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As the raw flow records are processed, the data is pooled in a buffer grouped by combining the Summary Interval, the source IP address, the destination IP address and the application (which is derived from the protocol, and source and destination UDP or TCP port).  This means that if a network management server was requesting SNMP from a router, NetFlow would see each UDP get/response as a flow, which may possibly be a single packet, after summarisation, the information about the server talking to the router will still be there, and represented as a single summarised flow record, but with all the data summarised together.