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List:       isp-bgp
Subject:    RE: how to contron route preferences to third party
From:       B N Chatterjee <bnchat () giascl01 ! vsnl ! net ! in>
Date:       2002-05-10 4:36:43
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It works  provided the community is getting re-advertised in 
between  ASes . You have to ensure this first .
The best part is community remains unaltered between ASes , and you 
just have to exploit this feature .


B.N Chatterjee  




On Thu, 9 May 2002, Khan, Amjad wrote:

> Well these work well if you are directly Peering with that neighbor.
> Here your concerned AS is three AS-Paths away......therefore, you cannot
> control their advertisements. 
> 
> Regards,
> Amjad
> 
> -----Original Message-----
> From: Nipper, Arnold [mailto:arnold@nipper.de]
> Sent: Wednesday, May 08, 2002 9:20 PM
> To: isp-bgp@isp-bgp.com
> Subject: Re: how to contron route preferences to third party
> 
> 
> There are wellknown attributes for this. Grepping thru zebra code yields:
> 
> bgp_community.h:#define COMMUNITY_NO_EXPORT             0xFFFFFF01
> bgp_community.h:#define COMMUNITY_NO_ADVERTISE          0xFFFFFF02
> 
> I.e NO_EXPORT guarantees that AS4 will not announce any prefix tagged with
> this community to outside AS4, whereas NO_ADVERTISE even guarantees that the
> router receiving the prefix will not re-announce it.
> 
> 
> Regards, Arnold
> --
> Arnold Nipper / nIPper consulting, Sandhausen, Germany
> email: arnold@nipper.de
> phone:/mobile: +49 172 2650958
> fax: +49 1212 512 364 310
> 
> 
> ----- Original Message -----
> From: "Phil Rosenthal" <winter@villaweb.net>
> To: <isp-bgp@isp-bgp.com>
> Sent: Wednesday, May 08, 2002 3:38 PM
> Subject: Re: how to contron route preferences to third party
> 
> 
> > you have to find what communities they use to control their policies.
> > --Phil
> > ----- Original Message -----
> > From: "pp_bgp" <pp_bgp@nettaxi.com>
> > To: <isp-bgp@isp-bgp.com>
> > Sent: Wednesday, May 08, 2002 1:36 AM
> > Subject: how to contron route preferences to third party
> >
> >
> > > Dear friends,
> > >
> > >
> > >                                  |
> > > myAS------AS1----AS3-----AS4----more peers
> > > |                    |                            |
> > > AS2            AS5----------------
> > >                     |
> > >             more peers
> > >
> > > Here I want AS4 should not export our routes to its peers and AS4
> > > should not prapogate my routes to others.
> > >
> > > Can I do that from my end using any BGP4 attributes.
> > >
> > > thanks
> > > pp
> > >
> > >
> > > _______________  The ISP-BGP Discussion List  ______________
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> > >
> >
> >
> >
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> >
> 
> 
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