Layer 2 Igmp (Snooping And Query) - SMC Networks SMC6724L3 Management Manual

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ONFIGURING THE
Note that IGMP neither alters nor routes IP multicast packets. A multicast
routing protocol must be used to deliver IP multicast packets across
different subnetworks. Therefore, when DVMRP or PIM routing is
enabled for a subnet on this switch, you also need to enable IGMP.

Layer 2 IGMP (Snooping and Query)

IGMP Snooping and Query – If multicast routing is not supported on
other switches in your network, you can use IGMP Snooping and IGMP
Query (page 3-137) to monitor IGMP service requests passing between
multicast clients and servers, and dynamically configure the switch ports
which need to forward multicast traffic.
Static IGMP Router Interface – If IGMP snooping cannot locate the
IGMP querier, you can manually designate a known IGMP querier (i.e., a
multicast router/switch) connected over the network to an interface on
your switch (page 3-140). This interface will then join all the current
multicast groups supported by the attached router/switch to ensure that
multicast traffic is passed to all appropriate interfaces within the switch.
Static IGMP Host Interface – For multicast applications that you need to
control more carefully, you can manually assign a multicast service to
specific interfaces on the switch (page 3-143).
3-136
S
WITCH
L3 - network core
(multicast routing)
L2 - edge switches
(snooping and query)
L2 switch to end nodes
(snooping on IGMP clients)