With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
crcSpanUsedSession
crc Span Used Session
1.3.6.1.4.1.9.9.103.1.6.1.1.4
The number of sessions currently used for the SPAN capacity session type defined.
Back to CISCO-RMON-CONFIG-MIB MIB page.
IPHost Network monitor allows you to monitor crcSpanUsedSession on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.