BIRD: route selection question

[Ondrej Zajicek]

On Mon, Mar 28, 2011 at 01:46:50PM +0400, Mikhail A. Grishin wrote:
> Hi,
>
> Why in the example below, the route via 194.226.100.51 is the best?
>
> According http://bird.network.cz/?get_doc&f=bird-6.html#ss6.1
> Route selection rules
> ...
> "Prefer the lowest value of the Multiple Exit Discriminator."

As specified by BGP standard, MED is used to compare routes only if they
came from the same neighboring AS [*]. These came from a different ones
(20632 and 3277), so MED is not used and they are probably compared
by router ID, time of route or similar low-priority criteria.


[*] Perhaps it is not explicitly mentioned in documentation, but it is a
standard BGP behavior.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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