based Range Encoding Schemes forEfficient Gray Code Based Range Encoding Schemes for
On Finding an Optimal TCAM Encoding Scheme forOn Finding an Optimal TCAM Encoding Scheme for