* Lutz Hamann <l.hamann@diompika.org> [2007-07-28 23:24]:
> I wonder if this is really the best solution, since not all drivers
> support link_state and also tools like bgpd just use !LINK_STATE_DOWN
> as indication that a link is up.

yup, and you kinda gave the reason already, not all drivers handle link
state correctly. some hardware is not even capable of reporting it.
soin bgpd's case where we use the link state for nexthop verification,
we check wether it is not down - which means it is either up or we
don't know, in which case we cannot do anything.

the problem for trunk is different tho, I am not sure what the best
solution is.

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