D-Link DES-1228P - Manual (Page 49)

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Max Response Time (10-25 sec): The Max Response Time specifies
the maximum allowed time before sending a responding report.
Adjusting this setting effects the "leave latency", or the time between
the moment the last host leaves a group and when the routing protocol
is notified that there are no more members. It also allows adjustments
for controlling the frequency of IGMP traffic on a subnet. Default is
10 seconds.
Robustness Variable (1-255 sec): The Robustness Variable allows
adjustment for the expected packet loss on a subnet. If a subnet is
expected to be lossy, the Robustness Variable may be increased. The
Robustness Variable can not be set zero, and SHOULD NOT be one.
Default is 2 seconds.
Last Member Query Interval (1-25 sec): The Last Member Query
Interval is the Max Response Time inserted into Group-Specific
Queries sent in response to Leave Group messages, and is also the
amount of time between Group-Specific Query messages. This value
may be adjusted to modify the "leave latency" of the network. A
reduced value results in reduced time to detect the loss of the last
member of a group. Default is 1 second.
Host Timeout (130-1225 sec): This is the interval after which a learnt
host port entry will be purged. For each host port learnt, a
'PortPurgeTimer' runs for 'HostPortPurgeInterval'. This timer will be
restarted whenever a report message from host is received over that
port. If no report messages are received for 'HostPortPurgeInterval'
time, the learnt host entry will be purged from the multicast group.
Default is 260 seconds.
Router Timeout (60-600 sec): This is the interval after which a learnt
router port entry will be purged. For each router port learnt, a
'RouterPortPurgeTimer' runs for 'RouterPortPurgeInterval'. This timer
will be restarted whenever a router control message is received over
that port. If no router control messages are received for