Viewing Multicast Forwarding Database Information; Multicast Forwarding Database Summary - Ubiquiti EdgeSwitch ES-24-250W Administration Manual

EdgeSwitch Administration Guide
™

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, 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.

Multicast Forwarding Database Summary

Use the Multicast Forwarding Database Summary 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 Multicast Forwarding Database Summary page, click Switching > Multicast Forwarding
Database > Summary in the navigation menu.
Field Description
VLAN ID The VLAN ID associated with the entry in the MFDB.
MAC Address The multicast MAC address that has been added to the MFDB.
Component The feature on the device that was responsible for adding the entry to the multicast forwarding database,
which is one of the following:
• IGMP Snooping
multicast groups by listening to IGMP join and leave requests.
• MLD Snooping
multicast groups by listening to MLD join and leave requests.
• GMRP
control the flooding of multicast traffic by keeping track of group membership information.
• Static Filtering
Type The type of entry, which is one of the following:
• Static
• Dynamic
Description A text description of this multicast table entry.
Interface(s) The list of interfaces that will forward or filter traffic sent to the multicast MAC address.
Forwarding Interface(s) The list of forwarding interfaces. The list does not include any interfaces listed as static filtering interfaces.
To quickly find a MAC address when the list is too long to scan, enter the MAC address in the Filter box.
Click Refresh to update the information on the screen with the most current data.
Ubiquiti Networks, Inc.
Multicast Forwarding Database Summary
Multicast Forwarding Database Summary Fields
A Layer-2 feature that allows the device to dynamically add or remove ports from IPv4
A Layer-2 feature that allows the device to dynamically add or remove ports from IPv6
Generic Address Resolution Protocol (GARP) Multicast Registration Protocol, which helps help
A static MAC filter that was manually added to the address table by an administrator.
The entry has been manually added to the MFDB by an administrator.
The entry has been added to the MFDB as a result of a learning process or protocol.
Configuring Switching Information
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