Discover a non IP element (ex: HUB)

In Network management i want to discover a HUB. How is it possiable if the hub is not a snmp enabled element.

Situation:
A normal HUB is connected to a switch and through that hub 6 Windows and Linux server’s are connected. To get them in Map module i want discover the HUB along with the servers. I am geting the servers but it shows that with one port of the switch 6 servers are connect. This may confuse the operator.

Note: The connected hub is not a snmp enabled ip element.

I hav one more quary. Do all the HUB hav MAC address?

Thanks in advance

Dipyaman Baral