Sir, I am not sure about it. I have 2 units of USG300, one is on "live production settings" and the other one is in the stock room, I read about device HA and i wonder how am i going to connect the 2 units and configure the said functionality.
Actually all the ports of the master USG300 from ge1 to ge7 are occupied and populated as follows:
ge1 - LAN ge2 - connected to a cisco router going to all our branches ge3 - ISP (Internet) ge4 - IPVPN link to a 3rd party network ge5 - web server ge6 - free ge7 - IT Dept
This is why i don't what port to use and connect it to the spare unit..