Scalability is definitely a challenge. The worst case is when you have a
very large number of zones sharing the same ANAME target, and that changes
address. If ANAME is implemented using existing standard protocol features
(i.e. UPDATE, NOTIFY, IXFR) as specified, then the change of address is
going to cause a huge volume of modification traffic. But the "as if"
clause exists to allow large scale implementations to do clever things to
mitigate this.
Add operational considerations section that covers this.
Add operational considerations section that covers this.