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Glossary
classful routing
Routing protocols that do not send subnet mask informa-
tion when a route update is sent out.
classical IP over ATM
Defined in RFC 1577, the specification for running
IP over ATM that maximizes ATM features. Also known as "CIA."
classless routing
Routing that sends subnet mask information in the
routing updates. Classless routing allows Variable-Length Subnet Mask
(VLSM) and supernetting. Routing protocols that support classless routing
are RIP version 2, EIGRP, and OSPF.
CLI
command-line interface: Allows you to configure Cisco routers and
switches with maximum flexibility.
CLP
Cell Loss Priority: The area in the ATM cell header that determines
the likelihood of a cell being dropped during network congestion. Cells with
CLP
= 0 are considered insured traffic and are not apt to be dropped. Cells
with CLP
= 1 are considered best-effort traffic that may be dropped during
congested episodes, delivering more resources to handle insured traffic.
CLR
Cell Loss Ratio: The ratio of discarded cells to successfully delivered
cells in ATM. CLR can be designated a QoS parameter when establishing a
connection.
CO
central office: The local telephone company office where all loops in a
certain area connect and where circuit switching of subscriber lines occurs.
collapsed backbone
A nondistributed backbone where all network seg-
ments are connected to each other through an internetworking device. A col-
lapsed backbone can be a virtual network segment at work in a device such
as a router, hub, or switch.
collision
The effect of two nodes sending transmissions simultaneously in
Ethernet. When they meet on the physical media, the frames from each node
collide and are damaged. See also: collision domain.
collision domain
The network area in Ethernet over which frames that
have collided will spread. Collisions are propagated by hubs and repeaters,
but not by LAN switches, routers, or bridges. See also: collision.
composite metric
Used with routing protocols, such as IGRP and EIGRP,
that use more than one metric to find the best path to a remote network.
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