With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cIpMRouteRtMask
Cisco Ip Multicast Route Rt Mask
1.3.6.1.4.1.9.10.117.1.1.2.1.15
The mask associated with the route used to find the upstream or parent interface for this multicast forwarding entry.
Back to CISCO-IETF-IPMROUTE-MIB MIB page.
IPHost Network monitor allows you to monitor cIpMRouteRtMask on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.
