forwarding
database
The switch maintains a
database of all MAC address received on all of its ports and uses this information to decide
whether a frame should be forwarded or filtered. Each FDB entry consists of the MAC address
of the sending device, an identifier for the port on which the frame was received, and an
identifier for the
VLAN (Virtual LAN) to which the device belongs. Frames
destined for devices that are not currently in the FDB are flooded to all members of the
VLAN. For some types of entries, you configure the time it takes for the specific entry to
age out of the FDB.