User manual

Chapter 3: Configuring Switching Information | 47
GS108T and GS110TP Smart Switch Software Administration Manual
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.
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 MAC address. Entries may contain data
for more than one protocol.
To access the MFDB Table page, click Switching Multicast  IGMP Snooping  MFDB
Table.
The following table describes the fields in the MFDB Table.
Field Description
MAC Address The MAC Address to which the multicast MAC address is related.
To search by MAC address, enter the address with the MFDB table entry
you want displayed. Enter six two-digit hexadecimal numbers separated by
colons, for example 00:0f:43:67:89:AB, and then click Go. If the address
exists, that entry will be displayed. An exact match is required.
VLAN ID The VLAN ID to which the multicast MAC address is related.
Component This is the component that is responsible for this entry in the Multicast
Forwarding Database. Possible values are IGMP Snooping or 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.