On Wed, Feb 06, 2013 at 10:42:38PM +0100, Arnold Nipper wrote: > On 04.02.2013 11:21, Ondrej Zajicek wrote: > > On Tue, Jan 29, 2013 at 06:09:04PM +0100, Arnold Nipper wrote: > >> Does anyone know what "preferred" in the context of > > > > Number of imported routes that are chosen in routing tables as best. > > > > Note that contrary to 'imported' counter, in 'preferred' counter a > > route is counted once for each routing table where it is best. > > > > Understand ... > > Q: what is this information useful for? Clearly imported <= preferred
That is not true - if you receive two routes for the same network from different BGPs/protocols (in one table), the just one is selected as best/preferred and propagated further. For the other, the preferred counter is not increased. So if you have BGP session that has zero preferred counter (and non-zero imported counter) you could shut it down and know that it does not change your routing (unless you use 'deterministic med' option, where removing non-best route could cause changing the best route, but that is some completely different issue). -- 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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