I had used the interface serial 0/0/0 with 'NO FAIR-QUEUE' command but now it doesn't seems that I could get it out. Even after I erase startup-config and do reload. Someone told me if I just put FAIR-QUEUE eventually this command will go away after you erase the startup-config & reload 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.
R1#sh run | b interface
description Engineering Department
ip address 10.1.1.1 255.255.255.0
ip ospf network point-to-point
ip address 10.1.200.1 255.255.255.0
ip ospf cost 50
ip ospf priority 10
no ip address
ip address 10.1.100.1 255.255.255.0
no fair-queue <====================== Here it is
clock rate 64000
Thx in advance for your help!