With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnosPortMonitoring
Cisco Network Office Switch Port Monitoring
1.3.6.1.4.1.9.10.43.1.3.1.1.7
Set to enabled(1) to forward receive and transmit frames on this port to the port identified by cnosSysConfigMonitorPort. Set to disabled(2) to not monitor frame traffic on this port.
Back to CISCO-CNO-SWITCH-MIB MIB page.
IPHost Network monitor allows you to monitor cnosPortMonitoring 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.