Network configuration UI for UDN allows users to connect primary UDN as a secondary network

rc.4

Always

1. Create a VM in a UDN project
2. Go to network config
3.

It is possible to add a primary UDN network as a secondary network

Primary UDNs are not even listed as options in the network selection. The only way to request it is by selecting the "Pod network", and even that must be possible only once per VM