[c-nsp] How to connect two VRFs on the same router? (without a loop-cable)

[Gunther Stammwitz]

[...]
> > The only way how this can be achieved seems to me to use two 
> > interfaces on the same router and to connect them with a 
> cable. This 
> > might look rather stupid when there's a cable coming out of 
> the router and going into it again.
> > 
> 
> Stupid, but quite effective. I use exactly that solution for 
> some kinds of problems.

Hello Joe,

Well that at least one had the same idea as I did and I don't feel that
stupid anymore :-)

> 
> > Isn't there a way how this can be achieved in software????
> 
> You can do the same setup via tunnels and loopbacks.

That's a really interesting option and I have thought about it too.
The problem is that each vrf hat it's own interface and they won't see each
other.

How can I build a tunnel between two ips that can't ping each other because
they are completeley separated?

Gunther