Is there a way to capture packets getting punted to CPU in NPE-G2?

[Talha Ansari]

While troubleshooting high cpu due to interrupts on platforms like 6500 or 7600 we can capture the packets getting punted to the CPU using netdr or on 4500 I think we can even use monitor session.

But is there a way where we can capture/sniff packets reaching the CPU on a 7206vxr with NPE-G2?

[paolo bevilacqua]

I've got news for you, all and any packet is handled by CPU on the 7200, with all types of NPE.

So whatever standard IOPS capture or debug command will work.

[Talha Ansari]

Is it?? then why ip cef.... is it so that all packets are process switched on npe-g2?

[paolo bevilacqua]

On a software based router like NPE-G2, the CPU processes all packets in IP CEF mode, except the ones destined to itself, and few more special ones.

In other words, there is no process-switching of packets.

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[Talha Ansari]

The interrupts on NPE-G2 indicate that the packets are getting process switched... as per my understanding... correct me if wrong... !

I want to know a way where I can sniff these packets and know the source of the traffic that is reaching the CPU.

[paolo bevilacqua]

Best way to capture traffic is an external device, because other means might interfer with normal router operation.

[Talha Ansari]

But how will I know what packets are getting process switched?