Viewing Multicast Forwarding Database Information; Mfdb Table; Figure 162: Mfdb Table - D-Link DWS-4026 User Manual

Software User Manual
12/10/09
Field
Load Balance
V M
IEWING ULTICAST
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.
This Multicast Support folder contains links to the following pages:
•

"MFDB Table"

• "MFDB GMRP Table"
• "MFDB IGMP Snooping Table"
• "MFDB Statistics"
MFDB T
ABLE
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.
Document 34CSFP6XXUWS-SWUM100-D7
Table 144: Port Channel Status Fields (Cont.)
Description
Shows the hashing algorithm used to distribute the traffic load among available
physical ports in the LAG. The range of possible values may vary with the type of
switch. The possible values are:
• Source MAC, VLAN, EtherType, and source port
• Destination MAC, VLAN, EtherType and source port
• Source/Destination MAC, VLAN, EtherType, and source port
• Source IP and Source TCP/UDP Port
• Destination IP and Destination TCP/UDP Port
• Source/Destination IP and source/destination TCP/UDP Port
F D
ORWARDING

Figure 162: MFDB Table

D-Link Unified Access System
I
ATABASE NFORMATION

Viewing Multicast Forwarding Database Information

Page 241