bird and OSPF on p2p

[Joakim Tjernlund]

Ondrej Zajicek <santiago at crfreenet.org> wrote on 2012/08/30 15:42:50:
>
> On Thu, Aug 30, 2012 at 01:33:09PM +0200, Joakim Tjernlund wrote:
> > > Therefore, i think about putting local IP address for ptp links with ptp
> > > addresses (i.e. merging the patch i sent before). Although it could be
> > > argued that it is contrary to RFC 2328 12.4.1 [*], the ifindex value
> > > is useless and using local IP addres would fix compatibility with Quagga
> > > and Mikrotik (which seems to have the same problem).
> > >
> > > Any comments?
> >
> > That sounds like a good idea. In a way Quagga already does this as it doesn't
> > support unnumbered yet but allows /32 prefixes.
> >
> > However, it could possibly break other routers unnumbered impl. I recall
> > from when I devised the clever way to find the interface that (at least
> > for Quagga), any other method would break when using unnumbered on just
> > one side of the ppp link. I cannot remember the details now. Think
> > about it and let me know if you come to the same conclusion.
>
> I don't think it could break compatibility with other routers - ifindex
> is not propagated in any other place in OSPFv2, so even if other routers
> would expect there ifindex, they cannot compare that value to anything
> so they couldn't know that given IP address is not an ifindex. Putting
> random value instead of ifindex would probably work too.

Ahh, now I recall. It was the other way around so no problem.

 Jocke