Hello Tomáš:

You need to follow the steps in [1]:

* You need to create the new physical bridge "br-ex2".

* Then you need to add to the bridge the physical interface.

* In the compute node you need to add the bridge mappings to the OVN database Open vSwitch register

* In the controller, you need to add the reference for this second provider network in "flat_networks" and "network_vlan_ranges" (in the ml2.ini file). Then you need to restart the Neutron server to read these new parameters (this step is not mentioned in this link).

$ cat ./etc/neutron/plugins/ml2/ml2_conf.ini

[ml2_type_flat]

flat_networks = public,public2

[ml2_type_vlan]

network_vlan_ranges = public:11:200,public2:11:200

Regards.

[1]https://docs.openstack.org/networking-ovn/pike/admin/refarch/provider-networks.html

On Tue, Mar 7, 2023 at 12:33 AM Tomáš Bredár <tomas.bredar@gmail.com> wrote:

Hi,

I have a running production OpenStack deployment - version Wallaby installed using TripleO. I'm using the default OVN/OVS networking.
For provider networks I have two bridges on the compute nodes br-ex and br-ex2. Instances mainly use br-ex for provider networks, but there are some instances which started using a provider network which should be mapped to br-ex2, however I didn't specify "bridge_mappings" on ml2_conf.ini, so the traffic wants to flow through the default datacentre:br-ex.
My questions is, what services should I restart on the controller and compute nodes after defining bridge_mappings in [ovs] in ml2_conf.ini. And if this operation is safe and if the instances already using br-ex will lose connectivity?

Thanks for your help

Tomas