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I am using Kolla Ansible that deploys OVN well for me.
You can set tunnel_interface to specify the tunnel interface.

Tony
> -----Original Message-----
> From: Popoi Zen <alterriu at gmail.com>
> Sent: Saturday, August 15, 2020 7:59 PM
> To: Sean Mooney <smooney at redhat.com>
> Cc: Slawek Kaplonski <skaplons at redhat.com>; openstack-
> discuss at lists.openstack.org
> Subject: Re: [neutron] How to specify overlay network interface when
> using OVN and Geneve?
> 
> Yeah, what I mean is tunnel network between instance when instance
> communicate using selfservice network, can I specify from which host
> interface/NIC that traffic goes through? I found this: `ovs-vsctl set
> open . external-ids:ovn-encap-ip=IP_ADDRESS` is it righ?
> 
> And btw, what is the best practise when using OVN? Did I need setup
> bridge for overlay interface and provider interface on my controller too?
> Since, as my understanding, inbound/outbound will have direct access
> from compute node by default on OVN. And in this guide [1] bridge only
> configured on compute nodes.
> 
> [1]
> https://docs.openstack.org/neutron/ussuri/install/ovn/manual_install.htm
> l
> 
> On Sun, Aug 16, 2020 at 1:02 AM Sean Mooney <smooney at redhat.com
> <mailto:smooney at redhat.com> > wrote:
> 
> 
> 	On Sat, 2020-08-15 at 19:36 +0200, Slawek Kaplonski wrote:
> 	> Hi,
> 	>
> 	> You can do that by configuring bridge_mappings on compute node(s).
> 	> It is described in the doc [1].
> 	when they said overlay network i think they meant the geneve
> tunnels in which
> 	casue you contole the interface that is used by adjusting your
> routing table to use the interface you desire.
> 	that can involve movein ipt to bridges or interface to  correctly
> set up the routes depending on your
> 	configurtion.
> 
> 	but ya if you were refering to provider networks the link slawek
> porovide is proably what you want.
> 	>
> 	> On Fri, Aug 14, 2020 at 09:13:23PM +0700, Popoi Zen wrote:
> 	> > Hi, I have used my google fu but I cant find any reference.
> Just want to
> 	> > know how to specify overlay network when Im using geneve as my
> overlay
> 	> > protocol?
> 	>
> 	> [1]
> https://docs.openstack.org/neutron/latest/admin/ovn/refarch/provider-
> networks.html
> 	>
> 
>