Cisco CRS-1 - Carrier Routing System Router Getting Started Manual page 11

Preface
This preface explains the objectives, intended audience, and organization of the Cisco CRS-1 Series
Carrier Routing System Getting Started Guide, and provides information on obtaining additional
information on the Cisco CRS-1 Series Carrier Routing System.
Introduction
This document provides an overview of the concepts, technologies, and procedures used to install,
configure, and operate a Cisco CRS-1 Series Carrier Routing System router (Cisco CRS-1 Series router).
A Cisco CRS-1 router can consist of an extensive hierarchy of racks, logical routers, shelves, cards, and
ports. The Cisco CRS-1 router is shipped with one default logical router (LR). An LR is a collection of
line cards, Route Processors, and other assignable or configurable resources, such as interfaces specific
to your network that together form a complete router within the Cisco CRS-1 router system. An LR
contains its own control plane, data plane, and management plane. The Cisco IOS XR command-line
interface (CLI), an enhanced Cisco IOS-like CLI, is the new CLI interface to configure and manage the
Cisco CRS-1 router.
Although the Cisco CRS-1 router is designed to operate as a multiple chassis system that allows for the
Note
configuration of multiple LRs and all their interfaces and resources, Cisco IOS XR Software Releases 2
and 3 support one chassis and one LR. In a single-chassis system, only one LR is necessary or operable.
This chapter contains the following sections:
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About This Document
Cisco CRS-1 Series Carrier Routing System Getting Started Guide provides detailed descriptions of the
hardware and software features of the router, including initial system bring up, configuration
management, software installation, and feature configuration.
About This Document, page xi
Obtaining Documentation, page xiii
Documentation Feedback, page xiv
Obtaining Technical Assistance, page xiv
Obtaining Additional Publications and Information, page xvi
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
xi