With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swL2IGMPLeaveTimer
Switch L2 IGMP Leave Timer
1.3.6.1.4.1.171.11.70.5.2.11.3.1.8
When a querier receives a Leave Group message for a group that has group members on the reception interface, it sends Group-Specific Queries every swL2IGMPLeaveTimer to the group being left.
Back to DES3528-L2MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor swL2IGMPLeaveTimer 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 access points right now.