IES-5000 Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
29
Setting up the IGMP Snooping/IGMP Filtering
Without IGMP snooping multicast traffic is treated in the same manner as broadcast
traffic, that is, it is forwarded to all port. 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 is for allowing a port to join
some specific IGMP groups. This can be applied in Video service providers. They can
only open some specific channels (groups) to specific ports.
ADSL/SHDSL
CPE
Video
Server
Internet
Ethernet Port
Video Client
Port 1
IGMP
Router
IES-5000(ALC/SLC)