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Configuring Switching Information
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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
Multicast
Multicast IP traffic is traffic that is destined to a host group. The class D addresses identify the
host groups for IPv4 multicast, which range from 224.0.0.0 to 239.255.255.255. The prefix
ff00::/8 identifies the host groups for IPv6 multicast.
From the Multicast menu, you can access features described in the following sections:
MFDB
Auto-Video Configuration
IGMP Snooping
IGMP Snooping Querier
MLD Snooping
Static Multicast Address
MFDB
The switch uses the Layer 2 Multicast Forwarding Database (MFDB) to make forwarding
decisions for packets that arrive with a multicast destination MAC address. By limiting
multicast transmissions only to certain ports in the switch, traffic is prevented from going to
parts of the network where that traffic is unnecessary.
When a packet enters the switch, the destination MAC address is combined with the VLAN
ID, and a search is performed in the Layer 2 Multicast Forwarding Database. If no match is
found, the packet is either flooded to all ports in the VLAN or discarded, depending on the
switch configuration. If a match is found, the packet is forwarded only to the ports that are
members of that multicast group.
Use the MFDB Table to view the port membership information for all active Multicast address
entries. The key for an entry consists of a MAC address. Entries can contain data for more
than one protocol.
From the MFBD link, you can access the following screens:
MFDB Table
MFDB Statistics
MFDB Table
The Multicast Forwarding Database (MFDB) holds the port membership information for all
active multicast address entries.
The key for an entry consists of a VLAN ID and MAC address pair. Entries can contain data
for more than one protocol.
To view the MFDB Table screen:
1. Select Switching Multicast MFDB MFDB Table.
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