Thank you for your reply :). 

I don't think is the network filters, i have also created a new OVN network to check but still the vm dont boot-up on the hosts that have been upgraded. 


On Fri, 1 Feb 2019, 21:56 Dominik Holler <dholler@redhat.com wrote:
On Fri, 1 Feb 2019 15:31:18 +0200
ada per <adaper3@gmail.com> wrote:

> After upgrading my hosts from 4.2.7.1 to 4.2.8 the external networks
> stopped working!
> When im starting a VM using external network it does not boot up at
> all!!!!!
>
> The error message is:
> "VM  is down with error. Exit message: unsupported configuration:
> filterref is not supported for network interfaces with virtualport
> type openvswitch"
>

Can you please ensure that the vNIC profiles of the external network
has no network filter?
Please find details in https://bugzilla.redhat.com/1502754 .
The default setting for new created OVN networks should be
"No Network Filter", but there might be old networks which still have
an network filter.

> I rolled it back to 4.2.7.1 for 1 of my hosts just as a test and the
> VMs on that host can now bootup using external networks as they are
> supposed to!!
>
> Please advice as i would like to use the upgrade!!!