Command to show interface up or down.

Zoomer

How do I activate verbose logging on a switch/router to show if an interface goes up or down as it happens? I remoted into a test switch and removed/reseated some cables and nothing showed that it went down or up. I thought there was a way to activate this if it was disabled without looking through the logs. Anyone know the ios command?

Netwurk

If you're connected via console, you'll see the interfaces going up or down.

To see this on a remote connection, use the terminal monitor command.

Zartanasaurus

Netwurk wrote: »

If you're connected via console, you'll see the interfaces going up or down.

To see this on a remote connection, use the terminal monitor command.

And to turn this off, contrary to all of your cisco instincts, you use term no mon instead of no term mon.

Netwurk

Zartanasaurus wrote: »

And to turn this off, contrary to all of your cisco instincts, you use term no mon instead of no term mon.

Very cool

I've never had a need to turn off monitoring but you are 100% correct

Could be useful if debug output was causing issues, thanks for the tip

ehnde

I knew about terminal monitor but haven't used it since I was studying for my ccna. Do you think this command would be ok to use on production machines? If I log out of a switch/router without doing "no term mon" would the output be going to whatever vty I was using, causing continuous overhead? Probably a silly question, but I'd rather ask you guys and be sure

Netwurk

Once your telnet or ssh session is over, the terminal monitoring stops.