How to configure logging on Cisco IOS

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Overview

Device logs often offer valuable information when troubleshooting a network issue. Interface status, security alerts, environmental conditions, CPU process hog, and many other events on the router or switch can be captured and analyzed later by studying the logs. By default, all log messages on a Cisco router or switch are sent to the console port. Only users that are physically connected to the console port may view these messages. If you are connected to a Cisco device via Telnet or SSH and want to see console messages, you can enter the command terminal monitor in privileged exec mode. Cisco devices support five types of logging:

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