port-security and network connectivity problem

Nightflier101BL

Hello everyone,

I'm very new to networking and am currently working on my CCNA. I've run into an interesting problem labbing with port-security on a Cisco 3550.

I've configured fa 0/31 on one of the switches as follows:

switchport mode access
switchport port-security maximum 2
switchport port-security mac-address sticky

The problem is, the moment when enable port security with the "switchport port-security" command, I immediately lose network connectivity on the PC. If I do "no switchport port-security", the connection comes back.

With port-security disabled, I can do a "show mac address-table" and I see the MAC of the PC listed at fa 0/31. When port-security is enabled, I no longer see the MAC address.

If I do "show port-security" with the port-security enabled, I do not see the anything under "CurrentAddr" for learned MAC addresses, nor do I ever see the MAC populate when I do "sh run int fa 0/31"

"terminal monitor" does not show me anything when I switch between enabled and disabled. I've tried two different PC's and two different Cisco 3550 switches and I get the same result.

I would appreciate any insight or suggestions.

Thanks!

Robert

mendysue

My guess would be that you need to enable port security and then run the above commands.