Implementing BGP on Cisco IOS XR Software

Configuration Examples for Implementing BGP on Cisco IOS XR Software

BGP Neighbor Configuration: Example

The following example shows how BGP neighbors on an autonomous system are configured to share information. In the example, a BGP router is assigned to autonomous system 109, and two networks are listed as originating in the autonomous system. Then the addresses of three remote routers (and their autonomous systems) are listed. The router being configured shares information about networks 131.108.0.0 and 192.31.7.0 with the neighbor routers. The first router listed is in a different autonomous system; the second neighbor and remote-ascommands specify an internal neighbor (with the same autonomous system number) at address 131.108.234.2; and the third neighbor and remote-ascommands specify a neighbor on a different autonomous system.

router bgp 109 network 131.108.0.0 network 192.31.7.0 neighbor 131.108.200.1

remote-as 167 neighbor 131.108.234.2

remote-as 109 neighbor 150.136.64.19

remote-as 99

BGP Confederation: Example

The following is a sample configuration that shows several peers in a confederation. The confederation consists of three internal autonomous systems with autonomous system numbers 6001, 6002, and 6003. To the BGP speakers outside the confederation, the confederation looks like a normal autonomous system with autonomous system number 666 (specified using the bgp confederation identifier command).

In a BGP speaker in autonomous system 6001, the bgp confederation peers command marks the peers from autonomous systems 6002 and 6003 as special eBGP peers. Hence, peers 171.69.232.55 and 171.69.232.56 get the local preference, next hop, and MED unmodified in the updates. The router at

160.69.69.1is a normal eBGP speaker and the updates received by it from this peer are just like a normal eBGP update from a peer in autonomous system 666.

router bgp 6001

bgp confederation identifier 666 bgp confederation peers 6002 6003 neighbor 171.69.232.55 remote-as 6002

neighbor 171.69.232.56 remote-as 6003 neighbor 160.69.69.1 remote-as 777

In a BGP speaker in autonomous system 6002, the peers from autonomous systems 6001 and 6003 are configured as special eBGP peers. Peer 170.70.70.1 is a normal iBGP peer and peer 199.99.99.2 is a normal eBGP peer from autonomous system 700.

router bgp 6002

bgp confederation identifier 666 bgp confederation peers 6001 6003 neighbor 170.70.70.1

remote-as 6002 neighbor 171.69.232.57

remote-as 6001 neighbor 171.69.232.56

remote-as 6003

Cisco IOS XR Routing Configuration Guide

RC-78

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Cisco Systems IOS XR manual BGP Neighbor Configuration Example, BGP Confederation Example, RC-78

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.