Flow Monitors - Cisco Nexus 7000 Series Configuration Manual
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Flow Monitors
• Support for IPv6 and Layer 2 fields
If you configure the Version 5 export format, you have these limitations:
• Fixed field specifications
• No support for IPv6 and Layer 2 fields
• The Netflow.InputInterface and Netflow.OutputInterface represent a 16-bit I/O descriptor (IOD) of the
Note
The IOD information of the interface can be retrieved using the show system internal im info global
command.
Cisco NX-OS supports UDP as the transport protocol for exports to up to two collectors.
Note
M1 Series modules support the configuration change from the Version 5 to Version 9 export format, but
Note
F2, F2e, and F3 Series modules do not.
Flow Monitors
A flow monitor references the flow record and flow exporter. You apply a flow monitor to an interface.
Samplers
Cisco NX-OS supports sampled NetFlow. This feature samples incoming and outgoing packets on an interface.
The packets sampled then qualify to create flows.
Sampled NetFlow reduces the amount of export data sent to the collector by limiting the number of packets
that create flows and the number of flows. It is essential when flows are created on a line card or external
device, instead of on the forwarding engine. F2, F2e, F3, and M3 Series modules support only sampled
NetFlow.
Implementing NetFlow on F2 and F2e Series modules creates flows in the software. Too many packets trying
to create or update flows can increase the load on the CPU, thereby increasing the need for a protective rate
limiter. The rate limiter limits the number of packets that reach the CPU to approximately 1000 packets per
second. F3 and M3 Series modules use a special hardware called FSA, which is used as a NetFlow processor,
to create flows.
The sampling mode supported on F2, F2e, F3, M3, M1, and M2 modules is M out of N, where M packets are
selected randomly out of every N packets for sampling, and only those packets can create flows.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
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interface.
Configuring NetFlow
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