With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swPimIpMRouteAssertRPTBit
Switch Pim Ip M Route Assert RPT Bit
1.3.6.1.4.1.171.12.52.3.7.1.7
The value of the RPT-bit advertised by the assert winner on the upstream interface, or false if no such assert is in effect.
Back to PIM-SM-MIB MIB page.
IPHost Network monitor allows you to monitor swPimIpMRouteAssertRPTBit on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link VPN routers right now.