Hi Jeroen
Outside of the domain this signal gets split, and both VLAN sets head of to their separate destination domains.
This is still unclear to me. How do you split Ethernet packets travelling on a single cable that are tagged with different vLANs? This can only occur in a Ethernet device (the Switching Matrixi in my example). I do not see how you do it otherwise. So your port needs to go to one other Ethernet port (portB in my example)
At this point you have splitted the vlans and proceed 'normally toward the to the two domains (via portC and portD in my example).
What you describe is what I meant with my third possibility, adding a virtual node.
The Switching Matrix is the virtual node, you mean?
PS. This problem, and many others like it is why I would have preferred to have a single layer schema first. We're still hammering out the details of the basic elements, but already we're opening new cans of worms left and right with the problems of describing multi-layer topologies. True:-)
Paola ps = in case we take this offline...