From: pauldongso (pauldongso@hotmail.com)
Date: Mon Aug 18 2003 - 19:24:04 GMT-3
Can you pls specify the peering relationship first? If r5 peer with r3
and r2, there won't be any loop. If r5 peers with r3 only, there will
loop. Then use backdoor command in r5 for prefix learned from as20, in
that case, r5 will choose the path learned from ospf via r2 instead of
the path learned from bgp via r3.
Is this the answer you are after?
Paul
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Peng Zheng
Sent: Tuesday, 19 August 2003 1:37 AM
To: default@connect.com.au; ccielab@groupstudy.com
Subject: RE: BGP question
Yes. I think so. But there is a route loop for routes
from AS 20.
R5 goes to R3 and R3 goes to R5.
--- pauldongso <pauldongso@hotmail.com> wrote:
> Hi Peng
>
> As the question is not that clear, I can only make a
> guess.
>
> Since r4 is not part of the bgp, any bgp prefix
> needs to be
> redistributed to ospf to make r4 aware of their
> existence before full
> reachability is achieved.
>
>
> Paul
>
> =================================================
>
> Topology as:
>
> R3
> |
> R4
> |
> R5-----R2---R1
> | |
> R6 (AS 20)
>
> OSPF run among them.
>
> Now R1, R2, R3 in AS 1, R2 as Route Reflector.
> Without
> BGP on R4. R5 in AS 2.
>
> Reqiurement:
>
> R3 and R6 propagate their lo 1 into BGP,
> They are 199.100.1.0 and 199.101.1.0
>
>
> 1. routes from AS 20 needed to be reachable from all
> BGP routers.
>
> 2. routes for lo 1 of R3 and R6 should be reachable
> from any routers runing BGP.
>
> 3. propagate only one route into AS 2 for lo 1 of R3
> and R6.
>
> 4. routes from AS 20 should be appeared as BGP
> routes
> on all BGP routers.
>
> How to satisfy all these at the same time?
>
>
>
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