The access of the ELAN to configure requests. A
'closed' ELAN (similar to a closed user group) is
prevented from being used as the default ELAN and also
may not be asked for in the LE_CONFIGURE_REQUEST
solely by ELAN name. As such only clients that
provide an ATM address or MAC address that has been
configured for the 'closed' ELAN will be given
returned a successful LE_CONFIGURE_RESPONSE.