i am had configure one pc to a swtich to interface 18 on the switch . also assigned switch port-security max 1 and switchport port-security violation shutdown
all port are in vlan 99. All was working fine until disconnect the cable but when i connect back the cable nothing work no shut nothing the interface dead .
this what is i saw when i did a show interface fa0/18
fastethernet0/18 down line protocol down (disabled) how do i get it up back help
Is your interface going down when you specify 100/FD? If so, the other end is probably hard coded to something that's not compatible. You shoud only have to shut/noshut the iface if it was a port security issue.
I'd try putting the port in auto (no duplex, no speed) and seeing if it comes up. When it does, check 'show int <iface>' and see what it negotiated to. If it ways 100/HD, the the other side is most likely hard coded 100/FD... if it says 100/FD then both sides are most likely auto.