> One alternative that was raised at the mic, but that has not (to my
> knowledge actually been proposed anywhere) was the use of unicast
> ND for cases when you want to configure different routes on different
> nodes.  Are there problems in this space that would not be solved by
> doing that?  If so, what are they?  If not, perhaps we need to write
> up a unicast ND mechanism?

We talked about Unicast RA in Taipei as well.   It does solve the problem, but 
it is only really useful in cases where you have a single router or a small 
number of routers that need to be configured with these unicast ND routes.   In 
a large network with many routers, the information distribution problem becomes 
truly painful.   This is a specific use case for something like a DHCP route 
option, and I was suprised not to see it mentioned yesterday.

It's true, as Jari said, that this can be accomplished in other ways, and maybe 
it would be better if it would.   If there were some better central management 
solution for populating unicast RA mappings on the router, then unicast RA 
would indeed address the exact use case that I think we care about.   But 
without the mechanism for populating routers, we still have a poorly-addressed 
use case.   And then the question is, do we want to develop a whole new 
protocol just to solve this one small problem?

It might be worth developing the protocol just to put this issue to bed.
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