If an MS switch is in use on a given network, the event log can be a handy tool to monitor various switching events.
The event log reports the following switch-specific event types:
Port status changes reflect the physical level of the port. The event log entry will display the new speed of the port vs the old speed or state. A down port reflects there is no link established with the client.
Port STP changes reflect the STP state of the port. If the MS switch is configured to use STP, an entry will appear in the event log whenever a port’s STP status changes. The event log entry will display the old state and the new state, where the possible states are:
SFP module entries are the result in the addition or removal of an SFP Module to the MS switch. The "SFP module inserted" event can also be triggered when the switch reboots and re-discovers the SFP modules.
The following events of this type may occur:
The switch port the module was removed from.