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GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches
Multicast
Multicast IP traffic is traffic that is destined to a host group. Host groups are identified by
class D IP addresses, which range from 224.0.0.0 to 239.255.255.255.
From the Multicast link, you can access the following pages:
• MFDB on page 135
• Auto-Video Configuration on page 137
• IGMP Snooping on page 138
• IGMP Snooping Querier on page 144
• MLD Snooping on page 147
MFDB
The Layer 2 Multicast Forwarding Database (MFDB) is used by the switch to make
forwarding decisions for packets that arrive with a multicast destination MAC address. By
limiting multicasts to only 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, then the packet is either flooded to all ports in the VLAN or discarded, depending on
the switch configuration. If a match is found, then the packet is forwarded only to the ports
that are members of that multicast group.
MFDB Table
The MFDB table holds the port membership information for all active multicast address
entries. Use the MFDB Table page to view the port membership information for all active
multicast address entries. The key for an entry consists of a MAC address. Entries may
contain data for more than one protocol.
To access the MFDB Table page, click Switching
Multicast MFDB MFDB Table.
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