code: def _notification(self, context, method, routers, operation,
                        shuffle_agents):
          
          if extensions.is_extension_supported(self._l3plugin, L3AGENT_SCHED):
              adm_context = (context.is_admin and context or context.elevated())
              # This is where hosting device gets scheduled to Cisco cfg agent
              self._l3plugin.schedule_routers(adm_context, routers)
              self._agent_notification(
                  context, method, routers, operation, shuffle_agents)
          else:
              cctxt = self.client.prepare(topics=topics.L3_AGENT, fanout=True)
              cctxt.cast(context, method, routers=[r['id'] for r in routers])
docs: Notify all or individual Cisco cfg agents.