On Tue, Mar 27, 2007 at 08:33:27PM -0700, Jeremy Chadwick wrote: > In the midst of the madness, I found that when doing either of the > following commands... > > ifconfig bridge0 addm em1 > ifconfig bridge0 deletem em1 > > ...I see the entire em1 interface completely reset, bringing down link, > then up again shortly after. The logs on my switch also confirm this. > > For sake of comparison, the bge(4) driver does not behave this way. > > I am aware that if_bridge(4) enables promiscuous mode on whatever > interface is being added, ditto with -promisc on deletem. However, this > does not appear to be the cause of the problem, because I can do > "ifconfig em1 promisc" and "ifconfig em1 -promisc" without loss of link. The only other thing the bridge does to the interface when removing it is to reinstate IFCAP_TXCSUM, which is disabled when the interface is bridged. If you manually toggle this with ifconfig do you get the same result?
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