It depends how you have syslog configured. I believe with a factory config, interface down events do show up in the messages log.
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Nikolay Semov
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Original Message:
Sent: 08-01-2024 14:51
From: JOHN MUNOZ
Subject: Interface Event Logs?
Which log file would contain records of interface UP/DOWN/ALARM conditions? We've been trying to track down an issue at a remote site and noticed that one of the interface was down with active LINK alarms.
With the link down we were not getting syslog messages but curious if there is an internal log that might better show a history of the UP/DOWN events.