NETGEAR GS716T Software Administration Manual page 115

GS716Tv2 and GS724Tv3 Software Administration Manual
Field
Description
Interface
Use the buttons at the bottom of the page to perform the following actions:
• Click Clear to clear one or all of the IGMP Snooping entries.
• Click Refresh to reload the page and display the most current information.
Multicast Forwarding Database Table
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.
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  IGMP Snooping  MFDB
Table.
The following table describes the fields in the MFDB Table.
Description
The text description of this multicast table entry. Possible values are
Management Configured, Network Configured, and Network Assisted.
The list of interfaces that are designated for forwarding (Fwd) and filtering
(Flt) for the associated address.
Chapter 3: Configuring Switching Information | 115