old_contents: """Constants to be used across NAPALM drivers."""
  
  from __future__ import unicode_literals
  
  CONFIG_LOCK = True  # must be changed soon!
  TIMEOUT = 60  # seconds
  
  INTERFACE_NULL_SPEED = -1
  
  BGP_NEIGHBOR_NULL_COUNTER = -1
  
  SNMP_AUTHORIZATION_MODE_MAP = {
    'read-only': 'ro',
    'read-write': 'rw'
  }
  
  ROUTE_COMMON_PROTOCOL_FIELDS = [
      'destination',
      'prefix_length',
      'protocol',
      'current_active',
      'last_active',
      'age',
      'next_hop',
      'outgoing_interface',
      'selected_next_hop',
      'preference',
      'inactive_reason',
      'routing_table'
  ]  # identifies the list of fileds common for all protocols
  ROUTE_PROTOCOL_SPECIFIC_FIELDS = {
      'bgp': [
          'local_as',
          'remote_as',
          'as_path',
          'communities',
          'local_preference',
          'preference2',
          'remote_address',
          'metric',
          'metric2'
      ],
      'isis': [
          'level',
          'metric',
          'local_as'
      ],
      'static': [  # nothing specific to static routes
      ]
  }
  
  TRACEROUTE_NULL_HOST_NAME = '*'
  TRACEROUTE_NULL_IP_ADDRESS = '*'
  
  OPTICS_NULL_LEVEL = '-Inf'
  
  PING_SOURCE = ''
  PING_TTL = 255
  PING_TIMEOUT = 2
  PING_SIZE = 100
  PING_COUNT = 5
  
new_contents: """Constants to be used across NAPALM drivers."""
  
  from __future__ import unicode_literals
  
  CONFIG_LOCK = True  # must be changed soon!
  TIMEOUT = 60  # seconds
  
  INTERFACE_NULL_SPEED = -1
  
  BGP_NEIGHBOR_NULL_COUNTER = -1
  
  SNMP_AUTHORIZATION_MODE_MAP = {
    'read-only': 'ro',
    'read-write': 'rw'
  }
  
  ROUTE_COMMON_PROTOCOL_FIELDS = [
      'destination',
      'prefix_length',
      'protocol',
      'current_active',
      'last_active',
      'age',
      'next_hop',
      'outgoing_interface',
      'selected_next_hop',
      'preference',
      'inactive_reason',
      'routing_table'
  ]  # identifies the list of fileds common for all protocols
  ROUTE_PROTOCOL_SPECIFIC_FIELDS = {
      'bgp': [
          'local_as',
          'remote_as',
          'as_path',
          'communities',
          'local_preference',
          'preference2',
          'remote_address',
          'metric',
          'metric2'
      ],
      'isis': [
          'level',
          'metric',
          'local_as'
      ],
      'static': [  # nothing specific to static routes
      ]
  }
  
  TRACEROUTE_TTL = 255
  TRACEROUTE_SOURCE = ''
  TRACEROUTE_TIMEOUT = 2
  TRACEROUTE_NULL_HOST_NAME = '*'
  TRACEROUTE_NULL_IP_ADDRESS = '*'
  
  OPTICS_NULL_LEVEL = '-Inf'
  
  PING_SOURCE = ''
  PING_TTL = 255
  PING_TIMEOUT = 2
  PING_SIZE = 100
  PING_COUNT = 5
  
subject: Define traceroute header constants