Implementing IS-IS on Cisco IOS XR Software

How to Implement IS-IS on Cisco IOS XR Software

Configuring Nonstop Forwarding for IS-IS

This task explains how to configure your router with NSF that allows the Cisco IOS XR software to resynchronize the IS-IS link-state database with its IS-IS neighbors after a process restart. The process restart could be due to an:

RP failover (for a warm restart)

Simple process restart (due to an IS-IS reload or other administrative request to restart the process)

IS-IS software upgrade

In all cases, NSF mitigates link flaps and loss of user sessions. This task is optional.

SUMMARY STEPS

1.configure

2.router isis instance-id

3.nsf {cisco ietf}

4.nsf interface-expires number

5.nsf interface-timer seconds

6.nsf lifetime seconds

7.end or commit

8.show running-config [command]

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:

You can change the level of routing to be performed by

 

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

a particular routing instance using the is-typerouter

 

 

configuration command.

Step 3

 

 

nsf {cisco ietf}

Enables NSF on the next restart.

 

 

Enter the cisco keyword to run IS-IS in heterogeneous

 

Example:

networks that might not have adjacent NSF-aware

 

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

networking devices.

 

 

Enter the ietf keyword to enable IS-IS in homogeneous

 

 

networks where all adjacent networking devices

 

 

support IETF draft-based restartability.

 

 

 

Cisco IOS XR Routing Configuration Guide

RC-106

Page 122
Image 122
Cisco Systems IOS XR manual Configuring Nonstop Forwarding for IS-IS, RC-106

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.