BGP routes leak. Why?

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Yesterday, 20190624, a routes leak hit majors Internet player like Cloudflare, Verizon and Amazon AWS that were obfuscated by a network outage. An impressive recon and report were made by CloudFlare that early detect the problem and helped AS33154 to solve the problem. You can find the complete report here. But what happened? Briefly, it seems that a BGP protocol …