[c-nsp] ebgp vs ibgp admin distance

[david.ponsdesserre at uk.bnpparibas.com]

you sure it not

router bgp XXXX
>          bgp deterministic-med
>          no synchronization
>          no auto-summary
>          distance BGP 200 200 200


On the other hand is that a best practice for Vrf Environment ( MPLS)  when
the same prefix is learn via Ebgp ( ad=20 )  and Mibgp ( ad=200 ) because
of a backdoor

Those prefixes are coming from two different Bgp As , therefore the command
bgp deterministic-med is not usefull .....

The command bgp always-compare-med is may be the more appropriate one on
that case ...



Let me know what you think .
Rgds
David






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Agreed to this... Philp Smith (Cisco) also recomended the same ... as best
practice.


Shakeel


On 8/11/06, sthaug at nethelp.no <sthaug at nethelp.no> wrote:
>
> > Routes are matched against BGP best path selection. If you have same
> > metrics/variables of a prefix received via eBGP and iBGP, eBGP will
win.
> >
> > Then onto admin distance, 20 for ebgp, 200 for ibgp.
>
> I have seen several places where Cisco recommends setting admin distance
> the same (200) for both EBGP and IBGP. A Cisco BGP workshop held in
> Stockholm, Sweden in February 2003 (by Alvaro Retana and Daniel Walton)
> recommended the following BGP template:
>
>         router bgp XXXX
>          bgp deterministic-med
>          no synchronization
>          no auto-summary
>          distance 200 200 200
>
> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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