ZyXEL Communications IES-5005 - Manual (Page 83)

IES-5000/5005/6000 Support Notes
82
IGMP Snooping/IGMP Filtering Application
Without IGMP snooping, multicast traffic is treated in the same manner as broadcast
traffic, that is, it is forwarded to all ports. With IGMP snooping, multicast traffic of a
group is only forwarded to ports that have members of that group. IGMP snooping
generates no additional network traffic, allowing you to significantly reduce multicast
traffic passing through the IP-DSLAM. IGMP filtering allows a port to join specific
IGMP groups. This feature is useful for video service providers as they only need to
allow certain, but not all, channels (or multicast groups) on specific ports.
Video
Server
Internet
ADSL/SHDSL
CPE
Ethernet Port
Video Client
Port 1
IES-5000(ALC/SLC)
IGMP
Router
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