Re: Query on BGP path selection

Not sure on how your are setting the attributes to the prefixes, but if
R3-R4, for the sake of argument, are announcing the same prefixes and you
are setting lp 200 to those received from R3, that will be you preferred
choice for the way out. Now when they traffic comes back to 172.16.1.0 and
assuming you are not modifying lp for this prefix on R3-R4, but setting MED
400 on R3 for it, your preferred path back will be thought R4 (lower MED),
so you'll be basically using one router R1 for your upload traffic and the
other R2 for your download traffic.

Nicolas
http://ccie-en-espanol.blogspot.com/

On Sun, Dec 13, 2009 at 10:07 AM, bhavesh ratola <bhaveshratola_at_gmail.com>wrote:

> Hi Frd's
>
> Having query in EBGP the scenario is
>
> eg:-
> R1(local preference 200)----!----- R3(MED 4000) R1-R3
> DIRECTLY CONECTED
> !
> AS 6554 ! AS 6559
> 172.16.1.0 !
> !
> !
> R2(Local preference 100)----!-----R4(MED 0 default) R2-R4
> DIRECTLY CONECTED
>
>
> R1 & R2 in same AS 6554
> R3 & R4 in same AS 6559
>
> Now query is ntwork 172.16.1.0 take which path to reach router in AS 6559
>
> Path R1 - R3 ? OR
> Path R2 - R4 ?
>
>
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Received on Mon Dec 14 2009 - 11:40:36 ART