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3 IGSP
IGMP Snooping (Internet Group Management Protocol Snooping) is a multicast constraint
mechanism on layer 2 switches for managing and controlling multicast groups.
Principle of IGMP snooping
By analyzing IGMP packets, the IGMP-Snooping-enabled layer-2 device will establish a
map of links for ports and multicast MAC addresses, and forward multicast data.
An IGMP-Snooping-disabled layer-2 device will flood multicast traffic to all the ports in a
broadcast domain (or the VLAN equivalent).
With IGMP snooping disabled, known multicast traffic will be broadcast in layer 2.
With IGMP snooping enabled, known multicast traffic wont be broadcast but
multicast to a designated receiver in layer 2. Unknown multicast traffic will still be
broadcast in layer 2.
Multicast packet transmission on this switch with IGMP Snooping enabled/disabled:
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