With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cseFlowMcastResultRtrIp
CISCO SWITCH ENGINE Flow Mcast Result Rtr Ip
1.3.6.1.4.1.9.9.97.1.2.13.1.5
The interface IP address of the router this multicast flow is switching for. Since IP multicast flows can only be established for a router's trunk ports, it is the primary IP address of the router's trunk link that connects to the switch.
Back to CISCO-SWITCH-ENGINE-MIB MIB page.
IPHost Network monitor allows you to monitor cseFlowMcastResultRtrIp 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.