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DES-7200 Configuration Guide Chapter 8 IGMP Snooping
Configuration
8-1
8 IGMP Snooping
Configuration
8.1 Overview
8.1.1 Understanding IGMP Snooping
Internet Group Management Protocol, abbreviated as IGMP Snooping, is an IP
multicast flow mechanism running in the VLAN, and used to manage and control
the IP multicast flow forwarding in the VLAN and belongs to the Layer2 multicast
funtion. The IGMP Snooping function described below is in the VLAN, and the
related ports are the member ports in the VLAN.
The device running IGMP Snooping sets up the mapping for the port and the
multicast address by analyzing the received IGMP packets, and forwards the IP
multicast packets based on the mapping. As shown in the Figure-1, with IGMP
Snooping enabled, the IP multicast packets are broadcasted in the VLAN; while
without IGMP Snooping enabled, the known IP multicast packets are not
broadcasted in the VLAN but sent to the specified recipient.