NetFlow Versions
| Version | Comment |
|---|---|
| v1 | First implementation, now obsolete, and restricted to IPv4 (without IP mask and AS Numbers). |
| v2 | Cisco internal version, never released. |
| v3 | Cisco internal version, never released. |
| v4 | Cisco internal version, never released. |
| v5 | Most common version, available (as of 2009) on many routers from different brands, but restricted to IPv4 flows. |
| v6 | No longer supported by Cisco. Encapsulation information (?). |
| v7 | Like version 5 with a source router field. Used (only?) on Cisco Catalyst switches. |
| v8 | Several aggregation form, but only for information that is already present in version 5 records |
| v9 | Template Based, available (as of 2009) on some recent routers. Mostly used to report flows like IPv6, MPLS, or even plain IPv4 with BGP nexthop. |
| v10 | aka IPFIX, IETF Standardized NetFlow 9 with several extensions like Enterprise-defined fields types, and variable length fields. |
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“The assumption must be that those who can see value only in tradition, or versions of it, deny man’s ability to adapt to changing circumstances.”
—Stephen Bayley (b. 1951)