Implementing Routing Policy on Cisco IOS XR Software

Information About Implementing Routing Policy

Table 3

BGP Attributes and Operators

 

 

 

 

 

Attribute

 

Match

Set

 

 

 

 

as-path

 

in

prepend

 

 

is-local

 

 

 

length

 

 

 

neighbor-is

 

 

 

originates-from

 

 

 

passes-though

 

 

 

unique-length

 

 

 

 

 

community

 

is-empty

delete

 

 

matches-any

set

 

 

matches-every

 

 

 

 

 

dampening

 

n/a

set dampening... to set

 

 

 

values that control the

 

 

 

dampening (see

 

 

 

Dampening, page RC-225)

 

 

 

 

destination

 

in

n/a

 

 

 

extended community

is-empty

delete

 

 

matches-any

set

 

 

matches-every

 

 

 

 

local-preference

n/a

set

 

 

 

 

med

 

is, eq, ge, le

set

 

 

 

set +

 

 

 

set -

 

 

 

 

next-hop

 

in

set

 

 

 

 

origin

 

is

set

 

 

 

rib-has-route

in

n/a

 

 

 

 

route-type

 

is

n/a

 

 

 

 

source

 

in

n/a

 

 

 

suppress-route

n/a

suppress-route

 

 

 

 

tag

 

is, eq, ge, le

set

 

 

 

traffic-index

n/a

set

 

 

 

unsuppress-route

n/a

unsuppress-route

 

 

 

 

weight

 

n/a

set

 

 

 

 

Some BGP route attributes are inaccessible from some BGP attach points for various reasons. For example, the set med igp-cost only command makes sense when there is a configured igp-cost to provide a source value. Table 4 summarizes which operations are valid and where they are valid.

Cisco IOS XR Routing Configuration Guide

RC-230

Page 246
Image 246
Cisco Systems IOS XR manual Attribute Match Set, RC-230

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.