conf t

errdisable recovery cause psecure-violation
errdisable recovery interval 30

interface fastEthernet 0/10
 switchport port-security
 switchport port-security mac-address sticky
exit

interface fastEthernet 0/11
 switchport port-security
 switchport port-security mac-address 1234.1234.1234
exit

interface fastEthernet 0/12
 switchport port-security
 switchport port-security maximum 2
 switchport port-security mac-address 1234.1234.1234
 switchport port-security mac-address 4321.4321.4321
exit