bird and OSPF on p2p

[Ondrej Zajicek]

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.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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