Guidelines And Limitations For Netflow - Cisco Nexus 7000 Series Configuration Manual

Configuring NetFlow
• You must understand the resources required on your device because NetFlow consumes additional
• If you configure VDCs, install the appropriate license and enter the desired VDC. See the Cisco Nexus

Guidelines and Limitations for NetFlow

NetFlow has the following configuration guidelines and limitations:
• You must configure a source interface for the NDE export. If you do not configure a source interface,
• You must configure a valid record name for every flow monitor.
• All of the NetFlow timeouts, except the flow timeout, are applicable only to M1 and M2 Series modules.
• A rollback will fail if you try to modify a record that is programmed in the hardware during a rollback.
• Only Layer 2 NetFlow is applied on Layer 2 interfaces, and only Layer 3 NetFlow is applied on Layer
• If you add a member to a port channel that is already configured for Layer 2 NetFlow, its NetFlow
• If you change a Layer 2 interface to a Layer 3 interface, the software removes the Layer 2 NetFlow
• Use NetFlow v9 export to see the full 32-bit SNMP ifIndex values at the NetFlow connector.
• The maximum number of supported NetFlow entries is 512,000.
• On tunnel interface, NetFlow is not supported, even though its configurable.
• The Cisco Nexus 2000 Series Fabric Extender (FEX) supports a Layer 3 NetFlow configuration on FEX
• The Cisco Nexus 2000 Series FEX supports bridged NetFlow (for flows within a VLAN).
• M1 Series modules support the configuration change from the Version 5 to Version 9 export format,
• F2, F2e, F3, and M3 Series modules do not support the following changes:
• Beginning with Cisco NX-OS Release 5.2, NetFlow is supported on switch virtual interfaces (SVIs) for
• For M Series modules, if you apply a Layer 3 NetFlow input flow monitor to an SVI and apply a Layer
memory and CPU resources.
7000 Series NX-OS Virtual Device Context Configuration Guide for configuration information and the
Cisco NX-OS Licensing Guide for licensing information.
the flow exporter will remain in a disabled state.
The flow timeout is supported only for F2, F2e, and F3 Series modules. Only active and inactive timeouts
are applicable for M3 Series modules.
3 interfaces.
configuration is removed and the Layer 2 configuration of the port channel is added to it.
configuration from the interface.
ports.
but F2, F2e, and F3 Series modules do not.
◦ Changing the fields in a record that is applied on the active monitor.
◦ Changing the sampling mode value on a sampler that is applied on the active monitor.
F1 Series ports, if at least one M1 Series module is present. SVI NetFlow is for traffic that is routed
between VLANs.
2 NetFlow input flow monitor to a Layer 2 interface such as a trunk that allows the same underlying
VLAN, all input flows into both interfaces are reported by the Layer 2 NetFlow flow monitor only.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
Guidelines and Limitations for NetFlow
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