[kolla][wallaby][neutron] router ha not working

Hello Everyone, I am facing an issue with router-ha in kolla wallaby. In my neutron.conf I inserted l3_ha = True max_l3_agents_per_router = 3 l3_ha_net_cidr = 169.254.192.0/18 but router ha does not work. The router namespace is present only on one of the three contrllers and if the controller goes down routing stop to work. I am using ovs and not ovn. Any help,please ? Ignazio