Network Management
Example NetFlow Config - Cisco ASR
This is an example of a Cisco ASR configuration for enabling flow export. As your equipment or software versions may vary, we recommend consulting Cisco's knowledge base if you need more information or assistance configuring your device.
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Overview
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Cause
Resolution
The NetFlow infrastructure is based on the configuration and use of the following maps:
• Exporter Map
• Sampler Map
• Flow Monitor Map
Exporter Map:
To configure the Exporter map, you need to define the destination (flow collector), the source interface, the port used for exporting, the version of NetFlow, and the timeout rates.
router(config)# flow exporter-map ORION-EM router(config-fem)# destination 10.1.1.5 router(config-fem)# source gi0/0 router(config-fem)# transport udp 2055 router(config-fem)# version v9 router(config-fem)# template data timeout 60 router(config-fem)# options interface-table timeout 60 router(config-fem)# exit
Sampler Map:
The Sampler map defines the sample rate, default for the ASR series is 10000, no default for the XR 12000, but recommended sample value is 10000 for optimal performance.
router(config)# sampler-map ORION-SM router(config-sm)# random 1 out-of 10000 router(config)# exit
Flow Monitor Map:
The Flow Monitor map defines the cache timeout values and associates the exporter map with this map.
router(config)# flow monitor-map ORION-FMM router(config-fmm)# record ipv4 router(config-fmm)# exporter ORION-EM router(config-fmm)# cache timeout active 60 router(config-fmm)# cache timeout inactive 15 router(config-fmm)# exit
Apply the maps to the interfaces
Now that you have your maps defined, you need to apply the Flow Monitor and Sampler maps to each of your active interfaces:
router(config)# interface Gi0/0 router(config-if)# flow ipv4 monitor ORION-FMM sampler ORION-SM ingress router(config-if)# exit