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High CPU utilization on a router

Core Issue

Following are the symptoms you may face during high CPU utilization in routers :

  • The router is being overloaded with traffic or the traffic not taking the optimal switching path through the router. The issue is also caused by the Blaster and Nachi worms.
  • Router not responding to ping, Input queue drops and not able to telnet.

Resolution

For general troubleshooting of high CPU utilization on Cisco routers, refer to How to resolve high CPU utilization on routers   To determine if your problem is related to Blaster or Nachi worms, refer to these documents:

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