Flow Exporters - Cisco Nexus 7000 Series Configuration Manual
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Also See for Nexus 7000 Series:
- Command reference manual (1018 pages) ,
- Reference manual (746 pages) ,
- Configuration manual (536 pages)
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Configuring NetFlow
• match flow direction
Flow Exporters
A flow exporter contains network layer and transport layer details for the NetFlow export packet. You can
configure the following information in a flow exporter:
• Export destination IP address
• Source interface
• UDP port number (where the collector is listening for NetFlow packets)
NetFlow export packets use the IP address that is assigned to the source interface. If the source interface
Note
does not have an IP address assigned to it, the flow exporter will be inactive.
Cisco NX-OS exports data to the collector whenever a timeout occurs or when the flow is terminated (TCP
FIN or RST received, for example). You can configure the following timers to force a flow export:
• Active timeout—Removes the cache entries from the cache. Prevents long-lasting flows from becoming
• Inactive timeout—Removes the cache entries from the cache. Inactive timeout is supported on the M1,
• Fast timeout—Flushes low-hitting flows for the M1 and M2 Series modules.
• Aggressive timeout—Aggressively times out the flows when the cache starts getting full for the M1 and
• Session timeout—Ages the flows if the TCP close connection handshake is observed (FIN/FIN_ACK
• Flush cache timeout—Flushes the cache for F2, F2e, and F3 Series modules.
The first five timeouts are applicable only to the NetFlow cache on M Series modules. The flow timeout
Note
is supported only for F2, F2e, and F3 Series modules.
The active and inactive timeouts exist by default and cannot be unconfigured. Only their time values can be
configured.
Export Formats
Cisco NX-OS supports the Version 5 and Version 9 export formats. We recommend that you use the Version
9 export format for the following reasons:
• More efficient network utilization
invisible to the collector for a long period of time. The value of the active timeout should always be
greater than that of the inactive timeout. Active timeout is supported on the M1, M2, F3 and M3 Series
modules.
M2, F3 and M3 Series modules.
M2 Series modules.
packets). Session timeout is supported on M1 and M2 Series modules.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
Flow Exporters
369
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