From: Evgeny Tantsura (ivgen@castel.nl)
Date: Wed Jan 08 2003 - 20:02:58 GMT-3
You should configure all this on R3
The only way to do thisi kan think about is a static route to null
interface and filter out all the rest.
But then "black hole" is created...I would never do such a think in a real
network.
> If I've interpreted it correctly
>
> On R3 use the aggregate address command
> aggregate-address 122.160.0.0 255.224.0.0
>
> as not allowed to use the summary-only keyword, and can't supress any routes
>
> so would use route-maps on neighbor routers.
>
> < route-map in >on R1 &R2 and filter the specifics using extended
> access-list to avoid using all the specifics indiviually
>
> access-list 101 deny ip 192.160.0.0 0.31.255.255 host 255.255.255.0
> access-list 101 permit ip any any
>
> on r4 in filter the summary coming back in.
>
> Yasser
>
> > -----Original Message-----
> > From: Evgeny Tantsura [SMTP:ivgen@castel.nl]
> > Sent: Wednesday, January 08, 2003 2:11 PM
> > To: ccielab@groupstudy.com
> > Subject: BGP summary
> >
> > 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
------------------------------------------------
.
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