From: Mahmud, Yasser (YMahmud@Solutions.UK.ATT.com)
Date: Wed Jan 08 2003 - 23:48:18 GMT-3
The only way then I can think of is as you said that is to create the
aggregate using aggregate-address on R3 and then use route-map on R3 to
filter the specific routes to R1 &R2 and interpret that filtering is not the
same as supressing, As route supressing on r3 means that r3 is supressing
the route completely and won't go any neighbor at all. but filtering is only
to specific neighbors ????? .
Yasser
> -----Original Message-----
> From: Evgeny Tantsura [SMTP:ivgen@castel.nl]
> Sent: Wednesday, January 08, 2003 11:03 PM
> To: Mahmud, Yasser
> Cc: ccielab@groupstudy.com
> Subject: RE: BGP summary
>
> 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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