From: Peng Zheng (zpnist@yahoo.com)
Date: Mon Aug 18 2003 - 23:02:19 GMT-3
r5 peer with r3 only.
AS 1: r1, r2, r3.
AS 2: r5
AS 3: r6
IBGP peers: r1 and r2, r2 and r3 (not r1 and r3) in AS
1.
EBGP peers: r3 and r5, R5 and r6
--- pauldongso <pauldongso@hotmail.com> wrote:
> 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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>
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