G L O S S A Ry - Cisco XR 12000 Series Getting Started Manual

A
authentication, authorization, and accounting. A network security service that provides the primary
AAA
framework to set up access control on a Cisco CRS router or access server. AAA is an architectural
framework and modular means of configuring three independent but closely related security functions
in a consistent manner.
access control list. A list kept by routers to control access to or from the router for a number of services
ACL
(for example, to prevent packets with a certain IP address from leaving a particular interface on the
router).
Denotes a card or process that performs a system task; in a redundant configuration, there is an inactive
active
standby card or process available to become active. Active cards or processes are also sometimes
denoted as primary.
The RP that is active in a redundant pair of RPs.
active RP
The software configuration marked as active for a node.
active software
configuration
The set of Cisco IOS XR software packages activated in one or more nodes in a router.
active software set
A well-defined rule or process for arriving at a solution to a problem. In networking, algorithms
algorithm
commonly are used to determine the best route for traffic from a particular source to a particular
destination.
automatic protection switching. A method that allows transmission equipment to recover automatically
APS
from failures, such as a cut cable.
application-specific integrated circuit. A chip designed for use in a specific hardware device. An ASIC
ASIC
is a chip designed for a special application, such as a particular kind of transmission protocol.
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.
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.
OL-24755-01
Cisco IOS XR Getting Started Guide for the Cisco XR 12000 Series Router

G L O S S A RY

GL-143