Switching
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XS728T ProSAFE 28-Port 10-Gigabit L2+ Smart Switch
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
unnecessary parts of the network.
When a packet with a destination multicast MAC address is received on the switch, this
address is combined with the VLAN ID, and a search is performed in the Layer 2 MFDB. 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 per the specific VLAN ID.
From the MFBD link, you can access the following screens:
• MFDB Table
• MFDB Statistics
MFDB Table
The 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.
2. In the Search by MAC Address field, enter the MAC address whose MFDB table entry you
want to display.
Enter six 2-digit hexadecimal numbers separated by colons. For example,
01:01:23:43:45:67.
3. Click Go.
If the address exists, that entry is displayed. An exact match is required.
The MFDB Table screen displays the following:
• MAC Address. The multicast MAC address for which you requested data.
• VLAN ID. The VLAN ID to which the multicast MAC address is related.
• Component. The component that is responsible for this entry in the MFDB. Possible
values are IGMP Snooping, Static Filtering, and MLD Snooping.
• Type. The type of the entry. Static entries are configured by the end user. Dynamic
entries are added to the table as a result of a learning process or protocol.
• Description. The text description of this multicast table entry. Possible values are
Management Configured, Network Configured, and Network Assisted.
• Interface. The list of interfaces that are designated for forwarding (Fwd:) and filtering
(Flt:) for the selected address.
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