def _set_spf6_interval(self, v, load=False):
    """
    Setter method for spf6_interval, mapped from YANG variable /routing_system/router/isis/router_isis_cmds_holder/address_family/ipv6/af_ipv6_unicast/af_ipv6_attributes/spf6_interval (list)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_spf6_interval is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_spf6_interval() directly.
    """
    if hasattr(v, "_utype"):
      v = v._utype(v)
    try:
      t = YANGDynClass(v,base=YANGListType("spf6_interval_level",spf6_interval.spf6_interval, yang_name="spf6-interval", rest_name="spf-interval", parent=self, is_container='list', user_ordered=False, path_helper=self._path_helper, yang_keys='spf6-interval-level', extensions={u'tailf-common': {u'info': u'SPF calculation Timers', u'cli-full-no': None, u'callpoint': u'IsisSpf6Interval', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-suppress-mode': None, u'cli-suppress-key-abbreviation': None, u'cli-incomplete-command': None, u'alt-name': u'spf-interval'}}), is_container='list', yang_name="spf6-interval", rest_name="spf-interval", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'info': u'SPF calculation Timers', u'cli-full-no': None, u'callpoint': u'IsisSpf6Interval', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-suppress-mode': None, u'cli-suppress-key-abbreviation': None, u'cli-incomplete-command': None, u'alt-name': u'spf-interval'}}, namespace='urn:brocade.com:mgmt:brocade-isis', defining_module='brocade-isis', yang_type='list', is_config=True)
    except (TypeError, ValueError):
      raise ValueError({
          'error-string': """spf6_interval must be of a type compatible with list""",
          'defined-type': "list",
          'generated-type': """YANGDynClass(base=YANGListType("spf6_interval_level",spf6_interval.spf6_interval, yang_name="spf6-interval", rest_name="spf-interval", parent=self, is_container='list', user_ordered=False, path_helper=self._path_helper, yang_keys='spf6-interval-level', extensions={u'tailf-common': {u'info': u'SPF calculation Timers', u'cli-full-no': None, u'callpoint': u'IsisSpf6Interval', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-suppress-mode': None, u'cli-suppress-key-abbreviation': None, u'cli-incomplete-command': None, u'alt-name': u'spf-interval'}}), is_container='list', yang_name="spf6-interval", rest_name="spf-interval", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'info': u'SPF calculation Timers', u'cli-full-no': None, u'callpoint': u'IsisSpf6Interval', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-suppress-mode': None, u'cli-suppress-key-abbreviation': None, u'cli-incomplete-command': None, u'alt-name': u'spf-interval'}}, namespace='urn:brocade.com:mgmt:brocade-isis', defining_module='brocade-isis', yang_type='list', is_config=True)""",
        })

    self.__spf6_interval = t
    if hasattr(self, '_set'):
      self._set()