Christian,

> So, I would suggest that we study a tunnel solution to enable topology hiding 
> and large site multi-homing.

RFC4864 suggests a few ways to approach topology hiding
in section 4.5. I actually think the 'topology masking
router' is cleaner than tunnelling.

As for multihoming, do you have a proof-of-concept proposal
other than PI/BGP4+, LISP or SHIM6? Because we've been looking
for ten or fifteen years.

   Brian
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