From: Leigh Harrison (ccileigh@gmail.com)
Date: Tue Jul 25 2006 - 07:12:17 ART
Hey there Victor,
Not 100% sure that I understand the scenario.
If all of your nodes are running an IGP and passing round the loopback
addresses, then you'll be able to create a full mesh bgp setup with no
problems. Remember: BGP does not send updates in the same way as other
routing protocols, they are passed via tcp (I think it's port 139, but
can't remember off the top of my head), so all you need is a path to
your neighbour and you should be fine.
For configuration it may depend what kind of AS's you're running. If
it's a single one and there are multiple AS's connected via the other
nodes, then you would have to do some tweaking depending on how you want
traffic to move in and out of the AS.
When you create the bgp connection using your neighbour commands, it's
quite like there being a tunnel, because it runs over tcp, the bgp
process will only see it's neighbour and not the path it uses to get
there. All of the routes will be passed over the tcp connections.
Hope that helps - but then again, I may have misunderstood your scenario!!
LH
Victor Cappuccio wrote:
> Hi Guys, I know this is a very newbie question, but it keeps spinning in my
> head.
>
> Ok this is the dilemma
>
> R1 --- R3 ---- R2
>
> R1-R2-R3 runs any IGP.
>
> R1 and R2 are running BGP in AS 12 and they peer via each other Loopback
> Address (/32 BTW).
>
> So, I need to solve the Non-BGP Transitive Device Problem, I know that I can
> use tunnels or maybe redistribute BGP routes at R2 and R1.
>
> But the question is more difficult (for me at least); say that I add another
> 2 BGP Devices connected to R3
>
> R5
> .
> .
> R1 ------ R3 ------ R2
> .
> .
> R4
>
> I need to create a full mesh BGP Session between R1; R2; R5; R4 using their
> loopbacks Address (/32 BTW).
>
> So creating tunnels here is out of the game, because you can not add extra
> Ip addressing.
>
> Now redistributing the BGP Routes to the current IGP, would NOT help me if I
> need to create some AS Policies. - Like Local Preference.
>
> Maybe MPLS would solve the problem (do not know how to configure, and I
> think that would be out of the scope of the CCIE Lab for now)
>
> Any recommendations for this particular problem?
>
> Thanks
> Victor.-
>
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