%PAGP-5-PORTFROMSTP:Port 3/3 left bridge port 3/3 %PAGP-5-PORTTOSTP:Port 3/3 joined bridge port 3/3
If someone reboots a PC/server/printer it will show that message. Means the switch first lost link on port 3/3 (removing the port from the STP), and then again detected link on the port. Totally normal.
If you see these messages frequently for a particular port, the link is flapping (losing and regaining link constantly), and you should investigate the cause (eg speed/duplex mismatch, bad cable/NIC/port, other misconfiguration).
This is normal. This usually happens when a system connected to a port on the switch is either powering off (leaving the bridge group ) or rebooting (joining the bridge group ). The message is a notification message only, unless the system was not meant to be disconnected it would then required to look into it.
For future reference it is good to note the levels of system messaging, here is a link for reference.
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