S5(config-if)#do sh run int f0/21
Building configuration...

Current configuration : 259 bytes
!
interface FastEthernet0/21
 switchport mode access
 switchport port-security
 switchport port-security mac-address 0023.1123.4443
 speed 100
 duplex full
 storm-control broadcast level 50.00
 storm-control multicast level 62.00
 spanning-tree portfast
end