From: Evgeny Tantsura (ivgen@castel.nl)
Date: Thu Jan 09 2003 - 07:28:29 GMT-3
Solomon,
I also thought about this solution.
The only problem that you make a static route for the network you learn
from BGP neighbor.If your connection with R1 is down you'll still
advertize this summary so black hole being created.
May be you should not worry about this on CCIE LAB ?
P.S. I think it should be static null0 + BGP Conditional Advertisement
Feature, I'll test it.
Thahks
> Evgeny
> If you are allowed to create a static route then try this:
>
> ip route 122.168.1.0 255.255.240.0 Null0
>
> under bgp
> network 122.168.1.0 mask 255.255.240.0
> neighbor x.x.x.x route-map SUMMARY_ROUTE out
>
> route-map SUMMARY_ROUTE permit 10
> match ip prefix-list SUMMARY
>
> ip prefix-list SUMMARY seq 10 permit 122.168.1.0/20
>
> You don't want to use access-list because you will end up matching the
> 122.168.1.0/24 network.
>
> Solomon
>
>
> At 11:59 PM 1/8/2003 +0100, Evgeny Tantsura wrote:
> >You may not use summary word at all,
> >thus not in aggregate-address .....summary-only.
> >How would you get only the summary and suppress the rest ????
> >
> > > If the Summary word can't be used,
> > > try the "aggregate-address" option.
> > >
> > >
> > http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a0080094826.shtml
> > >
> > >
> > > Robert
> > >
> > >
> > >
> > > ------------------------------------------------
> > > On Wed, 8 Jan 2003 15:10:51 +0100 (CET), Evgeny Tantsura
> > <ivgen@castel.nl> wrote:
> > >
> > > > AS1 | AS 2
> > > > R1-----\ |
> > > > R2-----R3|-----R4 BGP - 122.168.1.0 - 122.157.10.0
> > > > |
> > > > |
> > > >
> > > > R3 receives 10 /24 networs from R4
> > > >
> > > > R1 and R2 should receive only 1 summary route, not /16
> > > > Summary word can't be used.
> > > >
> > > > Routes on R3 can't be suppressed.
> > > >
> > > >
> > > > With kind regards/ met vriendelijke groeten,
> > > > ------------------------------------------------
> > > > E. Tantsura
> > > > Network Developer
> > > > Essent Kabelcom N.V.
> > > > Dr.van Deenweg 84
> > > > 8025BN Zwolle, The Netherlands
> > > > Tel: +31-(0)38-850-7642
> > > > Fax: +31-(0)38-850-7410
> > > > Mob: +31-(0)6-290-80458
> > > > ------------------------------------------------
> > > > .
> >With kind regards/ met vriendelijke groeten,
> >------------------------------------------------
> >E. Tantsura
> >Network Developer
> >Essent Kabelcom N.V.
> >Dr.van Deenweg 84
> >8025BN Zwolle, The Netherlands
> >Tel: +31-(0)38-850-7642
> >Fax: +31-(0)38-850-7410
> >Mob: +31-(0)6-290-80458
> >------------------------------------------------
> >.
With kind regards/ met vriendelijke groeten,
------------------------------------------------
E. Tantsura
Network Developer
Essent Kabelcom N.V.
Dr.van Deenweg 84
8025BN Zwolle, The Netherlands
Tel: +31-(0)38-850-7642
Fax: +31-(0)38-850-7410
Mob: +31-(0)6-290-80458
------------------------------------------------
.
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