D-Link DES-3326SR Manual page 158

The following fields can be set for IGMP Interfaces:
Parameter
Interface Name <System>
IP Address
Version <2>
Query Interval <125>
Max Response Time <10>
Robustness Variable <2>
D-Link DES-3326SR Layer 3 Switch
NOTE: The Robustness Variable field allows IGMP to be 'tuned' for sub-
networks that are expected to lose many packets. A high value (max. 255)
for the robustness variable will help compensate for 'lossy' sub-networks.
A low value (min. 2) should be used for less 'lossy' sub-networks.
Description
Displays the name of the IP interface that is to be configured for
IGMP. This must be a previously configured IP interface.
Displays the IP address corresponding to the IP interface name
above.
Enter the IGMP version (1 or 2) that will be used to interpret IGMP
queries on the interface.
Allows the entry of a value between 1 and 65535 seconds, with a
default of 125 seconds. This specifies the length of time between
sending IGMP queries.
Sets the maximum amount of time allowed before sending an IGMP
response report. A value between 1 and 25 seconds can be entered,
with a default of 10 seconds.
A tuning variable to allow for subnetworks that are expected to lose a
large number of packets. A value between 2 and 255 can be entered,
with larger values being specified for subnetworks that are expected
to lose larger numbers of packets.
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