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Fast Packet Classification using Group Bit Vector

Author:

Tong Liu, Huawei Li, Xiaowei Li, Yinhe Han

Publisher:IEEE GLOBECOM 2006

Presenter:

Hsin-Mao Chen

Date:2010/01/06

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Outline

IntroductionGroup Bit Vector IdeaGroup Bit Vector AlgorithmLook Up The Matched RulePerformance Evaluation

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Introduction

In the BV algorithm, the length of the operation bit vector equals to the number of rules. It is too large for large size rule databases.

In the ABV algorithm, rules aggregation can reduce the length of the operation bit vector. However, it often brings false matches, which may degrade its performance.

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Group Bit Vector Idea

Create rule set.

Construct particular groups with the rule set.

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Group Bit Vector Algorithm

1.Aggregate some rules with the same selected header field as a rule set.

2.Gather some rule set as a group called parameter group (PG).

3.Construct group bit vector (gbv) with the parameter groups.

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Group Bit Vector Algorithm

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Group Bit Vector Algorithm

1.Aggregate some rules with the same selected header field as a rule set.

2.Gather some rule set as a group called parameter group (PG).

3.Construct group bit vector (gbv) with the parameter groups.

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Group Bit Vector Algorithm

S1 S2 S8

S2 S4 S7 S8

S3 S6 S8

S3 S5 S8

Maximum length=4

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Group Bit Vector Algorithm

1.Aggregate some rules with the same selected header field as a rule set.

2.Gather some rule set as a group called parameter group (PG).

3.Construct group bit vector (gbv) with the parameter groups.

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Group Bit Vector Algorithm

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Group Bit Vector Algorithm

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Look Up The Matched Rule

Packet:

(0111, 1000)

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Look Up The Matched RulePacket:

(0111, 1000)

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Look Up The Matched Rule

1111

0010

0010

AND

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Performance Evaluation

TLBV: total length of bit vector

LBV: length of the operation bit vector

TFM: times of false matches