Cisco Systems Cisco IOS XR manual

Chapter 4 Configuring General Router Features

Managing Configuration Sessions

Clearing All Changes to a Target Configuration

To clear changes made to the target configuration without terminating the configuration session, enter the clear command in global configuration mode or administration configuration mode. This command deletes any configuration changes that have not been committed.

In the following example, the user configures an interface but does not commit it. After reviewing the changes to the target configuration with the show configuration command, the user decides to remove the changes and start over by entering the clear command:

RP/0/RP0/CPU0:router# configure

RP/0/RP0/CPU0:router(config)# interface POS 0/3/0/1

RP/0/RP0/CPU0:router(config-if)# description this is my interface

RP/0/RP0/CPU0:router(config-if)# ipv4 address 10.1.1.1 255.0.0.0

RP/0/RP0/CPU0:router(config-if)# shutdown

RP/0/RP0/CPU0:router(config-if)# exit

RP/0/RP0/CPU0:router(config)# show configuration

Building configuration...

interface POS0/3/0/1 description this is my interface ipv4 address 10.1.1.1 255.0.0.0 shutdown

end

RP/0/RP0/CPU0:router(config)# clear

RP/0/RP0/CPU0:router(config)# show configuration

Building configuration...

end

Committing Changes to the Running Configuration

The changes in the target configuration do not become part of the running configuration until you enter the commit command. When you commit a target configuration, you can use the commit command to do either of the following:

•Merge the target configuration with the running configuration to create a new running configuration.

•Replace the running configuration with the target configuration.

Note If you try to end a configuration session without saving your changes to the running configuration with the commit command, you are prompted to save the changes. See the “Ending a Configuration Session” section on page 4-37for more information.

	Cisco IOS XR Getting Started Guide
4-34	OL-10957-02

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Cisco Systems Cisco IOS XR Clearing All Changes to a Target Configuration, Committing Changes to the Running Configuration

Contents

Cisco IOS XR Getting Started Guide Americas Headquarters Cisco IOS XR Getting Started Guide N T E N T S Restrictions Verifying the Spanning Tree Routing Policy Language Line and Policy Limits Contents CLI Tips and Shortcuts Configuration Failures During a Commit Operation Viii Changes to This Document About This DocumentRevision Date Change Summary Intended Audience Organization of the DocumentRelated Documents This document contains the following chapters Obtaining Documentation ConventionsCisco.com Convention Documentation Feedback Cisco Product Security OverviewProduct Documentation DVD Ordering Documentation Xii Reporting Security Problems in Cisco Products Product Alerts and Field NoticesXiii Obtaining Technical Assistance Cisco Technical Support & Documentation WebsiteXiv Submitting a Service Request Definitions of Service Request SeverityObtaining Additional Publications and Information Xvi Contents Supported Standalone System Configurations Cisco CRS-1 Multishelf System Overview Single-FCC Multishelf System Two-FCC Multishelf System Four-FCC Multishelf System Command-Line Interface Router Management InterfacesCraft Works Interface Extensible Markup Language API Selecting and Identifying the Designated Shelf Controller Simple Network Management Protocol Selecting and Identifying the DSC on Cisco CRS-1 Routers Connecting to the Router Through the Console Port Communication Ports on the RP for a Cisco CRS-1 16-Slot LCC Card status green=OK To connect to the router, perform the following procedure Start the terminal emulation program Press Enter Command or Action Log in to the router Where to Go Next Command or Action PurposeIf the router has no configuration, the router displays If the router has been configured, the router displays Prerequisites Software Requirements Bringing Up and Configuring a Standalone Router Hardware Prerequisites and DocumentationEstablish a connection to the DSC Console port Examples Return Verifying the System After Initial Bring-Up Example Examples of show Commands Show version Command Show environment Command RP/0/RP0/CPU0router# show environment temperaturesShow environment options Show platform Command Show redundancy Command Multishelf System Restrictions Hardware Requirements Information About Bringing Up a Multishelf System Bringup OverviewPreparing a Rack Number Plan Chassis Serial ID Rack Number DSC in a CRS-1/M-F1 Multishelf System Sample Rack Number Plan for a Two-FCC Multishelf System Location of the Serial Number on a Fabric Card Chassis Location of the Serial Number on a Line Card Chassis Configuring the External Cisco Catalyst 6509 Switches Prerequisites Software RequirementsHardware Requirements Restrictions Before You BeginQuantity Description Part Catalyst 6500 Sup720 Compact Flash Mem 256MB Information About the Catalyst Switch Configuration Configuring the Catalyst SwitchesRevision number Switchport access vlan Sets the forward-delay timer for all MST instances on Sets the maximum-age timer for all MST instances onSets the spanning tree priority for the switch Primary Catalyst switch should be configured Example Single-FCC Multishelf System Configuration Default selectionExits interface configuration mode and returns to global Configuration mode Example Four-FCC Multishelf System Configuration Switches in a four-FCC multishelf systemCAT6k-2config# interface gigabitethernet 0/1 Router# show running-config Switchport Shutdown Verifying the Catalyst Switch Verify the Interface StatusCAT6k-1#show interfaces status Verify that the Links are Not Unidirectional CAT6k-1#show spanning-treeRouter# show interface gi 6/1 inc Gig Integrated Switch System Prerequisites for an Integrated Switch System Restrictions for an Integrated Switch System Information About the Integrated Switch ImplementationIntegrated Switch Overview Integrated Switch Functions Rack Type Description Implementing the Integrated Switch System Integrated Switch Control Network TopologyLED Definitions for the Integrated Switch System Implementing the Integrated Switch Through Rommon Implementing the Integrated Switch in Cisco IOS XR Booting Up the Integrated Switch Network6lists the Rommon switch configuration Reenabling the Ports Verifying the Control Ethernet Connection Verifying the Port Statistics Verifying Bidirectionality Verifying Spanning Tree Protocol Information Bringing Up and Configuring Rack Admin Configure Dsc serial serial ID rack Planning information including DSC placement Places the router in administration configuration modeLCC containing the DSC should be configured with Want to configure as Rack When each subsequent LCC comes on line, the DSC Enter this command for every FCC in the multishelfWhen each subsequent rack comes on line, the DSC Commits the target configuration to the router running Configures a plane to operate in an FCC slot Enter this command sequence for each of the eight fabricYou want to configure Fabric plane you are configuring. Valid slot numbers are Group cisco-support F0/SM0/FM Apply power to all FCCs Bringing Up and Verifying FCCs Show controllers fabric rack all detail Show controllers fabric rack all detail Show controllers fabric plane all detail Bringing Up and Verifying the Non-DSC LCC Show controllers fabric connectivity all detail Exit Verifying the Spanning Tree Show platform command must be executed Enter this command for each RP and Scge cardSwitched Interface column, one GE port Expected Catalyst switch, as defined by the Catalyst Verify the Spanning Tree Detail location 0/rp1/cpu0 Detail location 1/rp0/cpu0Detail location 1/rp1/cpu0 Verifying Fabric Cabling Connections Detail location F0/SC0/cpu0Detail location F0/SC1/cpu0 LED State Color Meaning If the LED is off, it can mean 10 6 11 7 OIM11 OIM0 Where to Go Next OL-10957-02 Secure Domain Routers Chapter contains the following sections Connecting and Communicating with the Router 3shows the DRP Plim connections Remote CLI, CWI XML, or Snmp Card status green=OK Communication Ports on the DRP Plim Establishing a Connection Through the Console Port Summary Steps Establishing a Connection Through a Terminal Server Standalone router is starting up for the first time, seeStandalone Router. If a multishelf system is starting Up for the first time, see , Bringing Up Install and configure the terminal server Press Enter Log in to the router Replace access-server-address with the IP address Root-system username and password when promptedEstablishes a Telnet session with the terminal server Terminal server, and replace port with the terminal Logging In to a Router or an SDR Telnet ManagementEthernetInterfaceIPaddress CLI Prompt Prompt Syntax Components Description User Access Privileges User Groups, Task Groups, and Task IDs Command Description Predefined User GroupsUser Group Privileges Personnel Show user tasks Show user allShow aaa usergroup group-name Aaa usergroup root-system User group root-system Inherits from task group Root-system Navigating the Cisco IOS XR Command Modes Identifying the Command Mode in the CLI Prompt Command Mode Navigation Example, Summary of Common Command Modes Command Mode DescriptionExample Not available on most routers Entering Exec Commands from a Configuration Mode Password recovery, and other diagnostic tasks Command Mode Navigation Example Managing Configuration Sessions 6illustrates the two-stage configuration process Displaying the Active Configuration Sessions RP/0/RP0/CPU0router# show configuration sessions Starting a Configuration Session RP/0/RP0/CPU0routerconfig-if#ipv4 address 10.10.10.10 Starting an Exclusive Configuration Session Displaying Configuration Details with show CommandsDisplaying the Running Configuration Following sections describe the following tasks Ntp Displaying a Sanitized Version of the Running Configuration Telnet ipv4 server max-servers 5 username removed Displaying the Target Configuration Displaying a Combined Target and Running Configuration Displaying Configuration Error Messages and Descriptions Configuration failed load command Saving the Target Configuration to a File Loading the Target Configuration from a FileLoading an Alternative Configuration at System Startup Clearing All Changes to a Target Configuration Committing Changes to the Running Configuration Show configuration commit list detail command Commit best-effortCommit comment line Commit confirmed Reloading a Failed Configuration RP/0/0/CPU0routerconfig# load configuration failed commit Exiting a Configuration Submode Returning Directly to Configuration Mode from a SubmodeEnding a Configuration Session Configuring the SDR Hostname Aborting a Configuration SessionPreceding example sets the SDR name to Sdrsj Configuring the Management Ethernet Interface Syntax Components Description Displaying the Available Management Ethernet Interfaces Management Interface Interface Name Example Configuring the Management Ethernet Interface Configure Interface MgmtEthrack/slot/CPU0/portPrerequisites Enters global configuration mode Enters interface configuration mode and specifiesCommand parameters are described in Table Exits the Management Ethernet interface configuration Ends the configuration session and returns to Exec Displays the interface details to verify the settingsRP/0/RP0/CPU0routerconfig-if#ipv4 address 10.1.1.1 Show interfaces MgmtEth rack/ slot/CPU0/ port Manually Setting the Router Clock Clock update-calendar Show clockRelated Topic Document Title Commit End Clock timezone command should be entered Enter the show clock commandFor detailed information about setting the system Clock, including the configuration of a network time Related Documents Configuring Additional Router Features Configuring Telnet, HTTP, and XML Host Services Following example, the domain name and DNS are configuredComplete descriptions of the domain services Commands Managing Configuration History and Rollback Following example, the host services are enabledInstallation and activation of the Manageability Descriptions of the Telnet commands Displaying the Configuration Changes Recorded in a CommitID RP/0/RP1/CPU0router# show configuration commit listRP/0/RP1/CPU0routeradmin# show configuration commit list Displaying the CommitIDs Previewing Rollback Configuration Changes RP/0/RP1/CPU0routeradmin# show configuration commit changesRP/0/RP1/CPU0router# show configuration rollback changes to Rolling Back the Configuration to a Specific Rollback Point RP/0/RP1/CPU0router# rollback configuration toRP/0/RP0/CPU0router# rollback configuration last RP/0/RP1/CPU0router# show configuration commit changes ? RP/0/0/CPU0routerconfig# load rollback changes to RP/0/0/CPU0routerconfig# load rollback changesRP/0/0/CPU0router# clear configuration commit diskspace Deleting CommitIDs Configuring Logging and Logging Correlation Logging Destination Command Global Configuration ModeLogging Locations and Severity Levels Level Description Alarm Logging Correlation Configuring Basic Message LoggingLogging trap severity Logging console severity Commit End Show logging RP/0/RP0/CPU0routerconfig# logging RP/0/RP0/CPU0routerconfig# logging trap debugging LevelsWhen a severity level is specified, only messages at Specifies a syslog server host to use for system logging Following example, basic message logging is configured Configuration of system loggingCommands used to configure logging Configuration of alarm correlation and generating Creating and Modifying User Accounts and User Groups Configuring User Accounts Creating Users and Assigning Groups Enters username configuration submode Specifies a password for the user named in StepUse the secret command to create a secure login Password for the user names specified in Step Configuration Limiting Static Route Configuration LimitsDefault Absolute Configuration Command Limit Mode IS-IS Configuration Limits OSPFv2 and v3 Configuration LimitsLimit Mode Exec Mode Maximum-redistributed-prefixes n Show isis adjacency Maximum paths n Show running-config router ospf Maximum interfaces n Show ospfMaximum redistributed-prefixes Show ospf If the maximum paths Maximum Routes Redistributed into Ospf BGP Configuration Limits Default Absolute Maximum Configuration CommandFeature Limit Description Routing Policy Language Line and Policy Limits RP/0/RP1/CPU0router# show rpl maximum Multicast Configuration Limits Mpls Configuration LimitsDefault Absolute Show Current Settings Maximum Command Limit Configuration Command Exec Mode Other Configuration Limits CLI Tips, Techniques, and Shortcuts CLI Tips and Shortcuts Entering Abbreviated Commands Using the Question Mark ? to Display On-Screen Command Help That apply to the keyword and brief explanations Generally, uppercase letters represent variables arguments Completing a Partial Command with the Tab Key Identifying Command Syntax Errors Displaying System Information with show Commands Using the no Form of a CommandEditing Command Lines that Wrap Common show Commands Command Description Command Mode Browsing Display Output when the --More-- Prompt Appears Halting the Display of Screen Output Narrowing Output from Large Configurations RP/0/RP1/CPU0router# show running-config router staticRedirecting Output to a File Filtering show Command Output Using Wildcards to Display All Instances of an InterfaceRP/0/RP1/CPU0router# show running-config interface pos Adding a Filter at the --More-- Prompt Contains the regular expressionDisplays output lines that contain the regular expression File on the specified device Using Wildcards to Identify Interfaces in show Commands Wildcards, Templates, and AliasesExample Wildcard Syntax Description Creating Configuration Templates RP/0/RP1/CPU0router# show interfaces pos* brief Show running-config template template-name End-template Applying Configuration Templates Applies the target configuration commands to the runningRP/0/RP0/CPU0router# show running-config Template tmplt1 Show running-config template template-name 5defines the alias command syntax Aliases Command History Keystrokes Used as Command AliasesDisplaying Previously Entered Commands RP/0/0/CPU0routerconfig# alias my-cookie mgmtEth 0/0/CPU0/0 Recalling Previously Entered Commands Redisplaying the Command LineCommand or Key Combination Purpose Command or Key Combination Recalls Key Combinations Key Combinations to Move the CursorKeystrokes to Control Capitalization Keystrokes Function Moves the Cursor Keystrokes to Delete CLI Entries Transposing Mistyped CharactersEsc, L Esc, U Keystrokes Deletes OL-10957-02 Basic Troubleshooting Commands Additional Sources for Information Show variables boot Show installShow context and show exception Show controller Using the ping Command Using the traceroute Command Following example, a successful ping attempt is shownNext example, an unsuccessful ping attempt is shown Using debug Commands Displaying a List of Debug FeaturesFollowing example, the route for an IP address is displayed RP/0/RP0/CPU0router# traceroute Enabling Debugging for a Feature Displaying Debugging Status Configuration Error Messages Disabling Debugging for a Service Configuration Failures During a Commit Operation Configuration Errors at StartupShow configuration failed command Show configuration failed noerror command Memory Warnings in Configuration Sessions Understanding Low-Memory Warnings in Configuration Sessions ERROR! Memory is in Severe or Critical State Displaying System Memory Information Removing Configurations to Resolve Low-Memory Warnings Clearing a Target ConfigurationRemoving Committed Configurations to Free System Memory Heading Description Rolling Back to a Previously Committed Configuration Clearing Configuration Sessions Interfaces Not Coming Up Contacting TAC for Additional AssistanceVerifying the System Interfaces Configure the interfaces, as shown in the following examples RP/0/RP0/CPU0router# show ipv4 interface brief Bring the interface up with the following commands Connection OL-10957-02 Regular Expressions Special Characters Character Pattern RangesCharacter Special Meaning Complex Regular Expressions Using Multipliers Multiple-Character PatternsCharacter Description Ba?b Pattern Alternation Anchor CharactersUnderscore Wildcard Parentheses Used for Pattern Recall Bc.\1\2 OL-10957-02 Denoted as primary GL-1 Into memory at startup Is from 0x0 to 0xFFFF 0 to 65535 in decimalProcesses Client runs in a web browser Installation or upgrade Have a registered name in the same styleOutgoing channel Received Examples of platforms using a GUI. See also CLI Need to provide continuous serviceGL-4 Provides other information relevant to IP packet processing RIPGL-5 To boot a node 048,576 bitsStandard and private proprietary branches IP routing information Card installed and running on the router Battery permanently connectedLoading software images from a network server, such as Tftp Sent to it by a peer Group of software components installed on the router Interfaces connecting to a Cisco CRS-1 routerSDH frames GL-8 Delay, and delivery guarantee DataGL-9 GL-10 Cisco Technical Assistance Center GL-11 GL-12 GL-13 GL-14 IN-1 IS-IS MulticastStatic routes IN-2 DRP Plim illustration PRP-2 illustration RP for 4-slot and 8-slot LCCs, illustration 1-11,4-4IN-3 Low memory warning, removing configurations IN-4 Maximum-paths command Module Number displayed in prompt More promptIN-5 FCC IN-6 IN-7 Show task supported command Show tech-support command 6-6,7-3 Show user commandStatus LEDs IN-8 Username command WildcardsIN-9 IN-10