Cisco CRS-1 - Carrier Routing System Router Getting Started Manual page 260

Glossary
B
The amount of data that can be sent in a fixed amount of time. For digital devices, the bandwidth is
bandwidth
usually expressed in bits per second (Bps) or bytes per second.
backup designated shelf controller. In case the dSC fails, the backup takes over the role of the dSC.
bdSC
Special Ethernet message sent periodically by the dSC to all other SCs (over the control Ethernet
beacon
connecting all racks).
Switching algorithm used in fabric between stages. In this Benes network, the path that the data takes
Benes
through the network is calculated in a concentrated control circuit from the interconnection between
input ports and output ports.
bit error rate. Ratio of received bits that contain errors.
BER
Border Gateway Protocol. A routing protocol used between autonomous systems. It is the routing
BGP
protocol that makes the internet work. BGP is a distance-vector routing protocol that carries
connectivity information and an additional set of BGP attributes. These attributes allow for a rich set
of policies for deciding the best route to use to reach a given destination.
An alarm that once activated stays active until it is cleared by the process that activated it.
bistate alarm
BOOTstrap protocol. A TCP/IP protocol used by nodes to obtain the IP address, server address, default
BOOTP
gateway, and other network information of a node. The node sends out a BOOTP request in a UDP
packet to the BOOTP server, which returns the required information. The BOOTP request and response
use an IP broadcast function that can send messages before a specific IP address is known.
C
committed access rate. The CAR and DCAR (distributed CAR) services limit the input or output
CAR
transmission rate on an interface or subinterface based on a flexible set of criteria.
The type of the card inserted in a slot.
card type
Cisco Discovery Protocol. CDP runs on all Cisco devices so that these devices can learn about
CDP
neighboring devices and exchange information. CDP uses a well-known multicast MAC address.
During system initialization, the application-specific integrated circuit (ASIC) is configured to forward
these packets to the Cisco IOS software CPU, which processes the packets.
The Cisco website
Cisco.com
Used for matching packets to a specific class.
class map
command-line interface. A text-based user interface to an operating system. A command-line interface
CLI
is a user interface to a computer's operating system or an application in which the user responds to a
visual prompt by typing in a command on a specified line, receives a response back from the system,
and then enters another command, and so forth. Typically, most of today's UNIX-based systems offer
both a command-line interface and a graphical user interface (GUI). See also GUI.
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
GL-2