With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
agentPortMirrorMode
agent Port Mirror Mode
1.3.6.1.4.1.14179.1.2.12.1.20
The switch's Port Mirror Mode. If enabled, then this is the port that the packets are mirrored to.
Back to AIRESPACE-SWITCHING-MIB MIB page.
IPHost Network monitor allows you to monitor agentPortMirrorMode 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.