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Chapter 7 IGMP Snooping
Configuration
7.1 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 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 an 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 an 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 decides multicast packet forwarding according to the forwarding table.
ES4626/ES4650 provides IGMP Snooping and is able to send a query from the switch so
that the user can use ES4626/ES4650 in IP multicast.
7.2 IGMP Snooping Configuration
7.2.1 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
Enable IGMP Snooping