def _set_dscp_ttl_mode(self, v, load=False):
    """
    Setter method for dscp_ttl_mode, mapped from YANG variable /interface/tunnel/dscp_ttl_mode (enumeration)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_dscp_ttl_mode is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_dscp_ttl_mode() directly.
    """
    if hasattr(v, "_utype"):
      v = v._utype(v)
    try:
      t = YANGDynClass(v,base=RestrictedClassType(base_type=unicode,                                     restriction_type="dict_key",                                     restriction_arg={u'pipe': {'value': 2}, u'uniform': {'value': 1}},), is_leaf=True, yang_name="dscp-ttl-mode", rest_name="dscp-ttl-mode", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'cli-full-command': None, u'info': u'Tunnel dscp ttl mode', u'cli-full-no': None}}, namespace='urn:brocade.com:mgmt:brocade-gre-vxlan', defining_module='brocade-gre-vxlan', yang_type='enumeration', is_config=True)
    except (TypeError, ValueError):
      raise ValueError({
          'error-string': """dscp_ttl_mode must be of a type compatible with enumeration""",
          'defined-type': "brocade-gre-vxlan:enumeration",
          'generated-type': """YANGDynClass(base=RestrictedClassType(base_type=unicode,                                     restriction_type="dict_key",                                     restriction_arg={u'pipe': {'value': 2}, u'uniform': {'value': 1}},), is_leaf=True, yang_name="dscp-ttl-mode", rest_name="dscp-ttl-mode", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'cli-full-command': None, u'info': u'Tunnel dscp ttl mode', u'cli-full-no': None}}, namespace='urn:brocade.com:mgmt:brocade-gre-vxlan', defining_module='brocade-gre-vxlan', yang_type='enumeration', is_config=True)""",
        })

    self.__dscp_ttl_mode = t
    if hasattr(self, '_set'):
      self._set()