C O N T E N T S

Preface xi

 

 

 

 

 

 

 

 

Document Revision History

xi

 

 

 

 

Obtaining Documentation

xii

 

 

 

 

Cisco.com

xii

 

 

 

 

 

 

 

Product Documentation DVD

xii

 

 

 

Ordering Documentation

xii

 

 

 

Documentation Feedback

xiii

 

 

 

 

Cisco Product Security Overview

xiii

 

 

 

Reporting Security Problems in Cisco Products

xiii

 

Obtaining Technical Assistance

xiv

 

 

 

Cisco Technical Support & Documentation Website xiv

 

Submitting a Service Request

xv

 

 

 

Definitions of Service Request Severity

xv

 

 

Obtaining Additional Publications and Information

xv

 

Implementing BGP on Cisco IOS XR Software

RC-1

 

Contents RC-1

 

 

 

 

 

 

 

 

Prerequisites for Implementing BGP on Cisco IOS XR Software

RC-2

Information About Implementing BGP on Cisco IOS XR Software

RC-2

BGP Functional Overview

RC-2

 

 

 

BGP Router Identifier

RC-3

 

 

 

 

BGP Default Limits

RC-3

 

 

 

 

BGP Validation of Local Next-Hop Addresses

RC-4

 

BGP Configuration

RC-4

 

 

 

 

No Default Address Family

RC-15

 

 

 

Routing Policy Enforcement

RC-16

 

 

 

Table Policy

RC-18

 

 

 

 

 

 

Update Groups

RC-18

 

 

 

 

 

BGP Best Path Algorithm

RC-18

 

 

 

Multiprotocol BGP

RC-21

 

 

 

 

Route Dampening

RC-23

 

 

 

 

BGP Routing Domain Confederation RC-24

 

 

BGP Route Reflectors

RC-24

 

 

 

 

Default Address Family for show Commands

RC-27

 

Cisco IOS XR Routing Configuration Guide

RC-iii

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Cisco Systems IOS XR manual N T E N T S

IOS XR specifications

Cisco Systems IOS XR is an advanced operating system designed specifically for high-performance routers and service provider networks. It serves as the backbone for many of Cisco's high-end routing platforms, enabling service providers to manage their networks with increased efficiency, flexibility, and scalability.

One of the main features of IOS XR is its modular architecture. This allows for the independent operation of various components within the OS, facilitating the deployment of new features and updates without affecting the overall stability of the system. This modularity ensures that service providers can implement rapid changes and enhancements while maintaining service continuity.

Another characteristic of IOS XR is its support for 64-bit architecture, which provides enhanced performance and the ability to manage larger amounts of data. This is particularly beneficial for service providers that deal with high traffic volumes and require robust data processing capabilities. The utilization of 64-bit technology also enables the operating system to utilize memory more efficiently, allowing for greater scalability.

IOS XR incorporates advanced technologies such as Distributed System Architecture (DSA) and Multiple Routing Instances (Merging Routes). DSA allows for the distribution of routing processes across multiple hardware resources, maximizing performance and redundancy. Multiple Routing Instances enable operators to create separate logical routing tables for different services, improving isolation and efficiency in managing network traffic.

The operating system also focuses heavily on security, featuring extensive encryption methods and access controls to safeguard network resources. IOS XR supports various authentication protocols, ensuring secure access to routers and switches. In addition, the OS includes comprehensive logging and monitoring capabilities, allowing network administrators to track activities and respond quickly to potential threats.

Another critical aspect of IOS XR is its adherence to the principles of service-oriented architecture (SOA). This approach permits the development of applications and services that can operate independently, fostering innovation and enabling service providers to tailor their offerings based on customer demands.

Ultimately, Cisco IOS XR is a powerful, reliable operating system that meets the complex needs of modern telecommunications networks. With its focus on modularity, performance, security, and scalability, it enables service providers to deliver high-quality, resilient services to their customers while efficiently managing network resources. As the industry continues to evolve, IOS XR remains a vital tool for those aiming to stay competitive in the ever-changing landscape of networking.