Cisco Terminal Monitor

If you ever connected to a Cisco IOS device using through the console you might have noticed a message like this:

R1#
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to down

As you can probably guess from the output, the message indicates that the link connected to the GigabitEthernet0/0 interface went down. This message was shown to you because the logging console command is enabled by default for the console line. However, SSH and Telnet users will not be shown this message by default. The enable mode command that needs to be executed in order to see these messages is terminal monitor:

R1#terminal monitor

After executing this command the logging messages will also appear on the terminal lines.

NOTE
The command terminal no monitor disables the showing of the log messages. Notice that this is not the standard Cisco syntax – usually the keyword ‘no’ goes in front of the command. We would usually expect the command to be no terminal monitor, but the correct command is actually terminal no monitor.


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