Cisco Systems IOS XR manual Configuring Additional Router Features, Contents

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C H A P T E R 3

Configuring Additional Router Features

This chapter contains instructions and information for entering basic configurations using the command-line interface (CLI).

Contents

This chapter contains the following sections:

•Configuring the Domain Name and Domain Name Server, page 3-1

•Configuring Telnet, HTTP, and XML Host Services, page 3-2

•Managing Configuration History and Rollback, page 3-3

•Saving and Loading Target Configuration Files, page 3-9

•Configuring Logging and Logging Correlation, page 3-11

•Creating and Modifying User Accounts and User Groups, page 3-14

•Configuration Limiting, page 3-17

Configuring the Domain Name and Domain Name Server

Configure a domain name and domain name server (DNS) for your router to make contacting other devices on your network more efficient. Use the following guidelines:

•To define a default domain name that the Cisco IOS XR software uses to complete unqualified hostnames (names without a dotted-decimal domain name), use the domain-namecommand in global configuration mode.

•To specify the address of one or more name servers to use for name and address resolution, use the domain name-servercommand in global configuration mode. If no name server address is specified, the default name server is 255.255.255.255 so the DNS lookup can be broadcast to the local network segment. If a DNS server is in the local network, it replies. If not, there might be a server that knows how to forward the DNS request to the correct DNS server.

•Use the show hosts command in EXEC mode to display the default domain name, the style of name lookup service, a list of name server hosts, and the cached list of hostnames and addresses.

Cisco IOS XR Getting Started Guide

3-1

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Contents Contents Configuring Additional Router FeaturesConfigure Configuring Telnet, HTTP, and XML Host ServicesDomain name-server ipv4-address Commit End Show hosts Related Topic Document TitleFollowing example, the host services are enabled Managing Configuration History and RollbackInstallation and activation of the Manageability Descriptions of the Telnet commandsDisplaying the CommitIDs Show configuration commit list command display Displaying the Configuration History LogRP/0/RP0/CPU0router# show configuration commit list Previewing Rollback Configuration Changes Displaying the Configuration Changes Recorded in a CommitIDConfiguration commit history RP/0/0/CPU0router# show configuration commit changesRP/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 Alarm Logging Correlation Configuring Logging and Logging CorrelationLogging Destination Command Global Configuration Mode Logging Locations and Severity LevelsCommand or Action Purpose Configuring Basic Message LoggingExample Commits the target configuration to the router When a severity level is specified, onlyRunning configuration Ends the configuration session and returns toCommands used to configure logging Configuration of system loggingConfiguration of alarm correlation and generating Creating and Modifying User Accounts and User GroupsCommand 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 Default Absolute Static Route Configuration LimitsMaximum Configuration Command Show Current Settings Command Exec ModeOSPFv2 and v3 Configuration Limits IS-IS Configuration LimitsLimit Mode Exec Mode Maximum-redistributed-prefixes n Show isis adjacencyMaximum interfaces n Show ospf Maximum paths n Show running-config router ospfMaximum redistributed-prefix n Show ospf If the maximum pathsMaximum Interfaces for Each Ospf Instance Default Absolute Maximum Configuration Command BGP Configuration LimitsFeature Limit Description Maximum-prefix n Show bgp neighbor IPaddressMaximum 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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