With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsanWwnListIndex
vsan Wwn List Index
1.3.6.1.4.1.9.9.282.1.2.3.1.1
This is an index to a Port WWN list.
Back to CISCO-VSAN-MIB MIB page.
IPHost Network monitor allows you to monitor vsanWwnListIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.