> >I think it was recognized a long time ago that the initial deployment
> >of A6 records should be limited to two (or at most 3) levels. ...
>
> I see... it is unfortunate RFC2874 does not cover it.
> it has A6 reference from leaf customer A6 record to ISP A6 record,
> and 5 levels of indirection.
<blockquote>
Until more deployment experience is gained with the A6 record, it is
recommended that prefix delegations be limited to one or two levels.
A reasonable phasing-in mechanism would be to start with no prefix
delegations (all A6 records having prefix length 0) and then to move
to the use of a single level of delegation within a single zone. (If
the TTL of the "prefix" A6 records is kept to an appropriate duration
the capability for rapid renumbering is not lost.) More aggressively
flexible delegation could be introduced for a subset of hosts for
experimentation.
</blockquote>
Just to drill down a bit, let me repeat:
<blockquote>
Until more deployment experience is gained with the A6 record, it is
recommended that prefix delegations be limited to one or two levels.
</blockquote>
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