Hello,   Don't know if you already resolved your problem, but I had exactly the same issue and for me the solution was to re-enable CDP on the interface configuration...   So I had the command "no cdp enable" on my interface and as soon as I configur...

I have exactly the same question : is it possible to have a syslog message when an Ip source guard event occurs on a switch 2960 ?Is anyone can help us ?