def _notify_cfg_agent_port_update(resource, event, trigger, **kwargs):
    """Called when router port/interface is enabled/disabled"""
    original_port = kwargs.get('original_port')
    updated_port = kwargs.get('port')
    if (updated_port is not None and original_port is not None and (
       updated_port.get('admin_state_up')) != (
           original_port.get('admin_state_up'))):
        new_port_data = {'port': {}}
        new_port_data['port']['admin_state_up'] = (
            updated_port.get('admin_state_up'))
        original_device_owner = original_port.get('device_owner', '')
        if original_device_owner.startswith('network'):
            router_id = original_port.get('device_id')
            context = kwargs.get('context')
            l3plugin = bc.get_plugin(L3_ROUTER_NAT)
            if l3plugin and router_id:
                l3plugin._notify_port_update_routers(context, router_id,
                                                     original_port,
                                                     new_port_data,
                                                     'update_port_status_cfg')
Called when router port/interface is enabled/disabled