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The Border Gateway Protocol (BGP), the de-facto Internet interdomain routing protocol, disseminates information about Internet prefixes to Autonomous Systems (ASes). Prefixes are announced and withdrawn as routes and policies change, making them unreachable from portions of the Internet for certain time periods. This paper aims to predict routing failures of prefixes in the Internet. The authors investigate the similarity of prefixes in the Internet with respect to their propensity to fail, i.e., become unreachable. Given a prefix of interest, they define a "BGP molecule" - the prefixes in the Internet that are likely to fail together with this prefix.
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