With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcIfNxPortAddress
Cisco Fibre Element If Nx Port Address
1.3.6.1.4.1.9.9.289.1.1.5.1.4
The address identifier that has been assigned to the logged-in Nx_Port.
Back to CISCO-FC-FE-MIB MIB page.
IPHost Network monitor allows you to monitor fcIfNxPortAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.