I have enabled ip accounting on a Cisco 7613 router interface and ip account-threshold in global configuration.  When I perform the "show ip accounting" command the table is empty!  I can see that traffic is flowing across the interface, but my accounting table is still empty. Attached is the show version, partial configuration with the IP accounting information, and the output from "show ip accounting". I've enabled ip accounting on various platforms in the past without issues, but never on a 7613. Any assistance would be greatly appreciated.