No service timestamps debug datetime msec switch0#show mac-address-tableĪnd switch running config shows no mac configured: switch0#show running-config I'm not sure where this mac-address has been kept. Now I would like to add the same mac-address to the same interface and I can't figure out how to get rid of this message: switch0(config-if)#switchport port-securityįound duplicate mac-address 00D1.5935.06D3 Switch0(config-if)#no switchport port-security mac-address 00D1.5935.06D3 Later on, I had to disable port-security and remove (I thought successfully removed) the mac address with: switch0(config-if)#no switchport port-security Switch0(config-if)#switchport port-security mac-address 00D1.5935.06D3 Switch0(config-if)#switchport port-security I ran successfully these commands: switch0(config-if)#switchport mode access I am playing around with Packet Tracer 7.3.1 in a 2950-24 switch trying to figure out how port-security works:
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