Netgear GS728TPP User Manual download pdf (Page 104)

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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.

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Netgear GS728TPP User Manual Page 104