[c-nsp] IGP & iBGP Configuration Problem in Transit AS

[Ibrahim Abo Zaid]

Hi Vira


the simplest solution for both problem i can think about is GRE tunnels
between A , G , H headed at A which will act as RR as well

best regards
--Ibrahim

On Mon, Jun 16, 2008 at 12:20 PM, Vira W <muarwi at gmail.com> wrote:

> Hi Cisco gurus,
>
>
> I have a network topology in this URL :
> http://www.4freeimagehost.com/show.php?i=3f0ac19164c9.png
>
>  My first problem is in IGP configuration inside AS 100. I'm using OSPF. I
> still confused how to make non-BGP router (C,E,B,D) understand how route
> the
> packet transitting this AS. I have tried default route advertisement via
> OSPF, but since AS 100 is multihomed, there still any chance looping is
> happened there. How to configure it properly, without redistributing BGP
> route into OSPF.
>
> Second, I understand that iBGP inside AS 100 needs to be configured in mesh
> topology. Otherwise, use route reflector or confederation. But, if I use
> route reflector, I'm confused because the each route reflector itself must
> be meshed, in the other side, from the physical topology (as in the
> picture), there is none router that is connected mesh. So, which router
> should I choose as RR. Then, if I choose BGP confederation, still inside
> sub-AS the router must be connected in mesh topology, which impossible from
> the topology.
>
> So guys, what is your suggestion for my problem in IGP and iBGP
> configuration inside AS 100?
> I've read many books about BGP, particularly about transit AS, but their
> examples is always simple networks. I have found none complex case study
> network similar my topology.
>
> Thanks a lot. Every your comment, suggestion, criticism, will be very much
> appreciated.
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