Some Questions on BIND and IPv4 Anycast

[Archimedes S. Gaviola]

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To Whom It May Concerned:
 
Anycast address is commonly used for root nameservers for geographical
failover. How does BIND handles anycast address? How to determine that
certain IPv4 address is an anycast? Does this type of address being
advertised by routers on the Internet? Or just a configuration parameter on
the underlying operating system just like with IPv6?
 
Thank you very much.
 
Sincerely Yours,
 
Archimedes S. Gaviola