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Configuring IGMP snooping
In this chapter, "MSR2000" refers to MSR2003. "MSR3000" collectively refers to MSR3012, MSR3024,
MSR3044, MSR3064. "MSR4000" collectively refers to MSR4060 and MSR4080.
Overview
IGMP snooping runs on a Layer 2 switch as a multicast constraining mechanism to improve multicast
forwarding efficiency. It creates Layer 2 multicast forwarding entries from IGMP packets that are
exchanged between the hosts and the router.
As shown in Figure 10, w
h
en IGMP snooping is not enabled, the Layer 2 switch floods multicast packets
to all hosts. When IGMP snooping is enabled, the Layer 2 switch forwards multicast packets of known
multicast groups to only the receivers.
Figure 10 Multicast packet transmission without and with IGMP snooping
The switch in this document refers to an MSR router installed with Layer 2 Ethernet interface modules.
Basic IGMP snooping concepts
IGMP snooping related ports
As shown in Figure 11, IGMP snooping runs on Switch A and Switch B, and Host A and Host C are
receivers in a multicast group.
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