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It works because the route to 1.2.3.4 is relatively stable. The routes would only change and end up at data center #2 if data center #1 stopped announcing the routes. In that case the connection would just re-negotiate to data center #2.


Ah, ok, that makes sense. So for a given point of origin, anycast generally routes to the same server?


Correct. From a single place, you're likely to BGP-reach one Cloudflare location, and it doesn't change often.




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