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The show process cpu command indicates high CPU utilization in the TTY Background process

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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

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