How To Configure Netflow - Cisco Nexus 5600 Series Configuration Manual

How to Configure NetFlow

• If you configure both NetFlow and SPAN on the same interface then only the SPAN configuration is
• You must configure a valid record name for every flow monitor.
• The maximum number of supported NetFlow entries is 512,000.
• We recommend that you configure NetFlow on a maximum of 500 destination nodes. Each interface
• You cannot change the fields in a record that is applied on the monitor
• You cannot change the sampling mode value on a sampler that is applied on the monitor
• If NetFlow is configured on both SVI and a VLAN then only the routed packets are updated on the SVI
• NetFlow can cause high CPU loads, to prevent issues with the control plane the following limitations
• Ingress layer 2 NetFlow is supported on the following types of interfaces:
• Ingress layer 3 NetFlow is supported on the following types of interfaces:
• Ingress bridged NetFlow is supported on VLANs.
How to Configure NetFlow
To configure NetFlow on a switch you perform the following steps:
• Define a flow record by specifying key and non-key fields of interest.
• Define one or many flow exporters by specifying export format, protocol, destination and other parameters.
• Define a flow monitor based on the above flow record and flow exporter(s).
• Apply the flow monitor to an interface with a sampling method specified.
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applied and the NetFlow configuration is ignored.
and module on which a particular VLAN is active is counted for the NetFlow scale. An example of a
NetFlow scale scenario is as follows
• If ingress SVI is configured on a VLAN that is active on 3 interfaces in a single module, the
NetFlow scale is 3.
NetFlow.
apply:
• NetFlow can be configured in the Ingress direction only
• NetFlow packets that reach the CPU are not policed by the ASIC
◦ Layer 2 switch interface/port channel
◦ FEX interface
◦ Layer 3 interface/port channel
◦ Layer 3 sub-interface/port channel sub-interface
◦ SVI
Configuring NetFlow
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