I'm currently having the same problem on a couple of different sites running different hardware - one is a 1600, one is an 837.
The issue is that the DHCP bindings table keeps filling up when it should not. On closer inspection it becomes evident that there are multiple addresses being assigned to the same MAC address.
The addresses shown in the bindings are longer than I would expect, though - they seem to be of the form 01, then the MAC, then a varying bunch of hex digits. It is these hex digits that vary between each of the erroneously assigned bindings. Unless I manually clear these out of the table, users are unable to pick up IPs.
I can't seem to find any option in the IOS to ignore the client ID (or whatever it is that is shown after the MAC), and I'm not sure why it is seeing different ones in the first place.
Any pointers would be gratefully received!
