Netgear FS728TP User Manual Page 152

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FS728TP Smart Switch Software User Manual
5-119 Configuring the Device Using Your Browser
v2.0, November 2006
Configuring Multicast Forwarding
Multicast forwarding allows a single packet to be forwarded to multiple destinations. In L2
Multicast service, an L2 switch receives a single packet addressed to a specific multicast address.
Multicast forwarding creates copies of the packet, and transmits the packets to the relevant ports.
Registered Multicast traffic – If traffic addressed to a registered multicast group is seen it is
handled by an entry in the Multicast Filtering Database and forwarded only to the registered
ports.
Unregistered Multicast traffic – If traffic addressed to an unregistered multicast group is
seen it is handled by a special entry in the Multicast Filtering Database. The default setting of
this is to flood all such traffic (traffic in unregistered multicast groups).
Layer 2 switching forwards multicast packets to all relevant VLAN ports by default, treating the
packet as a multicast transmission. Multicast traffic forwarding is functional. However, irrelevant
ports also receive the multicast, causing increased network traffic. Multicast forwarding filters
enable forwarding of Layer 2 packets to port subsets, defined in the multicast filter database.
The device supports forwarding L2 Multicast Packets. Multicast forwarding is enabled by default,
and not configurable by user.
This section contains the following topics:
Configuring IGMP Snooping
Defining Multicast Groups
Configuring Multicast Forward All
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