Sw Port Security

When you have your outlet ports secured with port-security so that only 2 MAC-Addresses may be visibile on the switchport, otherwise it will shutdown when a third MAC-Addresse is detected.
You will have to set port-security on the switchport by

#conf terminal
#(config) interface fa2/43 <is the linecard and poort> 
#(config-if) no switchport port-security mac-address sticky 
#(config-if) switchport port-security mac-address sticky 
#(config-if) end 
# write memory

Always check afterwards how the interface is behaving:
# show interface fa2/43
# show interface

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