Dell PowerEdge VRTX - Manual (Page 352)

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FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Plasma\User
Guide\Plasma_UGSwitching_Multicast.fm
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IGMP Snooping
IGMP Snooping can be enabled globally, as described in the Global
Parameters page. It can also be enabled per VLAN to support selective IPv4
Multicast forwarding. In this case, Bridge Multicast filtering must also be
enabled.
By default, a Layer 2 switch forwards Multicast frames to all ports of the
relevant VLAN, essentially treating the frame as if it were a Broadcast. When
IGMP Snooping is enabled per VLAN, the switch forwards Multicast frames
to ports that have registered as Multicast clients in the VLAN.
NOTE: The switch supports IGMP Snooping only on static VLANs. It does not
support IGMP Snooping on dynamic VLANs.
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.
Filtering: Enabled
VLAN: Forward-All
Port Static Status
------- ----------------- -----------
gi0/3 Forbidden Filter
gi0/4 Forward Forward(s)
gi0/5 - Forward(d)