Implementing IS-IS on Cisco IOS XR Software

How to Implement IS-IS on Cisco IOS XR Software

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Command or Action

Purpose

 

 

nsf interface-expires number

Configures the number of resends of an acknowledged

 

NSF-restart acknowledgment.

Example:

If the resend limit is reached during the NSF restart, the

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

restart falls back to a cold restart.

interface-expires 1

 

 

 

nsf interface-timer seconds

Configures the number of seconds to wait for each restart

 

acknowledgment.

Example:

 

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

 

interface-timer 15

 

 

 

nsf lifetime seconds

Configures the maximum route lifetime following an NSF

 

restart.

Example:

This command should be configured to the length of

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

time required to perform a full NSF restart because it is

20

the amount of time that the Routing Information Base

 

(RIB) retains the routes during the restart.

 

Setting this value too high results in stale routes.

 

Setting this value too low could result in routes purged

 

too soon.

 

 

end

Saves configuration changes.

or

When you issue the end command, the system prompts

 

commit

you to commit changes:

 

Uncommitted changes found, commit them before

Example:

exiting(yes/no/cancel)?

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

[cancel]:

 

or

Entering yes saves configuration changes to the

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

running configuration file, exits the configuration

 

session, and returns the router to EXEC mode.

 

Entering no exits the configuration session and

 

returns the router to EXEC mode without

 

committing the configuration changes.

 

Entering cancel leaves the router in the current

 

configuration session without exiting or

 

committing the configuration changes.

 

Use the commit command to save the configuration

 

changes to the running configuration file and remain

 

within the configuration session.

 

 

show running-config [command]

(Optional) Displays the entire contents of the currently

 

running configuration file or a subset of that file.

Example:

Verify that “nsf” appears in the IS-IS configuration of

RP/0/RP0/CPU0:router# show running-config

the NSF-aware device.

router isis isp

This example shows the contents of the configuration

 

 

file for the “isp” instance only.

 

 

Cisco IOS XR Routing Configuration Guide

RC-107

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Cisco Systems IOS XR manual RC-107

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.