'Notify all the agents that are hosting the routers.'

def _notification(self, context, method, routers):

    plugin = directory.get_plugin(plugin_constants.L3)
    if utils.is_extension_supported(plugin, constants.L3_AGENT_SCHEDULER_EXT_ALIAS):
        self._agent_notification(context, method, routers)
    else:
        cctxt = self.client.prepare(fanout=True)
        cctxt.cast(context, method, routers=routers)
