Tsunami QB-8100 Series (100 Mbps/5 Mbps Models) Installation and Management Guide 119
4.10 IGMP Snooping (Bridge Mode only)
The Internet Group Management Protocol (IGMP) is a communication protocol used to manage the membership of
Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent multicast routers to establish multicast group
memberships.
Internet Group Management Protocol (IGMP) Snooping is the process of listening to IGMP network traffic. It is a feature
that allows a layer 2 switch to “listen in” on the IGMP conversation between hosts and routers by processing the layer 3
IGMP packets sent in a multicast network.
4.10.0.1 Types of IGMP Snooping:
There are two types of IGMP Snooping.
Active IGMP Snooping:
Active IGMP Snooping listens to IGMP traffic and filters IGMP packets to reduce load on the multicast router. Joins and leaves
heading upstream to the router are filtered so that only the minimal quantity of information is sent.
Passive IGMP Snooping:
Passive IGMP Snooping simply listens to IGMP traffic and does not filter or interfere with IGMP.
Figure 4-63 IGMP Snooping Process
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