Chapter 3 Configuring Additional Router Features

Managing Configuration History and Rollback

Tip To preview the commands that undo the configuration during a rollback, use the show configuration rollback changes command.

To roll back to the last x commits made, enter the rollback configuration last x command; x is a number ranging from 1 to the number of saved commits in the commit database.

In the following example, a request is made to roll back the configuration changes made during the previous two commits:

RP/0/RP0/CPU0:router# rollback configuration last 2

Loading

Rollback Changes.

 

Loaded Rollback Changes in

1 sec

Committing.

 

1 items

committed in 1 sec

(0)items/sec

Updating.

 

Updated

Commit database in

1 sec

Configuration successfully

rolled back 2 commits.

Loading the Configuration Changes for a Specific CommitID

You can load the configuration changes recorded by any commitID by entering the load commit changes command in global configuration mode. The load commit changes command must be followed by a commitID number, as shown in the following example:

RP/0/0/CPU0:router(config)# load commit changes 1000000066 Building configuration...

Loading.

21 bytes parsed in 1 sec (20)bytes/sec

The configuration changes are added to the target configuration and are not applied until you enter the commit command.

Tip To display the target configuration, enter the show configuration command.

Loading Rollback Configuration Changes to the Target Configuration

You can load rollback configuration changes to the target configuration by entering the load rollback changes command in global configuration mode. This command is similar to the rollback configuration command. The difference between the commands is that the load rollback changes command copies the rollback changes to the target configuration and does not commit the changes.

Tip To display the rollback changes, enter the show configuration rollback changes command.

Cisco IOS XR Getting Started Guide

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Cisco Systems IOS XR manual Loading the Configuration Changes for a Specific CommitID

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.