一种基于匹配域裁剪的包分类规则集压缩方法

孙鹏浩; 兰巨龙; 陆肖元; 胡宇翔; 马腾

doi:10.11999/JEIT160740

一种基于匹配域裁剪的包分类规则集压缩方法

doi: 10.11999/JEIT160740

1.
(国家数字交换系统工程技术研究中心郑州 450002) ②(上海未来宽带技术及应用工程研究中心上海 200336)

基金项目:

国家973计划项目(2012CB315901)，国家自然科学基金(61521003)，国家863计划项目(2013AA013505)

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出版历程
- 收稿日期: 2016-07-11
- 修回日期: 2017-02-08
- 刊出日期: 2017-05-19

Field-trimming Compression Model for Rule Set of Packet Classification

1.
(National Digital Switching System Engineering &
2.
(Shanghai Engineering Research Center for Broadband Technologies &

Funds:

The National 973 Program of China (2012CB315901), The National Natural Science Foundation of China (61521003), The National 863 Program of China (2013AA013505)

摘要

摘要: 随着以OpenFlow为代表的多匹配域包分类规则的出现，匹配域数量的不断增加、流表宽度的不断增大以及流表规模的不断膨胀，大大增加了硬件存储的压力。为提高现有三态内容可寻此存储器(TCAM)资源利用率，该文提出一种基于规则集特征分析的匹配域裁剪模型Field Trimmer。一方面基于对规则集中匹配域的逻辑关系分析，实现匹配域的合并, 从而减少匹配域的数量；另一方面基于对规则集统计规律的分析，实现匹配域的裁剪，使用部分匹配域来达到整体的匹配效果。实验结果表明，相比于其他方案，该方案在较小的时间复杂度下，能够进一步节省OpenFlow流表的TCAM存储空间需求50%左右；对于常见的包分类规则集，该方案所需的储存空间能够节省40%以上。
- 包分类 /
- 三态内容可寻此存储器 /
- OpenFlow
Abstract: With the emergence of multi-field packet classification such as OpenFlow, the increasing number of match fields, continuous growth in bit-width of entries and ever growing scale of rule set all bring much pressure on the storage space in hardware. To improve the utilization of the existing Ternary Content Addressable Memory (TCAM) resources, a match field reduction scheme Field Trimmer is proposed based on the analysis of rule feature. On the one hand, with the analysis of logical relationships among different match fields, some fields can be merged to reduce the number of match fields. On the other hand, with the analysis of statistical features in a rule set, some of the match fields are picked up to achieve the classification function of the whole set. Experiment result shows that with less algorithm complexity, the proposed scheme can save around 50% storage space in the rule set of OpenFlow compared to the best prior art, and about 40% storage space in the popular 5-tuple packet classification rule set.
- Packet classification /
- Ternary Content Addressable Memory (TCAM) /
- OpenFlow

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参考文献(21)

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