Core Issue
A Cisco router may experience this issue when the logging synchronous command is configured under the line con 0 command.
Resolution
The workaround is to remove the logging synchronous command from under the line con 0 command, as shown in this example.
Note: This should be performed only during a scheduled maintenance window. The router could pause indefinitely just after the removal of the command. This could require a manual reboot of the router.
Router(config)#line con 0
Router(config-line)#no logging synchronous
Router(config-line)#
For more information, refer to Troubleshooting High CPU Utilization on Cisco Routers.
Problem Type
Performance issues
Performance Problems
High CPU utilization
