Cisco Systems Cisco IOS XR manual Denoted as primary, GL-1

G L O S S A R Y

A

AAA

ACL

authentication, authorization, and accounting. A network security service that provides the primary framework to set up access control on a Cisco CRS-1 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 (for example, to prevent packets with a certain IP address from leaving a particular interface on the router).

active	Denotes a card or process that performs a system task; in a redundant configuration, there is an inactive
	standby card or process available to become active. Active cards or processes are also sometimes
	denoted as primary.

active RP

active software configuration

active software set

algorithm

The RP that is active in a redundant pair of RPs.

The software configuration marked as active for a node.

The set of Cisco IOS XR software packages activated in one or more nodes in a router.

A well-defined rule or process for arriving at a solution to a problem. In networking, algorithms commonly are used to determine the best route for traffic from a particular source to a particular destination.

APS

ASIC

automatic protection switching. A method that allows transmission equipment to recover automatically from failures, such as a cut cable.

application-specific integrated circuit. A chip designed for use in a specific hardware device. An ASIC is a chip designed for a special application, such as a particular kind of transmission protocol.

B

bandwidth

BGP

The amount of data that can be sent in a fixed amount of time. For digital devices, the bandwidth is 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 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.

	Cisco IOS XR Getting Started Guide
OL-10957-02		GL-1