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RFC 5473, "Reducing Redundancy in IP Flow Information Export (IPFIX) and Packet Sampling (PSAMP) Reports", March 2009

Source of RFC: ipfix (ops)
See Also: RFC 5473 w/ inline errata

Errata ID: 2878
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Paul Aitken
Date Reported: 2011-08-01
Verifier Name: Dan Romascanu
Date Verified: 2011-08-02

Section A.2 says: 

   In this example, using IPFIX to export the measurement data for each
   received packet, 38 bytes have to be transferred (sourceAddressV4=4,
   destinationAddressV4=4, classOfServiceV4=1, protocolIdentifier=1,
   sourceTransportPort=2, destinationTransportPort=2,
   observationTimeMilliseconds=8, digestHashValue=8, ipTotalLength=8).
   Without considering the IPFIX protocol overhead, a Flow of 1000
   packets produces 38000 bytes of measurement data.  Using the proposed
   optimization, each packet produces an export of only 28 bytes
   (observationTimeMilliseconds=8, digestHashValue=8, ipTotalLength=8,
   commonPropertiesID=4).  The export of the Flow information produces
   18 bytes (sourceAddressV4=4, destinationAddressV4=4,
   classOfServiceV4=1, protocolIdentifier=1, sourceTransportPort=2,
   destinationTransportPort=2, commonPropertiesID=4).  For a Flow of
   1000 packets, this sums to 28018 bytes.  This is a decrease of more
   than 26 percent.

It should say:

   In this example, using IPFIX to export the measurement data for each
   received packet, 38 bytes have to be transferred (sourceIPv4Address=4,
   destinationIPv4Address=4, ipClassOfService=1, protocolIdentifier=1,
   sourceTransportPort=2, destinationTransportPort=2,
   observationTimeMilliseconds=8, digestHashValue=8, ipTotalLength=8).
   Without considering the IPFIX protocol overhead, a Flow of 1000
   packets produces 38000 bytes of measurement data.  Using the proposed
   optimization, each packet produces an export of only 28 bytes
   (observationTimeMilliseconds=8, digestHashValue=8, ipTotalLength=8,
   commonPropertiesID=4).  The export of the Flow information produces
   18 bytes (sourceIPv4Address=4, destinationIPv4Address=4,
   ipClassOfService=1, protocolIdentifier=1, sourceTransportPort=2,
   destinationTransportPort=2, commonPropertiesID=4).  For a Flow of
   1000 packets, this sums to 28018 bytes.  This is a decrease of more
   than 26 percent.

Notes:

s/sourceAddressV4/sourceIPv4Address/
s/destinationAddressV4/destinationIPv4Address/
s/classOfServiceV4=1/ipClassOfService/

- twice each.

Names are per IANA's IPFIX registry.

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