With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cspanSourcesVsanTable
Cisco Switched Port Analyzer Sources Vsan Table
1.3.6.1.4.1.9.9.363.1.1.4
The cspanSourcesVsanTable is used to list source VSANs for SPAN sessions.
Back to CISCO-FC-SPAN-MIB MIB page.
IPHost Network monitor allows you to monitor cspanSourcesVsanTable 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.