Dell PowerConnect 5524P User Manual page 520

The IGMP Snooping Querier is used to support a Layer 2 Multicast domain
of snooping switches in the absence of a Multicast router, for example, where
Multicast content is provided by a local server, but the router (if one exists)
on that network does not support Multicast.
There should only be a single IGMP Querier in a Layer 2 Multicast domain.
The switch supports standards-based IGMP Querier election when more than
one IGMP Querier is present in the domain.
The speed of IGMP Querier activity should be aligned with the IGMP-
snooping-enabled switches. Queries should be sent at a rate that is aligned to
the snooping table aging time. If queries are sent at a rate lower than the
aging time, the subscriber cannot receive the Multicast packets.
To enable IGMP Snooping on a VLAN:
1 Click Switching Multicast Support IGMP Snooping in the tree view
to display the IGMP Snooping page.
Figure 16-4. IGMP Snooping
The IGMP snooping information for the VLANs on the switch is
displayed.
2 To enable IGMP Snooping on a VLAN, click Edit and select the VLAN
from the VLAN ID drop down menu.
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Dell PowerConnect 55xx Systems User Guide