D-Link DGS-3308FG Product Manual - Page 99

IGMP Snooping screen

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8-port Gigabit Ethernet Switch User's Guide Figure 6-36. IGMP Snooping screen To edit a VLAN's IGMP Snooping Settings: • Switch IGMP Snooping:< > - This field can be toggled between Enabled and Disabled using the space bar. This enables or disables IGMP snooping for the selected VLAN. • Querier State:< > - This field determines whether the Switch is able to send IGMP snooping queries. • Non-Querier - This indicates the IGMP interface will never try to become a querier in the VLAN. • V1-Querier - If there is no querier present in the VLAN or the interface's IP address is smaller than the current querier-whether V1-Querier or V2-Querier-the IGMP interface will become the querier for the VLAN. An IGMPv1 query packet is sent in this mode. IGMPv2 Group Specific Query and leave packets are not handled. • V2-Querier - In this mode, if there is one V1-Querier present in the VLAN, the IGMP interface will keep silent. If there is no querier present in the VLAN or the interface's IP address is smaller than the current V2Querier, the IGMP interface will become the querier for the VLAN. When receiving an IGMPv2 leave packet, the IGMP interface will issue an IGMPv2 Group Specific Query packet immediately and wait one second to see if any IGMP report is received on the Ethernet port. If not, the Ethernet port will be removed from the IGMP group member list and the group's multicast data will not be forwarded to this port until an IGMP report is received again. • Robustness Variable - A numeric value between 2 and 255 that allows tuning for expected packet losses on a subnet. If a subnet is expected to have high packet losses, the robustness variable maybe increased. The default is 2. • Query Interval - The time in seconds between transmission of IGMP packets. • Max Response - Sets the maximum amount of time allowed before sending an IGMP response report value between 1 and 20 seconds can be entered, with a default of 10 seconds. Robustness Variable, Query Interval, and Max Response values are combined to produce an IGMP age-out timer value between 10 and 9,999 seconds. This timer determines how long a snooped multicast member's IP and MAC 89

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8-port Gigabit Ethernet Switch User’s Guide
89
Figure 6-36.
IGMP Snooping screen
To edit a VLAN’s IGMP Snooping Settings:
•
Switch IGMP Snooping:<
>
– This field can be toggled between
Enabled
and
Disabled
using the space bar.
This enables or disables IGMP snooping for the selected VLAN.
•
Querier
State:<
>
–
This field determines whether the Switch is able to send IGMP snooping queries.
•
Non-Querier
– This indicates the IGMP interface will never try to become a querier in the VLAN.
•
V1-Querier
– If there is no querier present in the VLAN or the interface’s IP address is smaller than the
current querier—whether
V1-Querier
or
V2-Querier—
the IGMP interface will become the querier for the
VLAN. An IGMPv1 query packet is sent in this mode. IGMPv2 Group Specific Query and leave packets are
not handled.
•
V2-Querier
–
In this mode, if there is one V1-Querier present in the VLAN, the IGMP interface will keep
silent. If there is no querier present in the VLAN or the interface’s IP address is smaller than the current V2-
Querier, the IGMP interface will become the querier for the VLAN. When receiving an IGMPv2 leave packet,
the IGMP interface will issue an IGMPv2 Group Specific Query packet immediately and wait one second to
see if any IGMP report is received on the Ethernet port. If not, the Ethernet port will be removed from the
IGMP group member list and the group’s multicast data will not be forwarded to this port until an IGMP
report is received again.
•
Robustness Variable
–
A numeric value between
2
and
255
that allows tuning for expected packet losses on a
subnet. If a subnet is expected to have high packet losses, the robustness variable maybe increased. The default is
2
.
•
Query Interval
– The time in seconds between transmission of IGMP packets.
•
Max Response
–
Sets the maximum amount of time allowed before sending an IGMP response report value
between
1
and
20
seconds can be entered, with a default of
10
seconds.
Robustness Variable
,
Query Interval
, and
Max Response
values are combined to produce an IGMP age-out
timer value between 10 and 9,999 seconds. This timer determines how long a snooped multicast member’s IP and MAC