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Figure 220 Configuring IGMP snooping in a VLAN
3. Configure the parameters as described in Table 80.
4. Click Apply.
Table 80 Configuration items
Item Descri
VLAN ID This field displays the ID of the VLAN to be configured.
IGMP snooping
Enable or disable IGMP snooping in the VLAN.
You can proceed with the subsequent configurations only if Enable is selected
here.
Version
By configuring an IGMP snooping version, you actually configure the versions of
IGMP messages that IGMP snooping can process.
• IGMPv2 snooping can process IGMPv1 and IGMPv2 messages, but cannot
process IGMPv3 messages, which will be flooded in the VLAN.
• IGMPv3 snooping can process IGMPv1, IGMPv2 and IGMPv3 messages.
IMPORTANT:
If you change IGMPv3 snooping to IGMPv2 snooping, the system clears all IGMP
snooping forwarding entries that are dynamically added.
Drop Unknown
Enable or disable the function of dropping unknown multicast packets.
Unknown multicast data refers 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 received unknown multicast data.
• With the function of dropping unknown multicast data disabled, the switch
floods unknown multicast data in the VLAN to which the unknown multicast
data belongs.
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