Switchport Operational Mode Down

[Jonathan Kaplan]

I found the problem, but what does it mean, and how do I fix it?

S3#show interfaces fastEthernet 0/18 switchport 
Name: Fa0/18
Switchport: Enabled
Administrative Mode: static access
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 20 (Students)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Appliance trust: none

[jj27]

Operational mode down means that nothing is plugged into it that is active at the moment.

[shine pothen]

Operational Mode : down means the port is down/nothing connected    it can be either of the ends

you can also use the command 

sh interface fastethernet0/18

and you will get more information like

from when the last input/output happened

media type,whether anything is connected and many more information.