{"title":"TCAM organization for lPv6 address lookup","authors":"D. Pao","doi":"10.1109/ICACT.2005.245995","DOIUrl":null,"url":null,"abstract":"Majority of the IPv6 prefixes are 48 to 64 bits long. Conventional approach that configures the TCAM array to use 144-bit words to store IPv6 prefixes has a rather low space efficiency. Because of the limited number of I/O pins, an 128-bit IPv6 address has to be entered to the TCAM in 2 steps. If the longest matching prefix is only up to 64 bits, it may not be necessary to process the second half of the IP address. In this paper, we propose a two-level routing table organization in TCAM that can reduce the space requirement and speed up the lookup time by 40% or more. Our method is compatible with commercially available TCAM devices","PeriodicalId":293442,"journal":{"name":"The 7th International Conference on Advanced Communication Technology, 2005, ICACT 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The 7th International Conference on Advanced Communication Technology, 2005, ICACT 2005.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICACT.2005.245995","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
Majority of the IPv6 prefixes are 48 to 64 bits long. Conventional approach that configures the TCAM array to use 144-bit words to store IPv6 prefixes has a rather low space efficiency. Because of the limited number of I/O pins, an 128-bit IPv6 address has to be entered to the TCAM in 2 steps. If the longest matching prefix is only up to 64 bits, it may not be necessary to process the second half of the IP address. In this paper, we propose a two-level routing table organization in TCAM that can reduce the space requirement and speed up the lookup time by 40% or more. Our method is compatible with commercially available TCAM devices
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