What are the different versions of NetFlow available?

Version 1 is the original format supported in the initial NetFlow releases, while version 5 is the standard and most common NetFlow version deployed. Version 5 is an enhancement that adds Border Gateway Protocol (BGP) autonomous system information and flow sequence numbers. Version 6 is similar to version 7. This version is not used in the new IOS releases. Version 7 is an enhancement that exclusively supports NetFlow with Cisco Catalyst 5000, 6500 and 7600 series switches. Version 8 is an enhancement that adds router-based aggregation schemes. It was introduced to reduce resource usage, and includes a choice of eleven aggregation schemes. Version 9 is an enhancement to support different technologies such as Multicast, Internet Protocol Security (IPSec), and Multi Protocol Label Switching (MPLS ). Versions 2, 3 and 4 either were not released.

Caligare Flow Inspector currently supports NetFlow versions 1,5,6,7 and 9.