Implementing BGP on Cisco IOS XR Software

Information About Implementing BGP on Cisco IOS XR Software

The following example displays sample output from the show bgp neighbors command using the inheritance keyword. The example shows that the neighbor inherits session parameters from neighbor group GROUP_1, which in turn inherits from session group GROUP_2. The neighbor inherits IPv4 unicast parameters from address family group GROUP_3 and IPv4 multicast parameters from neighbor group GROUP_1:

RP/0/RP0/CPU0:router# show bgp neighbors 192.168.0.1 inheritance

Session:

n:GROUP_1

s:GROUP_2

IPv4

Unicast:

a:GROUP_3

 

IPv4

Multicast: n:GROUP_1

 

The following example displays sample output from the show bgp neighbors command using the configuration keyword. The example shows from where each item of configuration was inherited, or if it was configured directly on the neighbor (indicated by [ ]). For example, the ebgp-multihop 3 command was inherited from neighbor group GROUP_1 and the next-hop-selfcommand was inherited from the address family group GROUP_3:

RP/0/RP0/CPU0:router# show bgp neighbors 192.168.0.1 configuration

neighbor 192.168.0.1

 

 

remote-as 2

 

[]

advertisement-interval 15

 

[n:GROUP_1 s:GROUP_2]

ebgp-multihop 3

 

[n:GROUP_1]

address-family ipv4 unicast

[]

next-hop-self

 

[a:GROUP_3]

route-policy POLICY_1

in

[a:GROUP_3]

weight 200

 

[]

address-family ipv4 multicast

[n:GROUP_1]

default-originate

 

[n:GROUP_1]

show bgp af-group

Use the show bgp af-groupcommand to display address family groups:

Use the configuration keyword to display the effective configuration for the address family group, including any settings that have been inherited from address family groups used by this address family group.

Use the inheritance keyword to display the address family groups from which this address family group is capable of inheriting configuration.

Use the users keyword to display the neighbors, neighbor groups, and address family groups that inherit configuration from this address family group.

The show bgp af-groupcommand examples that follow are based on the this sample configuration:

RP/0/RP0/CPU0:router(config)# router bgp 140

RP/0/RP0/CPU0:router(config-bgp)#af-group GROUP_3 address-family ipv4 unicast

RP/0/RP0/CPU0:router(config-bgp-afgrp)# remove-private-as

RP/0/RP0/CPU0:router(config-bgp-afgrp)# route-policy POLICY_1 in

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

RP/0/RP0/CPU0:router(config-bgp)#af-group GROUP_1 address-family ipv4 unicast

RP/0/RP0/CPU0:router(config-bgp-afgrp)# use af-group GROUP_2

RP/0/RP0/CPU0:router(config-bgp-afgrp)# maximum-prefix 2500 75 warning-only

RP/0/RP0/CPU0:router(config-bgp-afgrp)# default-originate

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

RP/0/RP0/CPU0:router(config-bgp)#af-group GROUP_2 address-family ipv4 unicast

RP/0/RP0/CPU0:router(config-bgp-afgrp)# use af-group GROUP_3

RP/0/RP0/CPU0:router(config-bgp-afgrp)# send-community-ebgp

RP/0/RP0/CPU0:router(config-bgp-afgrp)# send-extended-community-ebgp

RP/0/RP0/CPU0:router(config-bgp-afgrp)# capability orf prefix-list both

Cisco IOS XR Routing Configuration Guide

RC-12

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Cisco Systems IOS XR manual Show bgp af-group, RC-12

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.