def _start_core(self, settings):
        # Get common settings
        routing_settings = settings.BGP.get('routing')
        common_settings = {}

        # Get required common settings.
        try:
            common_settings[LOCAL_AS] = routing_settings.pop(LOCAL_AS)
            common_settings[ROUTER_ID] = routing_settings.pop(ROUTER_ID)
        except KeyError as e:
            raise ApplicationException(
                desc='Required minimum configuration missing %s' %
                     e)

        # Get optional common settings
        common_settings[BGP_SERVER_PORT] = \
            routing_settings.get(BGP_SERVER_PORT, DEFAULT_BGP_SERVER_PORT)
        common_settings[REFRESH_STALEPATH_TIME] = \
            routing_settings.get(REFRESH_STALEPATH_TIME,
                                 DEFAULT_REFRESH_STALEPATH_TIME)
        common_settings[REFRESH_MAX_EOR_TIME] = \
            routing_settings.get(REFRESH_MAX_EOR_TIME,
                                 DEFAULT_REFRESH_MAX_EOR_TIME)
        common_settings[LABEL_RANGE] = \
            routing_settings.get(LABEL_RANGE, DEFAULT_LABEL_RANGE)

        # Start BGPS core service
        waiter = hub.Event()
        call('core.start', waiter=waiter, **common_settings)
        waiter.wait()

        LOG.debug('Core started %s', CORE_MANAGER.started)
        # Core manager started add configured neighbor and vrfs
        if CORE_MANAGER.started:
            # Add neighbors.
            self._add_neighbors(routing_settings)

            # Add Vrfs.
            self._add_vrfs(routing_settings)

            # Add Networks
            self._add_networks(routing_settings)
Starts BGPS core using setting and given pool.
dataset/ETHPy150Open osrg/ryu/ryu/services/protocols/bgp/application.py/RyuBGPSpeaker._start_core