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Learn how CERN migrated their OpenStack Neutron networking from Linux Bridge to OVN in this conference talk featuring Daniel Failing, Jakub Jelinek, and Luis Fernandez Alvarez from the OpenInfra Foundation. Discover the complexities of networking infrastructure at CERN that connects scientists and engineers worldwide, machines across two data centres, and accelerator systems to the CERN Private Cloud. Understand the challenges of managing systems that have grown organically over time while working within the constraints of LHC operations schedules. Explore CERN's strategic decision to migrate from the OpenStack Neutron LinuxBridge driver to the OVN driver to future-proof their setup and align more closely with upstream code. Examine the detailed planning approach for consolidation campaigns designed to minimize impact on user activity while transitioning to a fully operational OVN installation. Gain insights from real-world experiences and lessons learned during the consolidation efforts on CERN's cloud infrastructure, including practical considerations for large-scale networking migrations in production environments.
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