With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
crcSpanSessionGroup
crc Span Session Group
1.3.6.1.4.1.9.9.103.3.2.12
A collection of objects providing SPAN session information.
Back to CISCO-RMON-CONFIG-MIB MIB page.
IPHost Network monitor allows you to monitor crcSpanSessionGroup on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.