Extreme Networks ExtremeWare XOS Guide Manual page 652

Glossary
E (Continued)
Ethernet
extended mode
F
Fast Convergence
FDB
FIB
frame
full-duplex
G
GBIC
Gigabit Ethernet
ExtremeWare XOS 11.3 Concepts Guide
This is the IEEE 802.3 networking standard that uses carrier sense
multiple access with collision detection (CSMA/CD). An Ethernet
device that wants to transmit first checks the channel for a carrier, and
if no carrier is sensed within a period of time, the device transmits. If
two devices transmit simultaneously, a collision occurs. This collision
is detected by all transmitting devices, which subsequently delay their
retransmissions for a random period. Ethernet runs at speeds from 10
Mbps to 10 Gbps on full duplex.
ESRP extended mode supports and is compatible only with switches
running ExtremeWare XOS software exclusively.
In EAPS, Fast Convergence allows convergence in less than 50
milliseconds. You configure this parameter for the entire switch, not
by EAPS domain.
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 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.
Forwarding Information Base. On the BlackDiamond 8800 family of
switches and the Summit X450 switch, the Layer 3 routing table is
referred to as the FIB.
This is the unit of transmission at the data link layer. The frame
contains the header and trailer information required by the physical
medium of transmission.
This is the communication mode in which a device simultaneously
sends and receives over the same link, doubling the bandwidth. Thus,
a full-duplex 100 Mbps connection has a bandwidth of 200 Mbps, and
so forth. A device either automatically adjusts its duplex mode to
match that of a connecting device or you can configure the duplex
mode; all devices at 1 Gbps or higher run only in full-duplex mode.
Gigabit Interface Connector. These devices, available in a variety of
fiber modes and physical shapes, provide the physical interface to a
gigabit Ethernet connection.
This is the networking standard for transmitting data at 1000 Mbps or
1 Gbps. Devices can transmit at multiples of gigabit Ethernet as well.
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