D-Link DES-2108 User Manual page 41

'RouterPortPurgeInterval' time, the learnt router port entry will be
purged. Default is 125 seconds.
Leave Time (0-25 sec): This is the interval after which a Leave
message is forwarded on a port. When a leave message from a host
for a group is received, a group-specific query is sent to the port on
which the leave message is received. A timer is started with a time
interval equal to IgsLeaveProcessInterval. If a report message is
received before the timer expires, the Leave message is dropped.
Otherwise the Leave message is forwarded to the port. Default is 1
second.
To enable IGMP snooping for a given VLAN, select Enable and click
on the Apply button. Then press the Edit button under Router Port
Setting, and select the ports to be assigned for IGMP snooping for the
VLAN, and press Apply for changes to take effect.
Figure 28. Configuration > IGMP Router Port Settings
To view the Multicast Entry Table for a given VLAN, press the View
button
Figure 29. Configuration > IGMP Multicast Entry Table
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