It was multicast traffic. After looking to client machine "event viewer in Windows XP", I was 1000 of messages regarding the NIC card and these message started at the same time when the we had the problem. These messages were about the NIC UP, NIC negociating to 100Mbps, NIC negociating 1000, NIC negaciating 10, NIC down, .......
The NIC setting in the machine is auto/auto and the same in the switch "Catalyst 2950" were it is connected to.
How a bad NIC a cause "like" a denial of service, the CPU of our router went to 99%.
IP input is a generic process which handles process switching of packets. Normally, a 6500 should hardware switch all packets and therefore CPU would not go up.
In this case you had high amount of traffic being sent to the CPU for processing and making the processor run high.
We have a good feature called control plane policing which basically allows you to define a service policy to the control plane. This allows you to 'prioritise' and limit traffic coming into the processor and hence stop this happening again.
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.