We could, as the layering goes on, define “anycast site” as an entry into the routing system which then is apropos actual usage and less about physical interpretations or indeed the number of instances that happen to be at that anycast site. Just a thought. 



"Root server instance: A portion of a root server's infrastructure that serves root data from a particular site, which may consist of single or multiple physical devices.

Anycast instance: another name for a root server instance."

there have always been more than one routing instance of a server identity in some site.

IMHO, I didn't say otherwise in my text.  An instance is welcome to have more than one route per site.  Or maybe you're arguing that two "instances" can occur at a site.  Note that my text also didn't say "unique at a site" either.

(but my text was a starting proposal to think about, not such much final wording choices)

--

Wes Hardaker

USC/ISI

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