Cisco Systems IOS XR manual Rolling Back the Configuration to a Specific Rollback Point

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Chapter 3 Configuring Additional Router Features

Managing Configuration History and Rollback

To display the prospective rollback configuration changes from the current configuration to a specific session, enter the show configuration rollback changes to commitId command:

RP/0/RP0/CPU0:router# show configuration rollback changes to 1000000373

Building configuration...

interface Loopback2 no description

no ipv4 address 10.0.0.1 255.0.0.0

To display the prospective rollback configuration changes from the current configuration to a specified number of previous sessions, enter the show configuration rollback changes last commit-rangecommand:

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

Building configuration...

interface Loopback3 no description

no ipv4 address 10.0.1.1 255.0.0.0 exit

interface Loopback4 no description

no ipv4 address 10.0.0.1 255.0.0.0 end

In the preceding example, the command display shows the proposed rollback configuration changes for the last two commit IDs.

Rolling Back the Configuration to a Specific Rollback Point

When you roll back the configuration to a specific rollback point, you undo all configuration changes made during the session identified by the commit ID for that rollback point, and you undo all configuration changes made after that point. The rollback process rolls back the configuration and commits the rolled-back configuration.

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

To roll back the router configuration to a previously committed configuration, enter the rollback configuration to commitId command:

RP/0/RP0/CPU0:router# rollback configuration to 1000000325

Configuration successfully rolled back to ’1000000325’.

Rolling Back the Configuration over a Specified Number of Commits

When you roll back the configuration over a specific number of commits, you do not have to enter a specific commit ID. Instead, you specify a number x, and the software undoes all configuration changes made in the last x committed configuration sessions. The rollback process rolls back the configuration and commits the rolled-back configuration.

Cisco IOS XR Getting Started Guide

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Contents Contents Configuring Additional Router FeaturesRelated Topic Document Title Configuring Telnet, HTTP, and XML Host ServicesConfigure Domain name-server ipv4-address Commit End Show hostsDescriptions of the Telnet commands Managing Configuration History and RollbackFollowing example, the host services are enabled Installation and activation of the ManageabilityDisplaying the CommitIDs Show configuration commit list command display Displaying the Configuration History LogRP/0/RP0/CPU0router# show configuration commit list RP/0/0/CPU0router# show configuration commit changes Displaying the Configuration Changes Recorded in a CommitIDPreviewing Rollback Configuration Changes Configuration commit historyRP/0/RP0/CPU0router# show configuration rollback changes to Rolling Back the Configuration to a Specific Rollback PointRP/0/RP0/CPU0router# rollback configuration to RP/0/RP0/CPU0router# rollback configuration last Loading the Configuration Changes for a Specific CommitIDDeleting CommitIDs Saving and Loading Target Configuration FilesLoading the Target Configuration from a File Saving the Target Configuration to a FileLoading an Alternative Configuration at System Startup Logging Locations and Severity Levels Configuring Logging and Logging CorrelationAlarm Logging Correlation Logging Destination Command Global Configuration ModeCommand or Action Purpose Configuring Basic Message LoggingExample Ends the configuration session and returns to When a severity level is specified, onlyCommits the target configuration to the router Running configurationCreating and Modifying User Accounts and User Groups Configuration of system loggingCommands used to configure logging Configuration of alarm correlation and generatingCommand Description Configuring User AccountsCreating Users and Assigning Groups Password 0 7 passwordEnd or commit Modify user groups, and configure remote AAA access Configuration LimitingCreate users, assign users to user groups, create Exec Mode Static Route Configuration LimitsDefault Absolute Maximum Configuration Command Show Current Settings CommandMaximum-redistributed-prefixes n Show isis adjacency IS-IS Configuration LimitsOSPFv2 and v3 Configuration Limits Limit Mode Exec ModeIf the maximum paths Maximum paths n Show running-config router ospfMaximum interfaces n Show ospf Maximum redistributed-prefix n Show ospfMaximum Interfaces for Each Ospf Instance Maximum-prefix n Show bgp neighbor IPaddress BGP Configuration LimitsDefault Absolute Maximum Configuration Command Feature Limit DescriptionMaximum paths Maximum-paths n Show running-configRouting Policy Language Line and Policy Limits RP/0/RP1/CPU0router# show rpl maximum Limit Global Configuration Mode Exec Mode Multicast Configuration LimitsOther Configuration Limits Mpls Configuration Limits
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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.
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