NPM could poll for the ARP data, and might be fairly efficient at it, but the pollers would have to cope with possibly large volumes of data.
note: if you have VRFS (we have well over 50) then polling arp data using SNMP will be challenging (and potentially very expensive), depending on which manufacturer you are using, and if it's a full vrf or vrf-lite.
Solarwinds' IPAM product is fairly good at mapping IP<>MAC information, but it does not record the switch ports.
Solarwinds' UDT product is ok at mapping IP<>MAC information, and MAC<>port information.
both products lack an API, and have some fairly big limitations so I'd suggest thoroughly testing them in your environment before purchasing.
If you would like an open-source package then Network Tracking Database | SourceForge.net is an alternative.
