I have a Cisco ASA 5515 and a 2921 ISR that I have configured to receive netflow data from. Both devices have been working perfectly for several months. All of a sudden, both devices stopped sending netflow packets at about the same time. I performed an #clear ip flow stats on the 2921, and it appears to be working again. I can find no such command for the ASA. I rebuilt the configuration for netflow on the ASA with no success. Does netflow fill up the cache after a while and stop sending flows? Is there any way to configure some kind of circular logging for such data? Is there any way to clear the cache on the ASA appliance?