This read-write, deprecated object sets a single disposition for the entire reserved bridge MAC address range from 01:80:C2:00:00:04 through 01:80:C2:00:00:0F together, now superseded by individual per-MAC dispositions. An administrator previously used it to apply one blanket treatment across that whole reserved address block on a port. For example, setting this to discard on a legacy configuration would suppress every protocol using an address in that range that had not been given its own specific disposition.