That's an interesting expectation. As co-author of the planned deprecation draft, I'd been assuming a more classical deprecation action, in which we would simply state the previous semantics of FEC0::/10, state that the prefix SHOULD NOT be used, but leave it permanently assigned by IANA.
This would break nothing that runs today.
What do people think?
The meaning of "deprecated" was discussed both in the meeting and on the mailing list as indicating that the prefix would NOT be reallocated. So, I think that the prefix should be set-aside as deprecated and reserved...
Otherwise, we could have some enterprises receive global allocations in space that some implementations treat as site-local addressing. Not good.
Margaret
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