[ovs-discuss] Collecting NetFlow data

[Ben Pfaff]

On Thu, May 19, 2016 at 06:17:45PM +0200, Syed Faraz Ali wrote:
> Hello Ben,
> 
> Thanks for the prompt response.
> 
> Please have the output from the logs. Below are the logs related to
> collector, I'm not sure if its related to NetFlow collector or used in some
> other context. Kindly suggest further.
> 
> *cat /var/log/openvswitch/ovs-vswitchd.log | grep collector*
> 2016-05-19T16:05:02.575Z|00955|collectors|WARN|Dropped 7 log messages in
> last 46 seconds (most recently, 6 seconds ago) due to excessive rate
> 2016-05-19T16:05:02.575Z|00956|collectors|WARN|sending to collector failed:
> Connection refused
> 2016-05-19T16:06:03.099Z|00957|collectors|WARN|Dropped 11 log messages in
> last 56 seconds (most recently, 6 seconds ago) due to excessive rate
> 2016-05-19T16:06:03.099Z|00958|collectors|WARN|sending to collector failed:
> Connection refused
> 2016-05-19T16:07:03.098Z|00959|collectors|WARN|Dropped 11 log messages in
> last 56 seconds (most recently, 6 seconds ago) due to excessive rate
> 2016-05-19T16:07:03.098Z|00960|collectors|WARN|sending to collector failed:
> Connection refused

This tends to indicate that the NetFlow packets got back ICMP port
unreachable errors.