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List:       isp-bgp
Subject:    [isp-bgp] Re: bgp-can multiple border routers provide default exit
From:       Pedro R Marques <roque () sbcglobal ! net>
Date:       2003-07-31 7:58:30
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On Mon, 2003-07-28 at 11:13, padma krishnaswamy wrote:
> Greetings,
> 
> I m interested in whether and how it may be feasible
> to use BGP in an environment where transit is needed
> but TCP meshes are difficult to support. Can multiple border
> routers each advertise a default into the  AS?
> Will this at least get traffic to the outside (from within
> that AS, including anything reaching it from subtending
> domains) 
> to one of those border routers based on whichever one
> is reachable? Is there any danger of looping here?
> regards and thanks,

Is it feasible to configure tunnels between the border routers of
upstream and downstream domains ?
Either GRE or mpls would allow you to pass traffic between border
routers without forcing any intermediate routers to understand BGP
routing.

You can have both upstream and downstream border routers inject a
default and expect it to work if you are providing transit between then
if you have non-BGP speakers in the middle.

But maybe i'm missing the question completly. A ascii art diagram of
what you are trying to achieve would probably help you out a great deal
in terms of getting a an answer to your question.

regards,
  Pedro.


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