Chapter 3 Configuring Additional Router Features

Configuration Limiting

 

Command or Action

Purpose

Step 4

 

 

group group-name

Assigns the user named in Step 2 to a user group.

 

 

The user takes on all attributes of the user group, as

 

Example:

defined by the user group association to various task

 

RP/0/RP0/CPU0:router(config-un)# group sysadmin

groups.

 

 

Each user must be assigned to at least one user group.

 

 

A user may belong to multiple user groups.

 

 

 

Step 5 Repeat Step 4 for each user group to be associated with

 

the user specified in Step 2.

 

Step 6

 

 

end

Saves configuration changes.

 

or

When you issue the end command, the system prompts

 

commit

you to commit changes:

 

Uncommitted changes found. Commit them?

 

 

 

Example:

Entering yes saves configuration changes to the

 

running configuration file, exits the configuration

 

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

 

session, and returns the router to EXEC mode.

 

or

 

 

 

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

Entering no exits the configuration session and

 

returns the router to EXEC mode without

 

 

 

 

committing the configuration changes.

 

 

Use the commit command to save the configuration

 

 

changes to the running configuration file and remain

 

 

within the configuration session.

 

 

 

Related Documents

For more information on configuration and management of users and user access privileges, see the following Cisco documents:

Related Topic

Document Title

 

 

Create users, assign users to user groups, create and

Cisco IOS XR System Security Configuration Guide

modify user groups, and configure remote AAA access

 

 

 

Configuration Limiting

The Cisco IOS XR software places preset limits on the configurations you can apply to the running configuration of a router. These limits ensure that the router has sufficient system resources (such as RAM) for normal operations. Under most conditions, these preset limits are sufficient.

In some cases, for which a large number of configurations is required for a particular feature, it may be necessary to override the preset configuration limits. This override can be done only if configurations for another feature are low or unused. For example, if a router requires a large number of BGP configurations and Multiprotocol Label Switching (MPLS) is not being used at all, then the BGP limits can be increased to use the unused memory assigned to MPLS.

Caution Overriding the default configuration limits can result in a low-memory condition.

Cisco IOS XR Getting Started Guide

3-17

Page 17
Image 17
Cisco Systems IOS XR manual Configuration Limiting, Create users, assign users to user groups, create

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.