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This article discusses how user can enable Netflow on the VLAN interface to both layer 2 and 3 traffic.
All NTA versions
To see the traffic arriving on the switch ports that belong to VLAN, you need to enable layer 3 Netflow to display the information on the VLAN interface.
Layer 3 Switched Netflow commands:
|ip flow ingress||Enables Netflow on the layer 3 interface.|
|ip flow ingresslayer2-switched||Enables layer 3 switched Netflow.|
|ip flow ingress infer-fields||Capture the input and output interfaces for logical interfaces.|
For more information on Netflow Layer 3, click here.
Here is a link to a Cisco document that goes through the steps of configuring Netflow on 6500 series switches for both hybrid and native IOS.
The key command to monitor layer 2 is
ip flow ingress layer2-switched vlan xxxx.
The commands for layer2-switched traffic:
|ip flow ingress layer2-switched vlan||vlanlist|
|ip flow export layer2-switched vlan||vlanlist|
|set mls bridged-flow-statistics enable||vlanlist (for CatOS)|
Note: A PFC3B or PFC3BXL running 12.2(18)SXE or higher is required for this command, which enables NDE for all traffic within the specified VLANs rather than just inter-VLAN traffic.
Netflow only summarizes traffic that passes from one VLAN to another (interVLAN) or routed traffic which does not show layer 3 switched traffic. This is due to a disabled Netflow on the VLAN interface.