public boolean isBroadcast() {
        for (final byte b : this.address) {
            if (b != -1) {
                return false;
            }
        }
        return true;
    }
@Test
    public void testIsBroadcast() throws Exception {
        assertFalse(MAC_NORMAL.isBroadcast());
        assertTrue(MAC_BCAST.isBroadcast());
        assertFalse(MAC_MCAST.isBroadcast());
        assertFalse(MAC_MCAST_2.isBroadcast());
        assertFalse(MAC_LLDP.isBroadcast());
        assertFalse(MAC_LLDP_2.isBroadcast());
        assertFalse(MAC_LLDP_3.isBroadcast());
        assertFalse(MAC_ONOS.isBroadcast());
    }