From: Andy (and123and@googlemail.com)
Date: Thu Mar 13 2008 - 07:22:26 ARST
Hi
are you limited to as to how you advertise the prefixes into BGP by a
previous task? If not then you can redistribute the prefixes in to BGP
giving them a "?" as the origin by defualt, and then setting a route-map on
R1 to R4 to change the origin to "igp" making it more preferred than "?".
hth
-A
On 13/03/2008, Ed Lui <edwlui@gmail.com> wrote:
>
> Just labbed it up quickly. it doesn't seem like a reliable solution. :-(
>
> On Thu, Mar 13, 2008 at 12:59 AM, Ed Lui <edwlui@gmail.com> wrote:
>
> > Emil,
> >
> > router bgp 123
> > aggregate-address 172.16.1.1 255.255.255.255 summary-only
> > aggregate-address 172.16.3.3 255.255.255.255 summary-only
> >
> > I believe this will satisfy the requirement.
> >
> > HTH,
> >
> > Lui
> >
> >
> > On Wed, Mar 12, 2008 at 11:18 PM, YourPal <dearprudence28@gmail.com>
> > wrote:
> >
> > > Hi Group,
> > >
> > > I came across the following BGP scenario:
> > >
> > > R1, R2, and R3 are in AS 123. They are fully-meshed. R4 is in AS 456.
> R4
> > > peers with R1 and R2.
> > >
> > > R1 advertises 172.16.1.1/32 into BGP.
> > > R2 advertises 172.16.2.2/32 into BGP.
> > > R3 advertises 172.16.3.3/32 into BGP.
> > >
> > > Configure R1 so that R4 prefers R1 to reach 172.16.1.1/32 and
> > > 172.16.3.3/32.
> > > Route filtering and AS path manipulation are prohibited.
> > >
> > > The way I see it, I'm left with the option of configuring MED. However
> > > since
> > > the task restricts the config to be done on only R1, AFAIK there's no
> > > way to
> > > influence MED because both R1 and R2 will advertise the prefixes to R4
> > > with
> > > MED=0 (unless I'm allowed to configure a higher MED value on R2).
> > >
> > > Can't think of a solution. I may be missing something. Appreciate any
> > > help.
> > >
> > >
> > > Thank you.
> > >
> > > BR,
> > > Emil
> > >
> > >
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