I am running port security on my 3550-48 switches and am having a weird problem.
It seems that when a user power cycles their machine the switch sometimes learns a new MAC address. It is always the same "new" mac address regardless of which pc is power cycled. The MAC address is e8be.5bd3.5558
The user swears that they are NOT plugging anything new into the switchport yet the switch learns this new MAC.
You mean to say that any PC regardless the ports when reboots is gets the same MAC on the ports. What happens after that.. does the port shut down ? What happens if you take the port-security config out of the port and check the mac-address table. is that " new " mac gets learned only on that specific port on whihc the PC reboots.
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