In message 
<CAAedzxp1R-C5E9RJVMVLRJxPc0w4zooPtqnvWK9eggpZu4=x...@mail.gmail.com>, Erik 
Kline writes:
> I vote no, please don't make it MUST.
> 
> Among other things, if my home edge router losing it's upstream it (in
> theory) doesn't have to deprecate the global prefix in the home, just
> the default route.  Since I can't get to the Internet anyway, all I
> need is (almost) any prefix, and the one I have is as good as a ULA
> (if not better, since the upstream loss may just be a flap).

Deprecating the prefix doesn't make it unusable.   However by not
having a ULA prefix already you have the problem about when to
instantiate a ULA prefix.  You shouldn't be using a prefix beyond
the time it is delegated to you.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: [email protected]

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