text: # Copyright (c) 2012 OpenStack Foundation.
  #
  # 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.
  
  from neutron.plugins.common import constants as p_const
  
  
  # Special vlan_id value in ovs_vlan_allocations table indicating flat network
  FLAT_VLAN_ID = -1
  
  # Topic for tunnel notifications between the plugin and agent
  TUNNEL = 'tunnel'
  
  # Values for network_type
  VXLAN_UDP_PORT = 4789
  
  # Name prefixes for veth device pair linking the integration bridge
  # with the physical bridge for a physical network
  VETH_INTEGRATION_PREFIX = 'int-'
  VETH_PHYSICAL_PREFIX = 'phy-'
  
  # The different types of tunnels
  TUNNEL_NETWORK_TYPES = [p_const.TYPE_GRE, p_const.TYPE_VXLAN]
  
  # Various tables for tunneling flows
  PATCH_LV_TO_TUN = 1
  GRE_TUN_TO_LV = 2
  VXLAN_TUN_TO_LV = 3
  LEARN_FROM_TUN = 10
  UCAST_TO_TUN = 20
  ARP_RESPONDER = 21
  FLOOD_TO_TUN = 22
  CANARY_TABLE = 23
  
  # Map tunnel types to tables number
  TUN_TABLE = {p_const.TYPE_GRE: GRE_TUN_TO_LV,
               p_const.TYPE_VXLAN: VXLAN_TUN_TO_LV}
  
  # The default respawn interval for the ovsdb monitor
  DEFAULT_OVSDBMON_RESPAWN = 30
  
  # Special return value for an invalid OVS ofport
  INVALID_OFPORT = '-1'
  