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I have encountered the following problem with a 3600 (config below) Freezing and not passing any taffic. this has happend on anumber of occasions. I have shortened the access list which is slightly longer.
That is because of high cpu on a router. We need to see which process is hogging the cpu of the router. So for that you need to plug the console on a router and leave it and hopefully router will exhibit some indication (like tracebacks) about process spiking the cpu.
Also try to moniter the box using "sh proc cpu" and see what process is spiking it when cpu goes near 90 to 99%.
When you issue "sh proc cpu" you need to see the first line where it reports the cpu usage in general with 1, 5 min avg etc. If that is beyond 80% for 5 min average, its a problem so after that you need to start seeing the processee which is hogging it.
Here is the url for troubleshooting high cpu on a router.
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