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WGS3 Layer 3 Switch User’s Manual
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5.7.4 Configuring IGMP Snooping
This option is displayed on Device Control Menu for Layer 2 mode of WGS3-2620 and on Protocol
Configuration Menu ( under Device Control Menu -> IP Menu) for Layer 3 mode of WGS3-2620 or
WGS3-404. Multicasting is used to support real-time applications such as video conferencing or
streaming audio. A multicast server does not have to establish a separate connection with each client. It
merely broadcasts its service to the network; and any hosts which want to receive the multicast register
with their local multicast switch/router. Although this approach reduces the network overhead required by
a multicast server, the broadcast traffic must be carefully pruned at every multicast switch/router it
passes through to ensure that traffic is only passed on to the hosts which subscribed to this service.
This switch uses IGMP (Internet Group Management Protocol) Snooping to monitor any attached hosts
which want to receive a specific multicast service. It looks up the IP Multicast Group used for this service,
and adds any port which received a similar request to that group.
You can use the IGMP Snooping Configuration screen to configure multicast filtering shown below.