text: #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  ###################################
  # Agent extension related constants
  ###################################
  # Extension driver type for Open vSwitch mech driver
  OVS_EXTENSION_DRIVER = 'ovs'
  # Extension driver type for Linux Bridge mech driver
  LB_EXTENSION_DRIVER = 'linuxbridge'
  # Extension driver type for macvtap mech driver
  MACVTAP_EXTENSION_DRIVER = 'macvtap'
  # Extension driver type for SR-IOV mech driver
  SRIOV_EXTENSION_DRIVER = 'sriov'
  
  
  # Agent states as detected by server, used to reply on agent's state report
  # agent has just been registered
  AGENT_NEW = 'new'
  # agent is alive
  AGENT_ALIVE = 'alive'
  # agent has just returned to alive after being dead
  AGENT_REVIVED = 'revived'
  