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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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8-3. NetFlow Data Export

  • Traffic statistics from Layer 3 switching can be gathered and sent to an external application for collection and analysis. This is done through the NetFlow Data Export (NDE) facility.

  • Switches using MLS for Layer 3 switching can send data about expired flows using NDE. This is a natural extension of MLS because the switch uses flow cache data.

  • Switches using CEF do not inherently use a flow cache, and therefore can't offer statistics through NDE. The Catalyst 6000 PFC2/MSFC2, however, keeps a NetFlow cache independent of the CEF process, strictly for exporting flow data with NDE.

  • NetFlow data can be sent as several versions:

    - NDE version 1— Used in legacy systems; data record includes specific information about the IP traffic ...

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