f65a352c_Part_1__Overview___ddiguru_com__Description
[Benefit] Increased Availability [Description] 
A DNS Anycast server that becomes unavailable due to failure or routine maintenance will have very little impact on name resolution service because the service routes are withdrawn from the routing tables. Routing will divert this traffic to new alternate best path servers in the Anycast group.
Anycast DNS - Part 1, Overview - ddiguru.com
Description