RFC 3954, "Cisco Systems NetFlow Services Export Version 9", October 2004

Errata ID: 2979
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Paul Aitken
Date Reported: 2011-09-26
Verifier Name: Nevil Brownlee
Date Verified: 2012-03-12

Section 5.1 says:

   Source ID
         A 32-bit value that identifies the Exporter Observation Domain.
         NetFlow Collectors SHOULD use the combination of the source IP
         address and the Source ID field to separate different export
         streams originating from the same Exporter.

It should say:

   Source ID
         A 32-bit value that identifies the Exporter Observation Domain.
         NetFlow Collectors SHOULD use the combination of the source IP
         address, source port, and the Source ID field to separate different export
         streams originating from the same Exporter.

Notes:

Addition of "source port" to separate multiple export streams.

This is already addressed in RFC5101 (IPFIX) as so:

Collecting Processes SHOULD use the Transport Session and the
Observation Domain ID field to separate different export streams

NB transport session = address + ports.

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