Hello,

By configuring a SPAN port and sniffing all traffic :-)

Seriously, though - a normal switch does not engage in IP communication with the connected stations. It is concerned with their MAC addresses but without any additional requirements, it will not look into the frame contents and try to look for IP addresses (provided it has such functionality because a switch by definition is a Layer2 device).

The DHCP snooping can be used to monitor which stations have request an IP address from DHCP and on which ports they are located. Note, however, that other stations with statically assigned IP addresses will not show in the DHCP snooping database.

There can be other mechanisms to discover the IP addresses of stations connected to a switch and I am would welcome if somebody here will suggest another way to do it but note that a Layer2 switch basically does not have anything to do with IP addresses and you cannot expect it in general to help you discover them.

Best regards,

Peter