I recently joined an organisation and started to monitor the network. I soon found that one of the routers had an average utilization of around 50% and often peaked into the high 90's. To confirm this I checked the router with a sh processes cpu which seemed to confirm the findings and indicated that the IP Input was the biggest cause with 30% utilization.
I would have downloaded the Output Interpreter but I did not have the necessary rights. I've downloaded the document on troubleshooting this problem but was hoping that somebody had already experienced this problem and could give me more direct information.
If you have already turned on CEF and it makes no difference, then its important to find out what traffic this is and then figure out why it is been process switched.
As the doc says use the "show interface stat" and "show interface switching " command to figure out which interface all the traffic is coming in on.
Once you know which interface it is coming in on, issue the "show buffer input-interface header" when the CPU is 90-100%. This will give you a clue which traffic may be coming in and causing the high CPU. If the command doesn't help, sniff the switch port the affected router interface is connected to, when the CPU is 90-100%.
Once you know what the traffic is, and it is unwanted traffic, then you can block it using ACLs.
If the traffic is normal traffic, then try to figure out why the traffic is not been CEF switched.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.