Comment 4 for bug 1301486

I'm coming to the conclusion that a neutron port cannot be modelled as a heat resource, at least for server interfaces.

Calling nova interface-detach doesn't only detach the port from the server, it also deletes the port! Also, deleting a nova server will delete associated ports even when the port was passed in by ID.

At this point I think this needs to be added to the list of things which doesn't work during stack-update. The fix will be to extend the server networks property schema so that port properties can be specified inline, and port lifecycle is managed entirely within the server resource.