It's not just one interface. Zenoss often times will remodel our Cisco switches and detect the wrong interface speed as 10MB when it should be 100MB. Granted we have 200+ switches, but I get about 4-6 that model wrong every day. It's not consistent which switch models wrong. It's just annoying to get the errors. I don't want to drop the error, nor do I want to lock the switch/port to 100MB.
This has been going on since version 3.x of Zenoss.
I've found other people in the forum that have the same issue.
-Dannon