Matthew Petach wrote:

With an anycast setup using the same IP addresses in every
location, returning SERVFAIL doesn't have the same effect,
however, because failing over from anycast address 1 to
anycast address 2 is likely to be routed to the same pop
location, where the same result will occur.

That's why that is a bad idea. Alternative name servers with
different IP addresses should be provided at separate locations.

                                                Masataka Ohta

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