Glossary
697
particularly in ISDN, SMDS, and BISDN. 2) Label of field in an ATM
address containing numbers in E.164 format.
eBGP
External Border Gateway Protocol: Used to exchange route infor-
mation between different autonomous systems.
E channel
Echo channel: A 64Kbps ISDN control channel used for circuit
switching. Specific description of this channel can be found in the 1984 ITU-
T ISDN specification, but was dropped from the 1988 version. See also:
B channel, D channel, and H channel.
edge device
A device that enables packets to be forwarded between legacy
interfaces (such as Ethernet and Token Ring) and ATM interfaces based on
information in the data-link and network layers. An edge device does not take
part in the running of any network layer routing protocol; it merely uses the
route description protocol in order to get the forwarding information required.
EEPROM
electronically erasable programmable read-only memory: Pro-
grammed after their manufacture, these nonvolatile memory chips can be
erased if necessary using electric power and reprogrammed. See also:
EPROM and PROM.
EFCI
Explicit Forward Congestion Indication: A congestion feedback mode
permitted by ABR service in an ATM network. The EFCI may be set by any
network element that is in a state of immediate or certain congestion. The des-
tination end-system is able to carry out a protocol that adjusts and lowers the
cell rate of the connection based on value of the EFCI. See also: ABR.
EIGRP
See: Enhanced IGRP.
EIP
Ethernet Interface Processor: A Cisco 7000 series router interface pro-
cessor card, supplying 10Mbps AUI ports to support Ethernet Version 1 and
Ethernet Version 2 or IEEE 802.3 interfaces with a high-speed data path to
other interface processors.
ELAN
emulated LAN: An ATM network configured using a client/server
model in order to emulate either an Ethernet or Token Ring LAN. Multiple
ELANs can exist at the same time on a single ATM network and are made
up of a LAN emulation client (LEC), a LAN emulation server (LES), a broad-
cast and unknown server (BUS), and a LAN emulation configuration server
(LECS). ELANs are defined by the LANE specification. See also: LANE,
LEC, LECS, and LES.
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