If your sharing a physical interface with both tagged and untagged traffic they don't allow VM's on the untagged link.  I believe this is because some earlier versions of the bridging code in the kernel would allow pass the tagged traffic to VM's located on the untagged interface.  That being a security issue.

On Fri, Sep 4, 2015 at 9:47 AM, gregor <gregor_forum@catrix.at> wrote:
Thanks, now I can use the eth0 to connect to the web-interface and the
logical vlan network to use in a VM but I can't use the untagged VLAN1
in the VM. When I add a new logical network without VLAN tagging the
web-interface returns "Cannot have more than one non-VLAN network on one
interface."

When I create a logical network with taggged ID 1 I can't connect from a
VM to my VLAN1.

So I have to find a way to created the following networks:
- ovirtmgmt: without tagged vlan for managing -> works
- vlan1: without tagged vlan for the VM's to connect to my default
network -> currently no solution
- vlan10: tagged vlan with id 10 -> works

cheers
gregor

On 2015-09-04 18:05, Chris Liebman wrote:
> You have to edit the ovirtgmt network and un-check the "VM Network" box:
>
> Inline image 1
>
> On Fri, Sep 4, 2015 at 8:47 AM, gregor <gregor_forum@catrix.at
> <mailto:gregor_forum@catrix.at>> wrote:
>
>     Hi,
>
>     is it possible to use different VLAN with one NIC in ovirt?
>
>     I can not add a logical network configured as VLAN to my ovirtmgmt
>     interface, I get "Cannot have a non-VLAN VM network and VLAN-tagged
>     networks on one interface."
>
>     The setup for the Port is a trunk of different tagged VLAN's and the
>     default VLAN1 is untagged. Normally this work under centos where I give
>     the nic eth0 an IP and create a nic eth0.10 for the VLAN with ID 10 and
>     set an IP for it.
>
>     cheers
>     gregor
>
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