We already have a KCS https://access.redhat.com/solutions/7077367 but since it's supported since 17.1.4 the request is to include the config option as part of documentation. Also for upgrade as we have seen Customers hitting this issue couple of times already so documenting can avoid some issues in production.

It can be configured using template parameters:-

parameter_defaults:
  <Controller role>ExtraConfig:
    neutron::config::plugin_ml2_config:
      ovn/broadcast_arps_to_all_routers:
        value: false