We turned on port security on all of our switches and limited the number of MAC addresses per port. Recently we noticed a problem that occurs with our 3548s where if one port picks up a MAC address (and subsequently stores in its table), that same MAC can't be moved anywhere else. Our 3550s are not affected by this. This can be a pain with users who have laptops and they move from cubicle to cubicle. I tried turning on auto-aging on those switches but it doesn't appear to work. The address is still retained on that port. I had to manually shut down the port where the mac address was last attached to in order for it to connect to another. I don't know if there is a limitation with 3548s or if there is a workaround where we can keep port security on yet the mac address tables should be dynamic (getting rid of addresses it no longer detects OR allows it to traverse from port to port).
- posted
18 years ago