def _set_protocol_type(self, v, load=False):
    """
    Setter method for protocol_type, mapped from YANG variable /mpls_state/ldp/tunnels/ldp_tunnels/protocol_type (mpls-protocol-type)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_protocol_type is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_protocol_type() directly.

    YANG Description: Protocol Type
    """
    if hasattr(v, "_utype"):
      v = v._utype(v)
    try:
      t = YANGDynClass(v,base=RestrictedClassType(base_type=unicode,                                     restriction_type="dict_key",                                     restriction_arg={u'staticp': {'value': 0}, u'ldp': {'value': 2}, u'rsvp': {'value': 1}},), is_leaf=True, yang_name="protocol-type", rest_name="protocol-type", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, namespace='urn:brocade.com:mgmt:brocade-mpls-operational', defining_module='brocade-mpls-operational', yang_type='mpls-protocol-type', is_config=False)
    except (TypeError, ValueError):
      raise ValueError({
          'error-string': """protocol_type must be of a type compatible with mpls-protocol-type""",
          'defined-type': "brocade-mpls-operational:mpls-protocol-type",
          'generated-type': """YANGDynClass(base=RestrictedClassType(base_type=unicode,                                     restriction_type="dict_key",                                     restriction_arg={u'staticp': {'value': 0}, u'ldp': {'value': 2}, u'rsvp': {'value': 1}},), is_leaf=True, yang_name="protocol-type", rest_name="protocol-type", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, namespace='urn:brocade.com:mgmt:brocade-mpls-operational', defining_module='brocade-mpls-operational', yang_type='mpls-protocol-type', is_config=False)""",
        })

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