Nexus 5672UP (7.1) netflow configuration

[Vag]

I have configured netflow as follows:

Nexus(config)# feature netflow

Nexus(config)# flow exporter NFAexporter

Nexus(config-flow-exporter)# destination 192.168.x.x

Nexus(config-flow-exporter)# source Vlan123

Nexus(config-flow-exporter)# transport udp 9996

Nexus(config-flow-exporter)# version 9

Nexus(config)# flow monitor NFAmonitor

Nexus(config-flow-monitor)# exporter NFAexporter

Nexus(config-flow-monitor)# record netflow-original

Nexus(config-flow-monitor)# exit

Nexus(config)#flow timeout 60

Nexus(config)# sampler Sampler

Nexus (config-flow-sampler)#mode 1 out-of 128

and applied it on several interfaces, including SVIs and physical interfaces

Nexus(config)# interface ethernet 2/1

Nexus(config-if)# ip flow monitor NFAmonitor input sampler Sampler

I use ManageEngine NetFlow Analyzer 10 for the flow analysis part and while I do get some traffic data, it seems to be off, showing way lower bandwidth utilization values compared to the real ones.

Any ideas why this is happening?

[Ferzan Unlu · Accepted solution]

Hi Vag,

   Can you check that if your real traffic utilization is 128 times of utilization which manageengine shows?

   That is because of your sampling method.(1 of 128).