Router Functionality?

Router Functionality?

Does anyone know what the "Routers" are used for in OpUtils? I know what a router is and how it works ..... just how does OpUtils utilize this device?
Maybe the better question is:
What information exactly does OpUtils get from a configured "Router"? Please be very detailed .....
 
The underlying reason is that I am trying to find out where OpUtils gets its infromation for IP<>MAC assignments because I am missing many of them. I would assume it gets this information from the ARP table in the Switches but I havent confirmed that. I have many IP's used but no MAC address information about them .....

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