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Mitigating BGP Route Leaks With Attributes and Communities: A Stopgap Solution for Path Plausibility

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  • Nils Höger
  • Nils Rodday
  • Gabi Dreo Rodosek

Abstract

The Border Gateway Protocol (BGP) is known to have serious security vulnerabilities. One of these vulnerabilities is BGP route leaks. A BGP route leak describes the propagation of route announcements beyond their intended scope, violating the Gao‐Rexford model. Route leaks may lead to traffic misdirection, causing performance issues and potential security risks, often due to mistakes and misconfiguration. Several potential solutions have been published and are currently greatly discussed within the Internet Engineering Task Force (IETF) but have yet to be widely implemented. One approach is the Autonomous System Provider Authorization (ASPA). In addition to these new approaches, there are also efforts to use existing BGP functionalities to detect and prevent route leaks. In this paper, we implement the Down Only (DO) Community and Only to Customer (OTC) Attribute approaches, using them isolated and in conjunction with ASPA. Our research indicates that implementing a DO/OTC deployment strategy focusing on well‐interconnected ASes could significantly reduce route leaks. Specifically, we observed mitigation of over 98% of all route leaks when DO and OTC were deployed by the top 5% of the most connected ASes. We show that combining DO/OTC and ASPA can greatly enhance ASPA's route leak prevention capabilities.

Suggested Citation

  • Nils Höger & Nils Rodday & Gabi Dreo Rodosek, 2025. "Mitigating BGP Route Leaks With Attributes and Communities: A Stopgap Solution for Path Plausibility," International Journal of Network Management, John Wiley & Sons, vol. 35(2), March.
    • Handle: RePEc:wly:intnem:v:35:y:2025:i:2:n:e70002
    DOI: 10.1002/nem.70002
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