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[shihanzhang <shihanzhang@xxxxxxxxxx>]

** Changed in: neutron
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1413123

Title:
  L3 agent does not check if "external network bridge"  exist at its
  begining

Status in OpenStack Neutron (virtual network service):
  Invalid

Bug description:
  Now the l3 agent check whether the ''external network bridge'' exist
  at loop:

      def _process_router_if_compatible(self, router):
          if (self.conf.external_network_bridge and
              not ip_lib.device_exists(self.conf.external_network_bridge)):
              LOG.error(_LE("The external network bridge '%s' does not exist"),
                        self.conf.external_network_bridge)
              return

  I think it is better to check this at l3 agent begin:
  _check_config_params(self)

  if the ''external network bridge'' does not exist, l3 agent should
  exit!

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