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Unformatted text preview: About Cisco IOS Software Documentation This chapter discusses the objectives, audience, organization, and conventions of Cisco IOS software documentation. It also provides sources for obtaining documentation from Cisco Systems. Documentation Objectives Cisco IOS software documentation describes the tasks and commands necessary to configure and maintain Cisco networking devices. Audience The Cisco IOS software documentation set is intended primarily for users who configure and maintain Cisco networking devices (such as routers and switches) but who may not be familiar with the tasks, the relationship between tasks, or the Cisco IOS software commands necessary to perform particular tasks. The Cisco IOS software documentation set is also intended for those users experienced with Cisco IOS software who need to know about new features, new configuration options, and new software characteristics in the current Cisco IOS software release. Documentation Organization The Cisco IOS software documentation set consists of documentation modules and master indexes. In addition to the main documentation set, there are supporting documents and resources. Documentation Modules The Cisco IOS documentation modules consist of configuration guides and corresponding command reference publications. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality and contain comprehensive configuration examples. Chapters in a command reference publication provide complete Cisco IOS command syntax information. Use each configuration guide in conjunction with its corresponding command reference publication. Cisco IOS Security Configuration Guide xxv About Cisco IOS Software Documentation Documentation Organization Figure 1 shows the Cisco IOS software documentation modules. Note Figure 1 The abbreviations (for example, FC and FR) next to the book icons are page designators, which are defined in a key in the index of each document to help you with navigation. The bullets under each module list the major technology areas discussed in the corresponding books. Cisco IOS Software Documentation Modules IPC FC Cisco IOS Configuration Fundamentals Configuration Guide Cisco IOS Configuration Fundamentals Command Reference FR IP2R Module FC/FR: • Cisco IOS User Interfaces • File Management • System Management Cisco IOS Wide-Area Networking Command Reference WR Module WC/WR: • ATM • Broadband Access • Frame Relay • SMDS • X.25 and LAPB Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols P2C IP3R Cisco IOS IP Command Reference, Volume 3 of 3: Multicast Cisco IOS Interface Configuration Guide IR Cisco IOS Interface Command Reference Module IC/IR: • LAN Interfaces • Serial Interfaces • Logical Interfaces P3C Cisco IOS AppleTalk and Novell IPX Configuration Guide P2R Module IPC/IP1R/IP2R/IP3R: • IP Addressing and Services • IP Routing Protocols • IP Multicast IC Cisco IOS Wide-Area Networking Configuration Guide IP1R Cisco IOS AppleTalk and Novell IPX Command Reference P3R Module P2C/P2R: • AppleTalk • Novell IPX MWC Cisco IOS Mobile Wireless Configuration Guide MWR Cisco IOS Mobile Wireless Command Reference Module MWC/MWR: • General Packet Radio Service Cisco IOS Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Configuration Guide SC Cisco IOS Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Command Reference Module P3C/P3R: • Apollo Domain • Banyan VINES • DECnet • ISO CLNS • XNS Cisco IOS Security Configuration Guide SR Cisco IOS Security Command Reference Module SC/SR: • AAA Security Services • Security Server Protocols • Traffic Filtering and Firewalls • IP Security and Encryption • Passwords and Privileges • Neighbor Router Authentication • IP Security Options • Supported AV Pairs 47953 WC Cisco IOS IP Configuration Guide Cisco IOS Security Configuration Guide xxvi About Cisco IOS Software Documentation Documentation Organization Cisco IOS Dial Technologies Configuration Guide TC BC Cisco IOS Terminal Services Configuration Guide Cisco IOS Bridging and IBM Networking Configuration Guide B2R B1R DR Cisco IOS Dial Technologies Command Reference TR Module DC/DR: • Preparing for Dial Access • Modem and Dial Shelf Configuration and Management • ISDN Configuration • Signalling Configuration • Dial-on-Demand Routing Configuration • Dial-Backup Configuration • Dial-Related Addressing Services • Virtual Templates, Profiles, and Networks • PPP Configuration • Callback and Bandwidth Allocation Configuration • Dial Access Specialized Features • Dial Access Scenarios VC Cisco IOS Voice, Video, and Fax Configuration Guide VR Cisco IOS Voice, Video, and Fax Command Reference Module VC/VR: • Voice over IP • Call Control Signalling • Voice over Frame Relay • Voice over ATM • Telephony Applications • Trunk Management • Fax, Video, and Modem Support Cisco IOS Terminal Services Command Reference Module TC/TR: • ARA • LAT • NASI • Telnet • TN3270 • XRemote • X.28 PAD • Protocol Translation QC Cisco IOS Quality of Service Solutions Configuration Guide QR Cisco IOS Quality of Service Solutions Command Reference Module QC/QR: • Packet Classification • Congestion Management • Congestion Avoidance • Policing and Shaping • Signalling • Link Efficiency Mechanisms Cisco IOS Bridging and IBM Networking Command Reference, Volume 1 of 2 Cisco IOS Bridging and IBM Networking Command Reference, Volume 2 of 2 Module BC/B1R: • Transparent Bridging • SRB • Token Ring Inter-Switch Link • Token Ring Route Switch Module • RSRB • DLSw+ • Serial Tunnel and Block Serial Tunnel • LLC2 and SDLC • IBM Network Media Translation • SNA Frame Relay Access • NCIA Client/Server • Airline Product Set XC Module BC/B2R: • DSPU and SNA Service Point • SNA Switching Services • Cisco Transaction Connection • Cisco Mainframe Channel Connection • CLAW and TCP/IP Offload • CSNA, CMPC, and CMPC+ • TN3270 Server Cisco IOS Switching Services Configuration Guide XR Cisco IOS Switching Services Command Reference Module XC/XR: • Cisco IOS Switching Paths • NetFlow Switching • Multiprotocol Label Switching • Multilayer Switching • Multicast Distributed Switching • Virtual LANs • LAN Emulation 47954 DC Cisco IOS Security Configuration Guide xxvii About Cisco IOS Software Documentation Documentation Organization Master Indexes Two master indexes provide indexing information for the Cisco IOS software documentation set: an index for the configuration guides and an index for the command references. Individual books also contain a book-specific index. The master indexes provide a quick way for you to find a command when you know the command name but not which module contains the command. When you use the online master indexes, you can click the page number for an index entry and go to that page in the online document. Supporting Documents and Resources The following documents and resources support the Cisco IOS software documentation set: • Cisco IOS Command Summary (three volumes)—This publication explains the function and syntax of the Cisco IOS software commands. For more information about defaults and usage guidelines, refer to the Cisco IOS command reference publications. • Cisco IOS System Error Messages—This publication lists and describes Cisco IOS system error messages. Not all system error messages indicate problems with your system. Some are purely informational, and others may help diagnose problems with communications lines, internal hardware, or the system software. • Cisco IOS Debug Command Reference—This publication contains an alphabetical listing of the debug commands and their descriptions. Documentation for each command includes a brief description of its use, command syntax, usage guidelines, and sample output. • Dictionary of Internetworking Terms and Acronyms—This Cisco publication compiles and defines the terms and acronyms used in the internetworking industry. • New feature documentation—The Cisco IOS software documentation set documents the mainline release of Cisco IOS software (for example, Cisco IOS Release 12.2). New software features are introduced in early deployment releases (for example, the Cisco IOS “T” release train for 12.2, 12.2(x)T). Documentation for these new features can be found in standalone documents called “feature modules.” Feature module documentation describes new Cisco IOS software and hardware networking functionality and is available on Cisco.com and the Documentation CD-ROM. • Release notes—This documentation describes system requirements, provides information about new and changed features, and includes other useful information about specific software releases. See the section “Using Software Release Notes” in the chapter “Using Cisco IOS Software” for more information. • Caveats documentation—This documentation provides information about Cisco IOS software defects in specific software releases. • RFCs—RFCs are standards documents maintained by the Internet Engineering Task Force (IETF). Cisco IOS software documentation references supported RFCs when applicable. The full text of referenced RFCs may be obtained on the World Wide Web at http://www.rfc-editor.org/. • MIBs—MIBs are used for network monitoring. For lists of supported MIBs by platform and release, and to download MIB files, see the Cisco MIB website on Cisco.com at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml. Cisco IOS Security Configuration Guide xxviii About Cisco IOS Software Documentation New and Changed Information New and Changed Information The following is new or changed information since the last release of the Cisco IOS Security Configuration Guide: • A new chapter titled “Configuring Secure Shell” has been added to the section “Other Security Features.” This chapter describes SSH, which consists of a protocol and application that provide a secure replacement to the Berkeley r-tools. • The “RADIUS Attributes” appendix has been expanded to include attribute information such as a RADIUS packet format description and RADIUS files. For more information, refer to the RADIUS Attributes appendix at the end of the book. • The chapter titled “Configuring Cisco Encryption Technology” has been deleted from the section “IP Security and Encryption.” This functionality is no longer supported. For information regarding CET configuration, refer to Cisco IOS Security Configuration Guide release 12.1 or earlier. Document Conventions Within Cisco IOS software documentation, the term router is generally used to refer to a variety of Cisco products (for example, routers, access servers, and switches). Routers, access servers, and other networking devices that support Cisco IOS software are shown interchangeably within examples. These products are used only for illustrative purposes; that is, an example that shows one product does not necessarily indicate that other products are not supported. The Cisco IOS documentation set uses the following conventions: Convention Description ^ or Ctrl The ^ and Ctrl symbols represent the Control key. For example, the key combination ^D or Ctrl-D means hold down the Control key while you press the D key. Keys are indicated in capital letters but are not case sensitive. string A string is a nonquoted set of characters shown in italics. For example, when setting an SNMP community string to public, do not use quotation marks around the string or the string will include the quotation marks. Command syntax descriptions use the following conventions: Convention Description boldface Boldface text indicates commands and keywords that you enter literally as shown. italics Italic text indicates arguments for which you supply values. [x] Square brackets enclose an optional element (keyword or argument). | A vertical line indicates a choice within an optional or required set of keywords or arguments. [x | y] Square brackets enclosing keywords or arguments separated by a vertical line indicate an optional choice. {x | y} Braces enclosing keywords or arguments separated by a vertical line indicate a required choice. Cisco IOS Security Configuration Guide xxix About Cisco IOS Software Documentation Obtaining Documentation Nested sets of square brackets or braces indicate optional or required choices within optional or required elements. For example: Convention Description [x {y | z}] Braces and a vertical line within square brackets indicate a required choice within an optional element. Examples use the following conventions: Convention Description screen Examples of information displayed on the screen are set in Courier font. boldface screen Examples of text that you must enter are set in Courier bold font. < Angle brackets enclose text that is not printed to the screen, such as passwords. > ! [ An exclamation point at the beginning of a line indicates a comment line. (Exclamation points are also displayed by the Cisco IOS software for certain processes.) Square brackets enclose default responses to system prompts. The following conventions are used to attract the attention of the reader: Caution Note Timesaver Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data. Means reader take note. Notes contain helpful suggestions or references to materials not contained in this manual. Means the described action saves time. You can save time by performing the action described in the paragraph. Obtaining Documentation The following sections provide sources for obtaining documentation from Cisco Systems. World Wide Web The most current Cisco documentation is available on the World Wide Web at the following website: http://www.cisco.com Translated documentation is available at the following website: http://www.cisco.com/public/countries_languages.html Cisco IOS Security Configuration Guide xxx About Cisco IOS Software Documentation Documentation Feedback Documentation CD-ROM Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription. Ordering Documentation Cisco documentation can be ordered in the following ways: • Registered Cisco Direct Customers can order Cisco product documentation from the Networking Products MarketPlace: http://www.cisco.com/cgi-bin/order/order_root.pl • Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store: http://www.cisco.com/go/subscription • Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, in North America, by calling 800 553-NETS(6387). Documentation Feedback If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. You can e-mail your comments to [email protected] To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address: Cisco Systems, Inc. Document Resource Connection 170 West Tasman Drive San Jose, CA 95134-9883 We appreciate your comments. Obtaining Technical Assistance Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC website. Cisco IOS Security Configuration Guide xxxi About Cisco IOS Software Documentation Obtaining Technical Assistance Cisco.com Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco. Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available. Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco. To access Cisco.com, go to the following website: http://www.cisco.com Technical Assistance Center The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract. Contacting TAC by Using the Cisco TAC Website If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website: http://www.cisco.com/tac P3 and P4 level problems are defined as follows: • P3—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue. • P4—You need information or assistance on Cisco product capabilities, product installation, or basic product configuration. In each of the above cases, use the Cisco TAC website to quickly find answers to your questions. To register for Cisco.com, go to the following website: http://www.cisco.com/register/ If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website: http://www.cisco.com/tac/caseopen Cisco IOS Security Configuration Guide xxxii About Cisco IOS Software Documentation Obtaining Technical Assistance Contacting TAC by Telephone If you have a priority level 1 (P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following website: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml P1 and P2 level problems are defined as follows: • P1—Your production network is down, causing a critical impact to business operations if service is not restored quickly. No workaround is available. • P2—Your production network is severely degraded, affecting significant aspects of your business operations. No workaround is available. Cisco IOS Security Configuration Guide xxxiii About Cisco IOS Software Documentation Obtaining Technical Assistance Cisco IOS Security Configuration Guide xxxiv Using Cisco IOS Software This chapter provides helpful tips for understanding and configuring Cisco IOS software using the command-line interface (CLI). It contains the following sections: • Understanding Command Modes • Getting Help • Using the no and default Forms of Commands • Saving Configuration Changes • Filtering Output from the show and more Commands • Identifying Supported Platforms For an overview of Cisco IOS software configuration, refer to the Cisco IOS Configuration Fundamentals Configuration Guide. For information on the conventions used in the Cisco IOS software documentation set, see the chapter “About Cisco IOS Software Documentation” located at the beginning of this book. Understanding Command Modes You use the CLI to access Cisco IOS software. Because the CLI is divided into many different modes, the commands available to you at any given time depend on the mode you are currently in. Entering a question mark (...
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