Mac Address limiting

So, you want to limit the number of mac addresses on a ethernet port to say two. One for a phone and one for the PC.  Pretty easy to do on HP a-series:

….globally…

port-security enable

port-security timer autolearn aging 30

port-security trap intrusion

port-security timer disableport 30

...at the interface level….

port-security max-mac-count 2

port-security port-mode autolearn

port-security intrusion-mode disableport-temporarily

The switch will auto-learn the first two mac-addresses it sees on the port and then if someone insert a third device, it will disallow it and, as well, disable the port for 30 seconds.  (damn users!)