> RA preference is very useful in the following very
> simple situations.
> your slide did not cover this, i believe this scenario
> is the most
> popular case.
itojun, yes the router selection mechanisms will definitely help your
scenario. I didn't focus on this scenario in my discussion because I
feel the most challenging scenarios have different administrators for
the routers, and your scenario most likely involves a single
administrator who can coordinate the configuration.
Thanks,
Rich
> a host is on a non-leaf network.
> - if we throw RA from router A only, we will lose
> connectivity to "leaf"
> if router A goes down.
> - if we throw RA from both router A and B, we have lots of
> icmp6 redirect
> if router B is picked as the default outgoing router for host C.
>
> so what you will want to do is:
> - set RA preference as router A > router B, advert from both.
>
> upstream
> |
> router A
> |
> ==+===============+==
> | |
> router B host C
> |
> leaf
>
>
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