Implementing BGP on Cisco IOS XR Software

Information About Implementing BGP on Cisco IOS XR Software

RP/0/RP0/CPU0:router# show bgp session-group GROUP_1 configuration

session-group GROUP_1

 

ebgp-multihop 2

[s:GROUP_2]

update-source Loopback0

[]

dmz-link-bandwidth

[s:GROUP_2 s:GROUP_3]

The following is sample output from the show bgp session-groupcommand with the inheritance keyword showing that the GROUP_1 session group inherits session parameters from the GROUP_3 and GROUP_2 session groups:

RP/0/RP0/CPU0:router# show bgp session-group GROUP_1 inheritance

Session: s:GROUP_2 s:GROUP_3

The following is sample output from the show bgp session-groupcommand with the users keyword showing that both the GROUP_1 and GROUP_2 session groups inherit session parameters from the GROUP_3 session group:

RP/0/RP0/CPU0:router# show bgp session-group GROUP_3 users

Session: s:GROUP_1 s:GROUP_2

show bgp neighbor-group

Use the show bgp neighbor-groupcommand to display neighbor groups:

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

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

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

The examples are based on the following group 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)# soft-reconfiguration inbound

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

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

RP/0/RP0/CPU0:router(config-bgp)# session-group GROUP_3

RP/0/RP0/CPU0:router(config-bgp-sngrp)# timers 30 90

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

RP/0/RP0/CPU0:router(config-bgp)# neighbor-group GROUP_1

RP/0/RP0/CPU0:router(config-bgp-nbrgrp)# remote-as 1982

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

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

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

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

RP/0/RP0/CPU0:router(config-bgp)# neighbor-group GROUP_2

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

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

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

RP/0/RP0/CPU0:router(config-bgp-nbrgrp-af)# weight 100

Cisco IOS XR Routing Configuration Guide

RC-14

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Cisco Systems IOS XR manual Show bgp neighbor-group, RC-14

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.