I don't think this -1 will affect your network or will cause any irregularity. It's just that the logs of this GS108T is different from other switches on providing those information. It's nothing to worry about.
Indeed, it doesn't affect the functioning of the network. It does, however, affect the logging and reporting that's used by the engineers that physically maintain the network.
(I've been digging more since I posted this thread)
All other devices (from various manufacturers) return log messages with a space ending the address "10.1.0.1 - message". This then gets resolved properly via DNS and displayed appropriately in the logs. The Netgear switches have the format "10.1.0.1-message" this doesn't get extracted properly leaving a significant percentage of logs displaying "10.1.0.1-" as an addres requiring the engineers to look up the device manually.
This new observation has also prompted me to contact the log processing manufactrer to see if that can refine their address extraction.
Any suggestions greatfully recieved (well...almost any 😉 )
