We have been running switchport security on our campus environment without issue for the last year or so. Lately, we have had two issues that I cannot figure out. (we are running on Catalyst 3550's IOS 12.1 (12c) EA1.
1) We are getting security violations from what appears to be bogus mac addresses. These happen (always, I think) when no on is on the computer and always recovers on the first attempt. The mac's are usually consistently one of these two:
2) Our desktop computers (all Dell) have recently gone through a refresh and some have randomly tripped port security with the Dell MAC address. I have to set it to "max 2", even thought the mac-address table only sees one mac. But... show port-security interface f0/25 says, "Total MAC addresses : 2"
Thanks in advance.