BGP route selection

Ondrej Zajicek santiago at crfreenet.org
Tue Apr 17 14:20:20 CEST 2018


On Tue, Apr 17, 2018 at 10:50:24AM +0000, Arvin Gan wrote:
> Hi,
> I notice that there is a description of route selection algorithm:
> 
>   The global best route selection algorithm is (roughly) as follows:
> 
>   *   Preferences of the routes are compared.
>   *   Source protocol instance preferences are compared.
>   *   If source protocols are the same (e.g. BGP vs. BGP), the protocol's route selection algorithm is invoked.
>   *   If source protocols are different (e.g. BGP vs. OSPF), result of the algorithm is undefined.

>   And I also notice that normally the  configuration  "Administrative
> Distance"  that is mapped to preference under channel  in bird  is
> different between eBGP (default  value 20) and iBGP (default value 200).

Hi

No, default value is 200 for both EBGP and IBGP. Where did you noticed 20?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."


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