VLAN-Specific Configuration

IGMP snooping can be enabled on some VLANs or on all VLANs. Each VLAN can be independently configured to be a querier or non-querier and can be configured for IGMPv2 or IGMPv3. In general, the ip multicast commands apply globally to all VLANs except those configured with VLAN-specific multicast commands. The VLAN-specific multicast commands supersede the global ip multicast commands.

IGMP snooping can be configured for IGMPv2 or IGMPv3 on individual ports of a VLAN. An interface or router sends the queries and reports that include its IGMP version specified on it. The version configuration only applies to sending queries. Earlier versions cannot recognize and process later version reports. Later versions can recognize and process both earlier and later versions.

To avoid version deadlock, an interface retains its version configuration even when it receives a report with an earlier version.