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 af-groupcommand using the configuration keyword. This example shows from where each configuration item was inherited. The default-originatecommand was configured directly on this address family group (indicated by [ ]). The remove-private-ascommand was inherited from address family group GROUP_2, which in turn inherited from address family group GROUP_3:

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

af-group GROUP_1

address-family ipv4 unicast

 

 

capability orf

prefix-list both

[a:GROUP_2]

default-originate

[]

 

maximum-prefix

2500 75 warning-only

[]

 

route-policy POLICY_1 in

[a:GROUP_2

a:GROUP_3]

remove-private-AS

[a:GROUP_2

a:GROUP_3]

send-community-ebgp

[a:GROUP_2]

send-extended-community-ebgp

[a:GROUP_2]

The following example displays sample output from the show bgp af-groupcommand using the users keyword:

RP/0/RP0/CPU0:router# show bgp af-group GROUP_2 users

IPv4 Unicast: a:GROUP_1

The following example displays sample output from the show bgp af-groupcommand using the inheritance keyword. This shows that the specified address family group GROUP_1 directly uses the GROUP_2 address family group, which in turn uses the GROUP_3 address family group:

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

IPv4 Unicast: a:GROUP_2 a:GROUP_3

show bgp session-group

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

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

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

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

The examples that follow sample output from the show bgp session-groupcommand with the configuration keyword in EXEC mode. The examples are based on the following session group configuration:

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

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

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

RP/0/RP0/CPU0:router(config-bgp-sngrp)# update-source Loopback 0

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

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

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

RP/0/RP0/CPU0:router(config-bgp-sngrp)# ebgp-multihop 2

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

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

RP/0/RP0/CPU0:router(config-bgp-sngrp)# dmz-link-bandwidth

The following is sample output from the show bgp session-groupcommand with the configuration keyword in EXEC mode:

Cisco IOS XR Routing Configuration Guide

RC-13

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Cisco Systems IOS XR manual Show bgp session-group, RC-13

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.