the processing of my perimeter router which is connected to internet, suddenly increases and as I am using voip so this factor effects the voice quality. can u people guide me how to control the processing of the router, even i have denied all the icmp traffic on all the intefaces.
The increase in processing on the router, neednt, be always due to the processes running on the router, It could be that your network is hit by a virus or some programs which keep sending icmp traffic. I have seen situations where the CPU utilisation was at 100 percent, and the reason was a program called Toshiba pinger, which was continuously pinging DNS servers, from a laptop.
What kind of router is it? Are there any errors/drops on any of the interfaces on the router? What process is taking up most of the CPU power? Are you getting a lot of matches on your ACL that is blocking icmp/second? Do you have CEF enabled? When does the router increase to 80 or 90%? Is it always at 80 or 90%? Is it only a high % during high traffic times?
Here's a good URL for troubleshooting high CPU issues:
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