With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsanWwnListWwnIndex
vsan Wwn List Wwn Index
1.3.6.1.4.1.9.9.282.1.2.3.1.2
This is an index to a Port WWN within a Port WWN list.
Back to CISCO-VSAN-MIB MIB page.
IPHost Network monitor allows you to monitor vsanWwnListWwnIndex 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.