You can display and clear NetFlow statistics. NetFlow statistics consist of IP packet size distribution, IP flow cache information, and flow information such as the protocol, total flow, flows per second, and so forth. The resulting information can be used to find out information about your router traffic. To manage NetFlow statistics, use either of the following commands in privileged EXEC mode:
show ip cache flow = Display the NetFlow statistics.
clear ip flow stats = Clear the NetFlow statistics.
If your cache is still overflowing then it may simply be too small. The default cache size depends on the platform and available memory, but it's certainly not a one-size-fits-all. Yet it's one of the most overlooked aspects of netflow configuration.
Use the "ip flow-cache entries" config to adjust the cache size.
NB the cache is only resized when it's no longer in use, so you'll need to disable netflow on all your interfaces. Or reboot :-(
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...