Implementing BGP on Cisco IOS XR Software

Information About Implementing BGP on Cisco IOS XR Software

RP/0/RP0/CPU0:router(config)# router bgp 150

RP/0/RP0/CPU0:router(config-bgp)# session-group AS_2

RP/0/RP0/CPU0:router(config-bgp-sngrp)# advertisement-interval 20

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

RP/0/RP0/CPU0:router(config-bgp)# neighbor-group AS_1

RP/0/RP0/CPU0:router(config-bgp-nbrgrp)# advertisement-interval 15

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

RP/0/RP0/CPU0:router(config-bgp)# neighbor 192.168.1.1

RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as 1

RP/0/RP0/CPU0:router(config-bgp-nbr)# use neighbor-group AS_1

The following output from the show bgp neighbors command shows that the advertisement interval used is 15 seconds:

RP/0/RP0/CPU0:router# show bgp neighbors 192.168.1.1

BGP neighbor is 192.168.2.2, remote AS 1, local AS 140, external link

Remote router ID 0.0.0.0

BGP state = Idle

Last read 00:00:00, hold time is 180, keepalive interval is 60 seconds

Received 0 messages, 0 notifications, 0 in queue

Sent 0 messages, 0 notifications, 0 in queue

Minimum time between advertisement runs is 15 seconds

For Address Family: IPv4 Unicast BGP neighbor version 0

Update group: 0.1

eBGP neighbor with no outbound policy; defaults to 'drop' Route refresh request: received 0, sent 0

Inbound path policy configured

Policy for incoming advertisements is POLICY_1 0 accepted prefixes

Prefix advertised 0, suppressed 0, withdrawn 0, maximum limit 524288 Threshold for warning message 75%

Connections established 0; dropped 0

Last reset 00:01:14, due to BGP neighbor initialized

External BGP neighbor not directly connected.

To illustrate the same rule, the following example shows how to set the advertisement interval to 15 (from the session group). The timers are set to the default (60/180) because the neighbor uses a session group, thus hiding the timers command in the neighbor group. The inbound policy is set to POLICY_1 from the neighbor group.

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

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

RP/0/RP0/CPU0:router(config-bgp-sngrp)# advertisement-interval 15

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

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

RP/0/RP0/CPU0:router(config-bgp-nbrgrp)# timers 10 30

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

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

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

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

RP/0/RP0/CPU0:router(config-bgp)# neighbor 192.168.2.2

RP/0/RP0/CPU0:router(config-bgp-nbr)# remote-as 1

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

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

The following output from the show bgp neighbors command shows that the advertisement interval used is 15 seconds:

Cisco IOS XR Routing Configuration Guide

RC-9

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Cisco Systems IOS XR manual RC-9

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.