I received an alert from one of my routers for high CPU utilization. The router responded to ping, so it was still active. I tried to telnet to the router, but the attempt timed out. After about 10-20 minutes, I managed to access the router. I did a 'show process memory' and 'show process cpu'. I did not notice any process high compared to my baseline. The 'show process cpu history' did vouch that the router experienced high CPU.
Anyone suggest how I go about trying to find out what caused the spike? Monitoring tools, other commands, etc.?