Hello; I'm having some hard time getting my oVirt cluster back to work, after 
the last update to 4.2.6.

One thing that does not work anymore is VLAN Trunks; before the update, the 
cluster was running in OVS mode, and I could define logical networks without 
VLAN tag; then, networks packets got forwarded to the guest as "tagged".

Right now version 4.2.6 won't allow me to assign the (OVS) Logical network to 
the guest NICs anymore, but it insists that I use a vNIC profile from an 
external provider.

First question: Is this expected? Must I really work with externally provided 
networks only?

Anyway, for the vNIC interfaces that only carry untagged traffic, I was able to 
define an external OVN network, connect it to the corresponding "Data center 
Network", and everything works as it did before. But the "trick" does not work 
for "trunk" interfaces that should carry VLAN tagged traffic.

So to the second (main) question? How is this to be solved? Is there a way to 
define a VLAN trunk under OVN? Or is there a way to pickup a Data Center 
logical network to attach to the vNIC as we did before?

Thanks in advance for your help!
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