code: def _remove_redundancy_routers(self, context, router_ids, ports,
                                     delete_ha_groups=False):
          
          subnets_info = [{'subnet_id': port['fixed_ips'][0]['subnet_id']}
                          for port in ports]
          for r_id in router_ids:
              for i in range(len(subnets_info)):
                  self.remove_router_interface(context, r_id, subnets_info[i])
                  LOG.debug("Removed interface on %(s_id)s to redundancy router "
                            "with %(r_id)s",
                            {'s_id': ports[i]['network_id'], 'r_id': r_id})
                  # There is only one ha group per network so only delete once
                  if delete_ha_groups and r_id == router_ids[0]:
                      self._delete_ha_group(context, ports[i]['id'])
              self.delete_router(context, r_id)
              LOG.debug("Deleted redundancy router %s", r_id)
docs: Deletes all interfaces of the specified redundancy routers
          and then the redundancy routers themselves.