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Netflow on Nexus 7000

Hello team, hope that you’re doing great.

I configured NTA 3.5 and Network Performance Monitor V9.5. Everything looks great but the problem that I have is that I configured my Nexus 7000 with version 9 and the console (NTA) is receiving the next output: Netflow Receiver Service [NETFLOW] encountered an invalid V9 template with ID 256 from device 10.63.33.254

Can anyone please help me :S

Thanks in advanced.

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nexus

Accepted answers

billsardine

The correct config for a 7k is as follows

flow exporter FLOW_NAME
destination 10.32.7.254 use-vrf management
transport udp 2055
source mgmt0
version 9
template data timeout 90
flow monitor FLOW_NAME
record netflow-original
exporter FLOW_NAME

if you use the record netflow-original command you dont have to create a flow record

All comments

mcbridea

Hi Pablo,

That is the default template ID so it should be OK. Do you see flows from that device and get the error in the event log or do you only get the error and no data.

Andy

Pablo.Ayala

Andy thanks for your quick response.

The problem that I have is that in the main window of the NTA I never get the flows. There is some part of this window that says: Netflow Sources and over there I have the VDC of the Nexus and under the LAST NETFLOW RECEIVED label says NEVER so I'm not receiving anything. The configure of the Nexus is:

configure terminal
feature netflow
!
flow record ElektraIPv4Flow
description IPv4Flow
match ip protocol
collect counter bytes
collect counter packets
exit
!
flow exporter ElektraExportV9
description Exportv9
destination 10.63.33.56
source vlan 630
version 9
transport udp 9995
exit
!
flow monitor ElektraMonitorV9
description IPv4Monitor
exporter ElektraExportV9
record ElektraIPv4Flow
exit
!
interface vlan 630
ip flow monitor ElektraMonitorV9 input
ip flow monitor ElektraMonitorV9 output

If I show the Nexus outputs we will see flows to the Collector.

Thanks again

mcbridea

I see. That template is a flexible NetFlow implementation and won't work unless you also match

ip source, ip destination, tos, input interface, destination port, source port.

The default template for v9 includes these but I'm not sure how that is implemented for the 7K. For other platforms you just don't specify a template or any match/collect parameters.

billsardine

The correct config for a 7k is as follows

flow exporter FLOW_NAME
destination 10.32.7.254 use-vrf management
transport udp 2055
source mgmt0
version 9
template data timeout 90
flow monitor FLOW_NAME
record netflow-original
exporter FLOW_NAME

if you use the record netflow-original command you dont have to create a flow record

bsoth

I know this post is from February, but wondering about contexts and vlans in the 7k. we have several.

If I configure

flow exporter FLOW_NAME
destination 10.32.7.254 use-vrf management
transport udp 2055
source mgmt0
version 9
template data timeout 90
flow monitor FLOW_NAME
record netflow-original
exporter FLOW_NAME

If I dont create a flow record, will this basically capture everything or is this per context?

Im new to the 7k and Netflow so maybe Im asking an obvious question...