D-Link xStack DGS-3200-10 User Manual page 111

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State
To configure a specific VLAN for MLD Snooping, click the VLAN's corresponding Edit button. The following window appears:
Configure the parameters as described below:
Parameter
VLAN ID
VLAN Name
Query Interval (1-65535 sec)
Max Response Time (1-25
sec)
Robustness Variable (1-255)
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
Used to enable or disable MLD snooping for the specified VLAN. This field is
Disabled by default.
Figure 3 - 38. MLD Snooping Parameters Settings window
Description
This is the VLAN ID that, along with the VLAN Name, identifies the VLAN the user
wishes to modify the MLD Snooping Settings for.
This is the VLAN Name that, along with the VLAN ID, identifies the VLAN the user
wishes to modify the MLD Snooping Settings for.
This parameter is used to specify the amount of time in seconds between general
query transmissions. Default: 125 seconds.
This parameter is used to specify the maximum amount of time in seconds to wait for
reports from listeners. Default: 10 seconds.
This parameter is used to provide fine-tuning that allows for expected packet losses
on a subnet. The value of the robustness variable is used in calculating the following
MLD message intervals:

Group listener interval—Amount of time that must pass before a multicast
router decides there are no more listeners of a group on a network. This
interval is calculated as follows: (robustness variable * query interval) + (1 *
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 *
query interval) + (0.5 * query response interval).

Last listener query count—Number of group-specific queries sent before the
router assumes there are no local listeners 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 lose a high number of packets.
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