Cloudflare’s perspective of the October 30 OVHcloud outage

Cloudflare details a 17-minute OVHcloud backbone outage on October 30, 2024, characterized by a rapid collapse of peering traffic, temporary routing shifts through Amsterdam, and partial recovery by the incident’s end. Evidence indicates a BGP route leak by Worldstream (AS49981) that breached prefix limits, triggering automatic session teardown and preventing broader impact to Cloudflare’s network. The report explains observed routing dynamics, correlates with provider notices, and recommends resilience measures including max prefix-limits, ASPA/RPKI adoption, RFC9234, and adherence to MANRS.