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New Member

netflow - packets are not sent

Hello folks,

I have a weird problem:

router 7200 (12.2(33)SRE1) , [ok, it is a bit old, but continue ...]

two interfaces with traffic going through, placed in a Data-VRF

Another physical interface and loopback interface in the global routing-table.

ip flow ingress on all physical interfaces configured

It was running for at least a year: I was getting netflow packets on my analyzer from the box. Since a couple of weeks I get no netflow-packets anymore

debug ip flow export  tells me "IPFLOW: Sending export pak to ... port 2055"

But the packet is not leaving the box. By setting up an ip sla monitor udp-echo I simulated some traffic (udp/2055) which is leaving the box.

Export is in the global routing table:

ip flow-export destination ... 2055

ip flow-export source loopback0

ip flow-export version 9

show ip cache flow shows me the flow entries.

show ip flow export verbose shows me the counters about the flows and sent udp datagrams.

Anyone else having similar problems?


William Boye


netflow - packets are not sent

try to specify the ports...

9991 if i am not wrong:

this is an old IOS but is the example you need


New Member

Re: netflow - packets are not sent

Hello Alessio,

thank you for your posting, but I am sorry that I have to be a bit straight which can sound impolite. But be sure that I do not want to be impolite.

You should not post things which come to your mind, but those things which you can add from your experience or from your knowledge. Of course you can ask questions, if you want to deepen your knowledge.

So both of your hints do not really add something in this regard.

I talked to other colleagues - and so far we have to think about a software bug. The routers where we see these symptoms are up and running for now 2 years and 13 weeks. Netflow was working for a long time with no problems. I doublechecked the environment to see if some firewall or similar device stands in the way.

By setting up the ip sla monitor I was able to see with a "debug ip packet [acl]"  how the packets are leaving the device. The netflow packets are not. On a firewall which lets this kind of traffic pass, I can also see hits when I generate udp/2055-traffic with the ip sla monitor, but I do not see any hits which would be the result of the netflow traffic.

with kind regards, William

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