we used to use the lowest (so it is deterministic) mac address in the

system for the bridge ID for stp. That worksfine unless you have
two bridges in the system that talkto the same neighboring systems
(switches), because the two bridges on the openbsd system would have the
same ID.
fix by only looking at interfaces part of the bridge and using the lowest
mac address of these. works fine because stpcan only be enabled on
IFT_ETHER interfaces so there is always at least one and we re-evaluate
every time an interface is added or deleted from the bridge.
diff was rotting in my tree for at least a year, I have no idea what
triggered it really.
ok reyk mk djm

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