The OVN tunnels are set up during host installation, when
only 'ovirtmgmt' is available (no other networks are created
yet).
You can change the tunneling network for a cluster by using
the procedure described below. This will hopefully be integrated
into the UI one day.

1. Go to:
cd /use/share/ovirt-engine/playbooks

2. Execute:
ansible-playbook --private-key=/etc/pki/ovirt-engine/keys/engine_id_rsa -i /usr/share/ovirt-engine-metrics/bin/ovirt-engine-hosts-ansible-inventory --extra-vars " cluster_name=<cluster name> ovn_central=<ovn central ip> ovn_tunneling_interface=<vdsm network name>" ovirt-provider-ovn-driver.yml

Note that this only changes the settings on existing hosts.
If new hosts are added to the cluster, the procedure has to be repeated.

The OVN tunnel network can also be changed on an individual host by invoking:
vdsm-tool ovn-config <ovn central ip> <tunneling ip or network name>

Marcin


On Sun, Jul 1, 2018 at 7:03 PM, <carlgrundholm@gmail.com> wrote:
I am going to be using OVN Geneve overlay networks extensively and I expect a lot of traffic on the underlay network being used for transmission of the tunnel traffic.

In oVirt the default seems to be that the network "ovirtmgmt" is being used for the underlay network - which could cause problems for management traffic if vms are saturating the link with traffic on different OVN overlay networks.

When selecting a specific cluster, selecting "Logical Networks" and pressing the "Manage Networks" button it is possible to specify that a specific Data Center Network shall be limited to one or more of the following traffic types:
- VM Network
- Management
- Display Network
- Migration Network
- Gluster Network
- Default Route

Here I miss an option called "Underlay Network for OVN Geneve traffic" or similar.

Is there a way - e.g. by editing some configuration files on the oVirt engine and on the oVirt nodes - to divert all overlay Geneve traffic away from the management interface unto a dedicated network interface?

Carl
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