Hi, Ondrej Thank you for explanation. One more question: is it possible to add "bgp always-compare-med" option in BIRD? Ondrej Zajicek wrote, 28.03.2011 15:31:
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.