Implementing IS-IS on Cisco IOS XR Software

How to Implement IS-IS on Cisco IOS XR Software

DETAILED STEPS

 

Command or Action

Purpose

Step 1

 

 

configure

Enters global configuration mode.

 

Example:

 

 

RP/0/RP0/CPU0:router# configure

 

Step 2

 

 

router isis instance-id

Enables IS-IS routing for the specified routing instance, and

 

 

places the router in router configuration mode.

 

Example:

By default, all IS-IS instances are automatically

 

RP/0/RP0/CPU0:router(config)# router isis isp

Level 1 and Level 2. You can change the level of

 

 

routing to be performed by a particular routing instance

 

 

using the is-typerouter configuration command.

Step 3

 

 

net network-entity-title

Configures network entity titles (NETs) for the routing

 

 

instance.

 

Example:

Specify a NET for each routing instance if you are

 

RP/0/RP0/CPU0:router(config-isis)# net

configuring multi-instance IS-IS. You can specify a

 

47.0004.004d.0001.0001.0c11.1110.00

name for a NET and for an address.

 

 

This example configures a router with area ID

 

 

47.0004.004d.0001 and system ID 0001.0c11.1110.00.

 

 

To specify more than one area address, specify

 

 

additional NETs. Although the area address portion of

 

 

the NET differs, the systemID portion of the NET must

 

 

match exactly for all of the configured items.

Step 4

 

 

is-type {level-1 level-1-2 level-2-only}

(Optional) Configures the system type (area or backbone

 

 

router).

 

Example:

By default, every IS-IS instance acts as a level-1-2

 

RP/0/RP0/CPU0:router(config-isis)# is-type

router.

 

level-2-only

The level-1keyword configures the software to perform

 

 

 

 

Level 1 (intra-area) routing only. Only Level 1

 

 

adjacencies are established. The software learns about

 

 

destinations inside its area only. Any packets

 

 

containing destinations outside the area are sent to the

 

 

nearest level-1-2router in the area.

 

 

The level-2-onlykeyword configures the software to

 

 

perform Level 2 (backbone) routing only, and the router

 

 

establishes only Level 2 adjacencies, either with other

 

 

Level 2-only routers or with level-1-2routers.

 

 

The level-1-2keyword configures the software to

 

 

perform both Level 1 and Level 2 routing. Both Level 1

 

 

and Level 2 adjacencies are established. The router acts

 

 

as a border router between the Level 2 backbone and its

 

 

Level 1 area.

 

 

 

Cisco IOS XR Routing Configuration Guide

RC-92

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Cisco Systems IOS XR manual Command or Action Purpose, RC-92

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.