Viewing Multicast Forwarding Database Information
D-Link Unified Wired and Wireless Access System
Oct. 2015 Page 238
D-Link UWS User Manual
Viewing Multicast Forwarding Database Information
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
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 VLAN ID and MAC address pair. Entries may contain data for more than one
protocol.
To access the MFDB Table page, click LAN > Monitoring > Multicast Forwarding Database > MFDB Table in
the navigation tree.
Figure 143: MFDB Table
Table 127: MFDB Table Fields
Field Description
MAC Address Enter the VLAN ID/MAC Address pair whose MFDB table entry you want
displayed. Enter eight two-digit hexadecimal numbers separated by colons,
for example 00:01:23:43:45:67:89:AB. The first two 2-digit hexadecimal
numbers are the VLAN ID and the remaining numbers are the MAC address.
Then click on the Search button. If the address exists, that entry will be
displayed. An exact match is required.
MAC Address The multicast MAC address for which you requested data.
Component This is the component that is responsible for this entry in the Multicast
Forwarding Database. Possible values are MLD Snooping, GMRP,IGMP
Snooping, and Static Filtering.
Type This displays the type of the entry. Static entries are those that are configured
by the end user. Dynamic entries are added to the table as a result of a
learning process or protocol.
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