Cisco Router Cisco IOS XR - Parentheses Used for Pattern Recall

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Cisco IOS XR Getting Started Guide

OL-10957-02

Appendix A Understanding Regular Expressions, Special Characters, and Patterns

Parentheses Used for Pattern Recall

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Default Chapter3
- Table of Contents3
About this Document9
Chapter 1 Introduction to Cisco IOS XR Software10
Preface10
- Intended Audience10
- Related Documents Conventions10
Obtaining Documentation11
Documentation Feedback12
Cisco Product Security Overview12
Product Alerts and Field Notices13
Obtaining Technical Assistance14
Obtaining Additional Publications and Information15
- Contents17
- Supported Standalone System Configurations17
- Chapter 1 Introduction to Cisco IO XR Software18
- Cisco CRS-1 Multishelf System Overview18
- Router Management Interfaces22
- Selecting and Identifying the Designated Shelf Controller23
- Connecting to the Router through the Console Port25
Chapter 2 Bringing up the Cisco IOS XR Software on a Standalone Router30
- Where to Go Next30
- Contents31
- Prerequisites31
- Bringing up and Configuring a Standalone Router32
- Verifying the System after Initial Bring-Up34
- Where to Go Next38
CHAPTER 3 Bringing up the Cisco IOS XR Software on a Multishelf System39
- Contents39
- Prerequisites39
- Restrictions40
- Information about Bringing up a Multishelf System41
  - Bringup Overview41
  - Preparing a Rack Number Plan41
- Configuring the External Cisco Catalyst 6509 Switches46
- Integrated Switch System58
- Bringing up and Configuring Rack 066
- Bringing up and Verifying Fccs72
- Bringing up and Verifying the Non-DSC LCC75
- Verifying the Spanning Tree77
- Verifying Fabric Cabling Connections81
- Where to Go Next85
CHAPTER 4 Configuring General Router Features87
- Secure Domain Routers87
- C H a P T E R 4 Configuring General Router Features88
- Connecting and Communicating with the Router88
- Logging in to a Router or an SDR97
- CLI Prompt98
- User Access Privileges99
- Navigating the Cisco IOS XR Command Modes103
- Managing Configuration Sessions109
- Configuring the SDR Hostname124
- Configuring the Management Ethernet Interface125
- Manually Setting the Router Clock130
- Where to Go Next132
CHAPTER 5 Configuring Additional Router Features133
- Configuring the Domain Name and Domain Name Server133
- C H a P T E R 5 Configuring Additional Router Features134
Configuring Telnet, HTTP, and XML Host Services134
- Prerequisites134
Managing Configuration History and Rollback135
- Displaying the Commitids136
- Displaying the Configuration Changes Recorded in a Commitid136
- Previewing Rollback Configuration Changes137
- Rolling Back the Configuration to a Specific Rollback Point138
- Rolling Back the Configuration over a Specified Number of Commits138
- Loading Commitid Configuration Changes to the Target Configuration139
- Loading Rollback Configuration Changes to the Target Configuration140
- Deleting Commitids140
Configuring Logging and Logging Correlation141
- Logging Locations and Severity Levels141
- Alarm Logging Correlation142
- Configuring Basic Message Logging142
- Disabling Console Logging144
Creating and Modifying User Accounts and User Groups145
- Displaying Details about User Accounts, User Groups, and Task Ids145
- Configuring User Accounts146
- Creating Users and Assigning Groups146
Configuration Limiting148
- Static Route Configuration Limits148
- IS-IS Configuration Limits149
- Ospfv2 and V3 Configuration Limits149
- BGP Configuration Limits152
- Routing Policy Language Line and Policy Limits153
- Multicast Configuration Limits155
- MPLS Configuration Limits155
- Other Configuration Limits156
- CLI Tips and Shortcuts157
  - Entering Abbreviated Commands158
  - Using the Question Mark (?) to Display On-Screen Command Help158
Chapter 6 CLI Tip, Technique, and Shortcut159
- Completing a Partial Command with the Tab Key160
- Identifying Command Syntax Errors160
- Using the no Form of a Command161
- Editing Command Lines that Wrap161
- Displaying System Information with Show Commands161
  - Common Show Commands162
- Browsing Display Output When the --More-- Prompt Appears163
- Halting the Display of Screen Output163
- Redirecting Output to a File164
- Narrowing Output from Large Configurations164
- Filtering Show Command Output165
Table166
- Wildcards, Templates, and Aliases167
- Command History172
- Key Combinations174
- Additional Sources for Information177
- Basic Troubleshooting Commands177
CHAPTER 7 Troubleshooting the Cisco IOS XR Software177
- C H a P T E R 7 Troubleshooting the Cisco IOS XR Software178
- Using Show Commands to Display System Status and Configuration178
- Using the Ping Command179
- Using the Traceroute Command180
- Using Debug Commands181
- Enabling Debugging for a Feature182
- Configuration Error Messages183
  - Configuration Failures During a Commit Operation184
  - Configuration Errors at Startup184
- Memory Warnings in Configuration Sessions185
- Interfaces Not Coming up189
  - Verifying the System Interfaces189
Appendix193
- Regular Expressions193
Understanding Regular Expressions, Special Characters, and Patterns193
Special Characters194
- A P P E N D I X a Understanding Regular Expressions, Special Characters, and Patterns195
Character Pattern Ranges194
Multiple-Character Patterns195
Complex Regular Expressions Using Multipliers195
Pattern Alternation196
Anchor Characters196
- Parentheses Used for Pattern Recall196
Underscore Wildcard196
Parentheses Used for Pattern Recall198
G L O S S a R y199
I N D E X213

Cisco Router Cisco IOS XR - Parentheses Used for Pattern Recall

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