Re: BGP Path Selection - eBGP vs iBGP

hmmm, true, my order is wrong, cant choose the winner if you dont have
candidates.

On Tue, Feb 16, 2010 at 8:17 PM, Marko Milivojevic <markom_at_ipexpert.com> wrote:
> On Tue, Feb 16, 2010 at 15:20, Ruhann <groupstudy_at_ru.co.za> wrote:
>> Agreed, the decision is not made on AD.
>> But AD however is always evaluted before the BGP selection process, or
>> any other protocols internal decision process.
>
> Actually, no. If that was true, no routes would ever be installed,
> because no router would have "best route". Internal processes happen
> first and each protocol selects their own best candidate. These
> candidates are then passed to RIB selection and each "carries" AD with
> them. So, if best route from BGP happens to be iBGP, it will go
> severely disadvantaged to the RIB selection. However, barring presence
> of cheaters with changes AD, static and connected routes, eBGP is
> guaranteed to win.
>
> For those in Europe, this is sort of like Eurosong. Each country
> selects their "best" candidate, they send them to contest and then
> there is a fair voting process, in which Eastern European country
> always wins. Just like with AD. Eastern European singers from Norway
> need not apply ;-)
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> Mailto: markom_at_ipexpert.com
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-- 
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