[c-nsp] packet loss

[Yann Gauteron]

Hi Adrian,

I think a complete "show interface fastethernet X/Y" would be useful in
order to consider how many drops are present as compared to the total number
of packets and to get details about these drops !

Then, input drops are quite unusual, as it means that the input buffer was
full at certain period of time. You should understand that (on a router)
your input buffer is filled in by the controller as packets arrive and they
are then unbuffered and handled by the CPU according to the forwarding
scheme chosen (if your router allows CEF, I recommand you to ensure it is
activated).

If your CPU is overloaded, he has not enough time for handling some critical
task, such as handling the input queues...

So regarding your input drops, I would recommend you to first check your CPU
usage and to ensure that your router is not overloaded. If not, you will
have to check if your CPU is not overloaded at certain period of time by
monitoring this value, as well as the input queue drop counter.

We can have more informations about both the input/output drops with a
complete show interface.

If you can also describe the network topology where this router is
installed, it would help us to understand if you are facing a potential
aggregation or speed mismatch problem.

Y.