With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsanIndex
vsan Index
1.3.6.1.4.1.9.9.282.1.1.3.1.1
The ID of the VSAN.
Back to CISCO-VSAN-MIB MIB page.
IPHost Network monitor allows you to monitor vsanIndex 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.