HP V1910 Switch Series User Manual page 264

Figure 214 VLAN configuration
Table 101 Items for configuring IGMP snooping in a VLAN
Item
VLAN ID
IGMP Snooping
Version
Drop Unknown
Querier
Query interval
Description
This field displays the ID of the VLAN to be configured.
Enable or disable IGMP snooping in the VLAN.
You can proceed with the subsequent configurations only if Enable is selected here.
By configuring an IGMP snooping version, you actually configure the versions of
IGMP messages that IGMP snooping can process.

IGMP snooping version 2 can process IGMPv1 and IGMPv2 messages, but not
IGMPv3 messages, which will be flooded in the VLAN.

IGMP snooping version 3 can process IGMPv1, IGMPv2, and IGMPv3 messages.
Enable or disable the function of dropping unknown multicast packets.
Unknown multicast data refer to multicast data for which no entries exist in the IGMP
snooping forwarding table.

With the function of dropping unknown multicast data enabled, the switch drops
all the unknown multicast data received.

With the function of dropping unknown multicast data disabled, the switch floods
unknown multicast data in the VLAN to which the unknown multicast data belong.
Enable or disable the IGMP snooping querier function.
On a network without Layer 3 multicast devices, no IGMP querier-related function
can be implemented because a Layer 2 device does not support IGMP. To address
this issue, you can enable IGMP snooping querier on a Layer 2 device so that the
device can generate and maintain multicast forwarding entries at data link layer,
thereby implementing IGMP querier-related functions.
Configure the IGMP query interval.
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