With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
crcSpanMaxSession
crc Span Max Session
1.3.6.1.4.1.9.9.103.1.6.1.1.3
The maximum number of sessions allowed for the SPAN type defined by crcSpanCapacityType. A value of zero indicates no specific limit for this SPAN capacity session type.
Back to CISCO-RMON-CONFIG-MIB MIB page.
IPHost Network monitor allows you to monitor crcSpanMaxSession 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.