So I stumbled upon the ip flow-top-talkers feature and attempted to configure it on a 3560-X running 12.2(58)SE2. It allowed me to configure this:
ip flow-top-talkers
top 5
sort-by bytes
cache-timeout 60000
Then on the interface I am interested in:
interface GigabitEthernet0/21
ip flow ingress
Which results is (drum roll please....)
Switch#show ip flow top
% Cache is empty
No joy. So I checked the config guide for unsupported commands, these are not listed.
Then I thought maybe it had to be on a layer 3 interface (g0/21 is layer 2) so I did "ip flow ingress" on an SVI, same results.
So then I checked feature navigatore for "Flexible Netflow - Top N Talkers Support". 12.2SE is not listed, but 15.0(2)SE is.
Questions:
- Is the existence of the commands in 12.2(58)SE just an oversight? Functionality seems to almost be there, just not quite.
- Does neflow need to be enabled on a layer 3 interface or will it work on layer 2 (assuming platform support of course)
Thanks,
-Jeff