Device Became Inactive
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.
New Protocol Detected
new protocol that was discovered in an existing link (source and destination that already discovered in another protocol)
New Link Detected
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