From: robbie (robbie@packetized.org)
Date: Tue Jul 26 2005 - 20:34:27 GMT-3
Why not 'ip unnumbered loopback <Area 1 RID>' on R2, for the tunnel
interface connecting to Area115 on SW1?
Gustavo Novais wrote:
> Hello
>
> Often (as is my case now) we find that the solution for a specific
> problem is tunneling. In this case specific, I have a area 115 which is
> connected to a tottaly stubby area 15, which in turn is connected to
> area 1, which in turn is connected to area 0. (twisted minds who
> invented this scenario)
>
> (Area115)---SW1---(area 15 TS)---R2---(Area1)---R5----Backbone
>
> So to solve this, what I have done (one possible solution) is to vlink
> R2 to R5, and tunneled Sw1 to R2, putting the tunnel interfaces on both
> ends on area 115.
>
> In order to do this I had to invent a new IP addressing to put on the
> tunnel interfaces. My question is, can we do that on a lab environment?
>
> Honestly I think not. So, how can we work around this not using new IP
> addressing? IP unnumbered seems obvious, but the problem here is that
> the source interface belongs already to another area, area 15. As area
> 15 is totally stubby we can only see a default coming from R2, so at the
> first moment we start running OSPF over the tunnel, we will see
> specifically our tunnel source ( reminding that no matter what the
> metric, a specific route is always preferred over a default route)
> through the tunnel and everything will collapse due to recursive
> routing. The only solution I found to this was to use tunnel source and
> destination as physical directly connected interfaces VLAN on SW1 and
> F0/0 on R2. But as I said earlier those interfaces already belong to an
> area... so how will we use IP innumbered here to extend area 115 (which
> needs to be connected to the backbone, or like, as is R2 through
> Vlink).?
>
> It was just a question I put to myself as I happily invented new
> networks as I saw fit, and thought " what about in the lab?"
>
> Any thoughts are welcome.
>
> Thank you
>
> Gustavo
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
-- Cheers, Robbie
This archive was generated by hypermail 2.1.4 : Sun Sep 04 2005 - 17:00:31 GMT-3