I had used the interface serial 0/0/0 with 'NO FAIR-QUEUE' command but now I seems couldn't get it out after I erase startup-config and do reload. Someone told me if I just put FAIR-QUEUE eventually will get rid but I proved it wrong, that NO FAIR-QUEUE is still in my interface serial. If anyones could help me to take this thing out of my serial interface I would really appreciated. Thanks in advance for the help.