Document link:

https://docs.redhat.com/en/documentation/red_hat_openstack_platform/17.1/html/configuring_red_hat_openstack_platform_networking/use-azs-make-network-nodes-ha_rhosp-network#config-network-service-azs-ovn_config_azs

Details:

Above document includes an example to set multiple OVNAvailabilityZone parameter like OVNAvailabilityZone: 'az-central,az-datacenter2,az-datacenter1' .

However, this parameter will not set az-datacenter2/az-datacenter1 availability zone as expected.

This parameter modifies external-ids:ovn-cms-options and colon separated strings are required for openvswitch option like external-ids:ovn-cms-options="enable-chassis-as-gw,availability-zones=az-central:az-datacenter2:az-datacenter1" as documented in  [1].

When we specified OVNAvailabilityZone parameter according to doc example, external-ids:ovn-cms-options will be set like external-ids:ovn-cms-options="enable-chassis-as-gw,availability-zones=az-central,az-datacenter2,az-datacenter1".

I've tested on my env and colon separated  OVNAvailabilityZone parameter is setting multiple NetworkAZ as I expected.

Thus document example should be changed from comma separated to colon separated.

 [1] https://docs.openstack.org/neutron/wallaby/admin/ovn/router_availability_zones.html