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: [email protected]) 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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