D-Link xStack Reference Manual page 105

xStack® DGS-3120 Series Layer 2 Stackable Managed Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
VID
VLAN Name
Rate Limit
Querier IP
Querier Expiry Time
Query Interval
Max Response Time
Robustness Value
Last Member Query
Interval
Data Drive Group Expiry
Time
Querier State
Fast Leave
State
Figure 4-41 IGMP Snooping Parameters Settings window
Description
Specify the name of the VLAN ID.
Specify the name of the VLAN for which IGMP snooping querier is to be configured.
Here is displayed the rate of IGMP control packets that the switch can process on a
specific port/VLAN. The rate is specified in packet per second. The packets that
exceed the limited rate will be dropped.
Displays the querier IP address
Displays the querier expiry time.
Specify the amount of time in seconds between general query transmissions. The
default setting is 125 seconds..
Specify 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 value is used in calculating the following IGMP message intervals: By
default, the robustness variable is set to 2.
Specify the maximum amount of time between group-specific query 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.
Specify the data driven group lifetime in seconds.
Specify to enable or disable the querier state.
Enable or disable the IGMP snooping fast leave function. If enabled, the membership
is immediately removed when the system receive the IGMP leave message.
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
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