Re: [homenet] draft-boutier-homenet-source-specific-routing-00

[Henning Rogge <[e-mail]>]

On Wed, Jul 10, 2013 at 6:26 PM, Juliusz Chroboczek
<[e-mail]> wrote:
> Consider the following topology:
>
>   -- A -- X -- B --
>        \     /
>         - Y -
>
> A is announcing (::/0, alpha), B is announcing (::/0, beta).  X is
> source-specific.  Y is a legacy router.

Okay.

> Suppose now that rather than dropping the source-specific routes, Y is
> casting them into non-specific default routes, and that it has
> selected A as its next hop for the default route.

Y is just announcing that it only does forward normal traffic, its not
part of the "source-specific" topology.

> Now X crashes:
>
>   -- A         B --
>        \     /
>         - Y -
>
> A's routing table is now just (::/0, alpha) and (::/0, ::/0), with the
> latter pointing at Y.  But Y is still pointing its default route at A,
> so you're in trouble.

I think its the same issue/misunderstanding we had in the last post.
The question if traffic for an unspecific source-address can go out of
any gateway or not. If it can go out of any gateway, A will just take
the traffic and forward it to the external gateway without asking Y.

What do you think?

Henning Rogge

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