Accton Technology ES4710BD - Manual (Page 252)

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E ES4710BD 10 Slots L2/L3/L4 Chassis Switch
Chapter11 IGMP Snooping Configuration
11.1 Introduction to IGMP Snooping
IGMP (Internet Group Management Protocol) is a protocol used in IP multicast. IGMP is used by
multicast enabled network devices (such as a routers) for host membership query, and by hosts that
are joining a multicast group to inform the router to accept packets of a certain multicast address.
All those operations are done through IGMP message exchange. The router will use a multicast
address (224.0.0.1) that can address to all hosts to send a IGMP host membership query message. If
a host wants to join a multicast group, it will reply to the multicast address of that a multicast group
with a IGMP host membership reports a message.
IGMP Snooping is also referred to as IGMP listening. The switch prevents multicast traffic from
flooding through IGMP Snooping, multicast traffic is forwarded to ports associated to multicast
devices only. The switch listens to the IGMP messages between the multicast router and hosts, and
maintains multicast group forwarding table based on the listening result, and can then decide to
forward multicast packets according to the forwarding table.
ES4710BD provides IGMP Snooping and is able to send a query from the switch so that the user
can use ES4710BD in IP multicast.
11.2 IGMP Snooping Configuration
11.2.1 IGMP Snooping Configuration Task
1. Enable IGMP Snooping
2. Configure IGMP Snooping
3. Configure sending of IGMP Query
1. Enable IGMP Snooping
Command Explanation
Global Mode
ip igmp snooping
no ip igmp snooping
Enables IGMP Snooping
2. Configure IGMP Snooping
Command Explanation
Global Mode