With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsanWwnListEntry
vsan Wwn List Entry
1.3.6.1.4.1.9.9.282.1.2.3.1
This entry contains a Port WWN indexed by a list index and Port WWN index. So each entry is a member of Port WWN list. A list consists of all the entries with the same value of vsanWwnListIndex.
Back to CISCO-VSAN-MIB MIB page.
IPHost Network monitor allows you to monitor vsanWwnListEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.