The problem for sites arises if different ISPs give them different
prefix lengths --- that will really mess things up at the subnet
level.
No, you just zero out the prefix to the length that applies for that
connection. As long as your subnetting fits within the longer
prefix, you're still fine. If not, then you need a shorter prefix...
You do realize this requires a lot of site changes. Readdressing
routers and doing longest match after the 6 bytes. Then the question
is what if you want to use variable length subnet masks across your
domain, etc.
There are a lot of administrative changes to make this work. If people
are doubting the usefulness of Loc/ID split, adding more cost for the
benefit will cause more resistance.
Dino
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