> So what we recommend is using dnsdist to balance to your backends, and have
> it prefer one backend when all things are equal. Then run multiple dnsdists
> which each prefer a different backend. And then announce your dnsdist
> service addresses a few times over BGP.
+1 on this.
We moved from an all anycast resolver setup to an anycast+dnsdist,
resolver backend setup the way Bert described it.
I would add that with dnsdist and caching enabled you don't need as many
backend resolvers. 90% of the queries can be answered from dnsdist
caches. So in our case, we have multiple dnsdist instances across the
swiss NREN network but only few backend resolvers.
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