Synopsis
The remote host is running a Cisco NetFlow Agent.  
Description
The remote host is running a Cisco NetFlow Agent.  NetFlow is a UDP protocol which sends sniffed traffic from a Cisco device to a Cisco collector device.  By using NetFlow, companies do not need to deploy 'taps' or utilize span (or mirror) ports.  Instead, the NetFlow agent bundles the sniffed traffic into a UDP packet and forwards to the collector.
Solution
As the NetFlow traffic is passed in plaintext, ensure that NetFlow traffic does not traverse any untrusted networks.