LOUP: the principles and practice of intra-domain route dissemination

  • Authors:
  • Nikola Gvozdiev;Brad Karp;Mark Handley

  • Affiliations:
  • University College London;University College London;University College London

  • Venue:
  • nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
  • Year:
  • 2013

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Under misconfiguration or topology changes, iBGP with route reflectors exhibits a variety of ills, including routing instability, transient loops, and routing failures. In this paper, we consider the intra-domain route dissemination problem from first principles, and show that these pathologies are not fundamental-rather, they are artifacts of iBGP. We propose the Simple Ordered Update Protocol (SOUP) and Link-Ordered Update Protocol (LOUP), clean-slate dissemination protocols for external routes that do not create transient loops, make stable route choices in the presence of failures, and achieve policy-compliant routing without any configuration. We prove SOUP cannot loop, and demonstrate both protocols' scalability and correctness in simulation and through measurements of a Quagga-based implementation.