Implementing BGP on Cisco IOS XR Software

How to Implement BGP on Cisco IOS XR Software

8.end or commit

DETAILED STEPS

 

Command or Action

Purpose

Step 1

 

 

configure

Enters global configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router# configure

 

Step 2

 

 

router bgp autonomous-system-number

Enters BGP configuration mode allowing you to configure

 

 

the BGP routing process.

 

Example:

 

 

RP/0/RP0/CPU0:router(config)# router bgp 120

 

Step 3

 

 

bgp bestpath med missing-as-worst

Directs the BGP software to consider a missing MED

 

 

attribute in a path as having a value of infinity, making this

 

Example:

path the least desirable path.

 

 

 

RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath

 

 

med missing-as-worst

 

Step 4

 

 

bgp bestpath med always

Configures the BGP speaker in autonomous system 120 to

 

 

compare MEDs among alternative paths, regardless of the

 

Example:

autonomous system from which the paths are received.

 

 

 

RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath

 

 

med always

 

Step 5

 

 

bgp bestpath med confed

Enables BGP software to compare MED values for paths

 

 

learned from confederation peers.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath

 

 

med confed

 

Step 6

 

 

bgp bestpath as-path ignore

Configures the BGP software to ignore the autonomous

 

 

system length when performing best path selection.

 

Example:

 

 

RP/0/RP0/CPU0:router(config-bgp)# bgp bestpath

 

 

as-path ignore

 

 

 

 

Cisco IOS XR Routing Configuration Guide

RC-40

Page 56
Image 56
Cisco Systems IOS XR manual Path the least desirable path, RC-40

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.