No traffic was detcted on the link for a period longer than 'Time Silent'. Time silent is automatically calculated during Learning mode.
No tarffic was detected on the interface for a period of time greater than the 'Inactive range' that was defined as part of interface configuration.
Multiple changes of the MAC address for a specific IP were detected in a short period of time - this pattern is typical for ARP poisioning attack attempt
A device that wasn't communicating recently and according to the iSID now is defined as inactive- can define in the isid the time frame of no communication in order to get as inactive.
link refers to source and destination and port. a new link will appear when a source and destination that haven't spoken before will speak for the first time
new protocol that was discovered in an existing link (source and destination that already discovered in another protocol)