D-Link DGS-3200 SERIES Cli Manual page 238

DGS-3200 Series Layer 2 Gigabit Managed Switch CLI Manual
query_interval
max_reponse_time
robustness_variable
last_member_query_interval The maximum amount of time between group-specific query
state
version
Specifies the amount of time in seconds between general query
transmissions. the default setting is 125 seconds..
The maximum time in seconds to wait for reports from members. The
default setting is 10 seconds.
Provides fine-tuning to allow for expected packet loss on a subnet. The
value of the robustness variable is used in calculating the following
IGMP message intervals:
‧ Group member interval—Amount of time that must pass before a
multicast router decides there are no more members of a group on a
network. This interval is calculated as follows: (robustness variable x
query interval) + (1 x query response interval).
‧ Other querier present interval—Amount of time that must pass
before a multicast router decides that there is no longer another
multicast router that is the querier. This interval is calculated as follows:
(robustness variable x query interval) + (0.5 x query response interval).
‧ Last member query count—Number of group-specific queries sent
before the router assumes there are no local members of a group. The
default number is the value of the robustness variable.
‧ By default, the robustness variable is set to 2. You might want to
increase this value if you expect a subnet to be lossy.
messages, including those sent in response to leave-group messages.
You might lower this interval to reduce the amount of time it takes a
router to detect the loss of the last member of a group.
If the state is enable, it allows the switch to be selected as a IGMP
Querier (sends IGMP query packets). It the state is disabled, then the
switch can not play the role as a querier. Note that if the Layer 3 router
connected to the switch provides only the IGMP proxy function but
does not provide the multicast routing function, then this state must be
configured as disabled. Otherwise, if the Layer 3 router is not selected
as the querier, it will not send the IGMP query packet. Since it will not
also send the multicast-routing protocol packet, the port will be timed
out as a router port.
Specifies the version of IGMP packet that will be sent by this port. If a
IGMP packet received by the interface has a version higher than the
specified version, this packet will be dropped.
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