I would really like to know in what situation you would use
the current behavior to forward back VLAN pkgs over the same interface
it was received on?
With a gigabit VLAN capable switch, 20 ports in untagged mode on distinct VLANs, 1 trunking port attached to a gigbit card in my Linux firewall, 1 trunking port to a second gigabit VLAN capable switch configured similarly in another physical location, it allows me to filter traffic between all 40 attached networks as if my Linux box had 40 network interfaces. It's a very useful combination of VLANs and bridging.
Also, I am trying to find where it states that a VLAN is considered its own
physical port. Any pointers?
A linux bridge is like a switching hub, with a separate port for every interface you add with brctl addif. All local interfaces get treated the same -- they each get their own port on the bridge -- whether a physical or virtual or sub-interface.
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