Re: BGP Path Selection

From: Fahad Khan (fahad.khan@gmail.com)
Date: Sun Nov 02 2008 - 06:00:43 ARST

Dear Fellow,

AS-path prepending must be configured *outboud* to take effect, since it
influences the traffic coming *inbound* to an AS.

regards,
On 11/1/08, groupstudy email <groupstudy@gmail.com> wrote:
>
> Hey Guys,
>
> Can anyone explain why the best path is the best path. As I understand it,
> ebgp is preferred over ibgp (AD of 20 for ebgp versus 200 for ibgp).
>
> I have configured a route map to prepend ASs (AS-path prepend 65218 65218
> 65218) on router1 and applied it inbound to the ebgp neighbor, but still
> this path is not preferred even though the AD of 20.
>
> There is no other config that would direct traffic to the internal
> neighbor.
>
> router1(config)#do sh ip bgp 10.70.0.0
> BGP routing table entry for 10.70.0.0/23, version 63710
> Paths: (2 available, best #1, table Default-IP-Routing-Table)
> Not advertised to any peer
> 65501 65000 65000 50002
> 10.70.128.65 from 10.70.128.65 (10.70.97.14)
> Origin incomplete, metric 0, localpref 100, valid, internal, best
> 65218 65218 65218 65218 12641 65006 65006 65006 50002
> 10.70.128.35 from 10.70.128.35 (213.15.219.7)
> Origin incomplete, localpref 100, valid, external
> router1(config)#
>
>
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-- 
Fahad Khan

Blogs and organic groups at http://www.ccie.net

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