Cloudflare’s perspective of the October 30 OVHcloud outage

Cloudflare reports a 17-minute OVHcloud outage on Oct 30, 2024, attributed to a BGP route leak from Worldstream (AS49981) that briefly redirected traffic and caused major drops in peered traffic, with recovery beginning minutes later. Cloudflare’s max-prefix limits automatically shut down the affected BGP session, limiting impact, and analysis suggests internal BGP reconvergence and temporary routing through Amsterdam. The postmortem confirms a misconfiguration-induced route leak, and Cloudflare recommends defenses like max-prefix limits, ASPA/RPKI validation, RFC9234, and adherence to MANRS to prevent future incidents.