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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.
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 Switching > Forwarding Database > MFDB Table in the navigation menu.
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. |
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. |
Description |
The text description of this multicast table entry. Possible values are Management Configured, Network Configured and Network Assisted. |
Interface(s) |
The list of interfaces that are designated for forwarding (Fwd) and filtering (Flt) for the selected address. |
Forwarding Interface(s) |
The resultant forwarding list is derived from combining all the forwarding interfaces and removing the interfaces that are listed as the static filtering interfaces. |
Use the GMRP Table page to view all of the entries in the Multicast Forwarding Database that were created for the GARP Multicast Registration Protocol.
To access the GMRP Table page, click Switching > Multicast Forwarding Database > GMRP Table in the navigation menu.
GMRP Table Fields
Field |
Description |
|---|---|
MAC Address |
A VLAN ID/multicast MAC address pair for which the switch has forwarding and or filtering information. The format is 8 two-digit hexadecimal numbers that are separated by colons. |
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. |
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 associated address. |
Click Refresh to update the information on the screen with the most current data.
Use the IGMP Snooping Table page to view all of the entries in the Multicast Forwarding Database that were created for IGMP snooping. To access the IGMP Snooping Table page, click Switching > Multicast Forwarding Database > IGMP Snooping Table in the navigation menu.
MFDB IGMP Snooping Table Fields
Field |
Description |
|---|---|
MAC Address |
A VLAN ID/multicast MAC address pair for which the switch has forwarding and or filtering information. The format is 8 two‐digit hexadecimal numbers that are separated by colons. |
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. |
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 associated address. |
Use the MLD Snooping Table page to view all of the entries in the Multicast Forwarding Database that were created for MLD Snooping.
To access the MLD Snooping Table page, click Switching > Multicast Forwarding Database > MLD Snooping Table in the navigation menu.
MLD Snooping Table Fields
Field |
Description |
|---|---|
MAC Address |
A VLAN ID/multicast MAC address pair for which the switch has forwarding and or filtering information. The format is 8 two-digit hexadecimal numbers that are separated by colons. |
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. |
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 associated address. |
Use the multicast forwarding database Stats page to view statistical information about the MFDB table.
To access the Stats page, click Switching > Multicast Forwarding Database > Stats in the navigation menu.
Multicast Forwarding Database Statistics Fields
Field |
Description |
|---|---|
Max MFDB Entries |
Shows the maximum number of entries that the Multicast Forwarding Database table can hold. |
Most MFDB Entries Since Last Reset |
The largest number of entries that have been present in the Multicast Forwarding Database table since the system was last reset. This value is also known as the MFDB high-water mark. |
Current Entries |
Shows the current number of entries in the Multicast Forwarding Database table. |
Click Refresh to update the information on the screen with the most current data.