From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Sat Apr 22 2006 - 21:37:14 GMT-3
Only best routes. This is a loop prevention mechanism and a
method to keep the size of the global BGP table manageable. Loop
prevention because if I am routing through you and then I advertise you
a different route there is the possibility that you will also route
through me. Table size management because if you have two upstream
peers with full feeds of about 200k routes and one downstream neighbor
the downstream neighbor would learn 400k routes from you. If this were
the case the table would grow exponentially out of control.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Tony Paterra
> Sent: Friday, April 21, 2006 10:28 PM
> To: Cisco certification
> Subject: BGP table question...
>
> I was just playing with IExperts Core Lab 4 and noticed something (not
> specific to this lab). When you are passing eBGP-learned info to an
> iBGP peer, do you pass the full table or just the "best" prefix that
> was selected on the border router.
>
> ASCII Visio's....
>
> R2 (AS 200) <-----> R5 (AS 100) <----> R4 (AS 100)
> R1 (AS 200) <-----> R5 (AS 100) <----> R4 (AS 100)
>
> Basically if R5 is learning the same prefix from R1 and R2 (and they
> are both showing up in the BGP table of R5), should he pass them both
> to his iBGP peer R4 or just the best one?
>
> Thanks in advance,
> --
> Tony Paterra
> apaterra@gmail.com
>
>
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