Moxa-technologies Moxa EtherDevice Switch EDS-508 Manual do Utilizador descarregar pdf (Página 57)

EDS-508 Series User’s Manual Featured Functions

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publisher/subscriber communications models by multicasting packets that could flood a network

with heavy traffic. IGMP Snooping provides the ability to prune multicast traffic so that it travels

only to those end destinations that require the traffic, thus reducing the amount of traffic on the

Ethernet LAN.

Multicast Filtering

Multicast filtering is the process that ensures that end-stations only receive multicast traffic if they

multicast traffic to the ports that are connected to registered end-stations. The following figure

shows how a network behaves without multicast filtering, and with multicast filtering.

The Network without multicast filtering

IGMP Group 1 IGMP Group 1IGMP Group 2 IGMP Group 2

Group 1 Multicast Stream Group 2 Multicast Stream

All end-stations must handle the traffic whether they need it or not.

The Network with multicast filtering

IGMP Group 1 IGMP Group 1IGMP Group 2 IGMP Group 2

Group 1 Multicast Stream Group 2 Multicast Stream

End-stations only receive dedicated traffic belonging to the same group.

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Moxa-technologies Moxa EtherDevice Switch EDS-508 Manual do Utilizador Página 57