Catalyst 2950 And Catalyst 2955 Switch Command Reference (full Book In .

Preface Organization Note This software release does not support the Catalyst 2950 LRE switches. For information about these switches, refer to the Catalyst 2950 LRE switch release notes. This guide provides the information you need about the CLI commands that have been created or changed for use with the Catalyst 2950 family of switches. For information about the standard IOS Release 12.1 commands, refer to the IOS documentation set available from the Cisco.com home page by selecting Service and Support Technical Documents. On the Cisco Product Documentation home page, select Release 12.1 from the Cisco IOS Software drop-down list. This guide does not provide procedures for configuring your switch. For detailed configuration procedures, refer to the Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide for this release. This guide does not describe system messages you might encounter. For more information, refer to the Catalyst 2950 and Catalyst 2955 Switch System Message Guide for this release. Organization This guide is organized into these chapters: Chapter 1, “Using the Command-Line Interface,” describes how to access the command modes and use the switch CLI to configure software features. It also lists the commands that have the same function but different syntax in software releases earlier than Release 12.1(6)EA2 and in Release 12.1(6)EA2 or later. Chapter 2, “Cisco IOS Commands,” describes in alphabetical order the IOS commands that you use to configure and monitor your switch. Appendix A, “Catalyst 2955-Specific Alarm Commands,” describes the IOS commands that you use to set alarms related to temperature, power supply conditions, and the status of the Ethernet ports. Appendix B, “Debug Commands,” describes the debug privileged EXEC commands. Debug commands are helpful in diagnosing and resolving internetworking problems. Conventions This guide uses these conventions to convey instructions and information: Command descriptions use these conventions: Commands and keywords are in boldface text. Arguments for which you supply values are in italic. Square brackets ([ ]) mean optional elements. Braces ({ }) group required choices, and vertical bars ( ) separate the alternative elements. Braces and vertical bars within square brackets ([{ }]) mean a required choice within an optional element. Catalyst 2950 and Catalyst 2955 Switch Command Reference xii 78-15304-01

Preface Related Publications Interactive examples use these conventions: Terminal sessions and system displays are in screen font. Information you enter is in boldface Nonprinting characters, such as passwords or tabs, are in angle brackets ( ). screen font. Notes, cautions, and tips use these conventions and symbols: Note Caution Timesaver Means reader take note. Notes contain helpful suggestions or references to materials not contained in this manual. Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data. Means the following will help you solve a problem. The tips information might not be troubleshooting or even an action, but could be useful information. Related Publications These documents provide complete information about the switch and are available from this URL: n/cat2950/index.htm You can order printed copies of documents with a DOC-xxxxxx number from the Cisco.com sites and from the telephone numbers listed in the “Obtaining Documentation” section on page xiv. Note Release Notes for the Catalyst 2955 Switch, (not orderable but is available on Cisco.com) Switch requirements and procedures for initial configurations and software upgrades tend to change and therefore appear only in the release notes. Before installing, configuring, or upgrading the switch, refer to the release notes on Cisco.com for the latest information. Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide (order number DOC-7815303 ) Catalyst 2950 and Catalyst 2955 Switch Command Reference (order number DOC-7815304 ) Catalyst 2955 Desktop Switch System Message Guide (order number DOC-7815306 ) Catalyst 2955 Hardware Installation Guide (order number DOC-7814944 ) Catalyst GigaStack Gigabit Interface Converter Hardware Installation Guide (order number DOC-786460 ) Cluster Management Suite (CMS) online help (available only from the switch CMS software) CWDM Passive Optical System Installation Note (not orderable but is available on Cisco.com) 1000BASE-T Gigabit Interface Converter Installation Notes (not orderable but is available on Cisco.com) Catalyst 2950 and Catalyst 2955 Switch Command Reference 78-15304-01 xiii

Preface Obtaining Documentation Note For information about the Catalyst 2950 LRE switches, refer to these documents: Catalyst 2950 Desktop Switch Software Configuration Guide, Cisco IOS Release 12.1(11)EA1 and Release 12.1(11)YJ (order number DOC-7814982 ) Catalyst 2950 Desktop Switch Command Reference, Cisco IOS Release 12.1(11)EA1 and Release 12.1(11)YJ (order number DOC-7814984 ) Catalyst 2950 Desktop Switch System Message Guide, Cisco IOS Release 12.1(11)EA1 and Release 12.1(11)YJ (order number DOC-7814981 ) Release Notes for the Catalyst 2950 LRE Switch, Cisco IOS Release 12.1(11)YJ (not orderable but is available on Cisco.com) Obtaining Documentation The following sections provide sources for obtaining documentation from Cisco Systems. World Wide Web You can access the most current Cisco documentation on the World Wide Web at the following sites: http://www.cisco.com http://www-china.cisco.com http://www-europe.cisco.com Documentation CD-ROM Cisco documentation and additional literature are available in a CD-ROM package. 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 as an annual subscription. Ordering Documentation Cisco documentation is available 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 Catalyst 2950 and Catalyst 2955 Switch Command Reference xiv 78-15304-01

Preface Obtaining Technical Assistance 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 bug-doc@cisco.com. To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments 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.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. Catalyst 2950 and Catalyst 2955 Switch Command Reference 78-15304-01 xv

Preface Obtaining Technical Assistance 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 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: TAC.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. Catalyst 2950 and Catalyst 2955 Switch Command Reference xvi 78-15304-01

C H A P T E R 1 Using the Command-Line Interface The Catalyst 2950 and Catalyst 2955 switches are supported by Cisco IOS software. This chapter describes how to use the switch command-line interface (CLI) to configure the software features. For a complete description of the commands that support these features, see Chapter 2, “Cisco IOS Commands.” For Catalyst 2955-specific commands for setting alarms, refer to Appendix A, “Catalyst 2955-Specific Alarm Commands.” For more information on Cisco IOS Release 12.1, refer to the Cisco IOS Release 12.1 Command Summary. For task-oriented configuration steps, refer to the software configuration guide for this release. The switches are preconfigured and begin forwarding packets as soon as they are attached to compatible devices. By default, all ports belong to virtual LAN (VLAN) 1. Access to the switch itself is also through VLAN 1, which is the default management VLAN. The management VLAN is configurable. You manage the switch by using Telnet, Secure Shell (SSH) Protocol, web-based management, and Simple Network Management Protocol (SNMP) through devices connected to ports assigned to the management VLAN. Type of Memory The switch Flash memory stores the Cisco IOS software image, the startup and private configuration files, and helper files. Platforms This IOS release runs on a variety of switches. For a complete list, refer to the release notes for this software release. Note This software release does not support the Catalyst 2950 LRE switches. For information about these switches, refer to the Catalyst 2950 LRE switch release notes. Catalyst 2950 and Catalyst 2955 Switch Command Reference 78-15304-01 1-1

Chapter 1 Using the Command-Line Interface CLI Command Modes CLI Command Modes This section describes the CLI command mode structure. Command modes support specific Cisco IOS commands. For example, the interface type number command works only when entered in global configuration mode. These are the main command modes: User EXEC Privileged EXEC Global configuration Interface configuration Config-vlan VLAN configuration Line configuration Table 1-1 lists the command modes, how to access each mode, the prompt you see in that mode, and how to exit that mode. The prompts listed assume the default name Switch. Table 1-1 Command Modes Summary Command Mode Access Method Prompt Exit or Access Next Mode User EXEC This is the first level of access. Switch Enter the logout command. (For the switch) Change terminal settings, perform basic tasks, and list system information. Privileged EXEC From user EXEC mode, enter the enable command. To enter privileged EXEC mode, enter the enable command. Switch# To exit to user EXEC mode, enter the disable command. To enter global configuration mode, enter the configure command. Global configuration From privileged EXEC mode, enter the configure command. Switch(config)# To exit to privileged EXEC mode, enter the exit or end command, or press Ctrl-Z. To enter interface configuration mode, enter the interface command. Interface configuration From global configuration mode, specify an interface by entering the interface command. Switch(config-if)# To exit to privileged EXEC mode, enter the end command, or press Ctrl-Z. To exit to global configuration mode, enter the exit command. To enter subinterface configuration mode, specify a subinterface with the interface command. Config-vlan In global configuration mode, enter the vlan vlan-id command. Switch(config-vlan)# To exit to global configuration mode, enter the exit command. To return to privileged EXEC mode, enter the end command, or press Ctrl-Z. Catalyst 2950 and Catalyst 2955 Switch Command Reference 1-2 78-15304-01

Chapter 1 Using the Command-Line Interface CLI Command Modes Table 1-1 Command Modes Summary (continued) Command Mode Access Method Prompt Exit or Access Next Mode VLAN configuration From privileged EXEC mode, enter the vlan database command. Switch(vlan)# To exit to privileged EXEC mode, enter the exit command. Line configuration From global configuration mode, specify a line by entering the line command. Switch(config-line)# To exit to global configuration mode, enter the exit command. To return to privileged EXEC mode, enter the end command, or press Ctrl-Z. User EXEC Mode After you access the device, you are automatically in user EXEC command mode. The EXEC commands available at the user level are a subset of those available at the privileged level. In general, use the user EXEC commands to change terminal settings temporarily, to perform basic tests, and to list system information. The supported commands can vary depending on the version of IOS software in use. To view a comprehensive list of commands, enter a question mark (?) at the prompt. Switch ? Privileged EXEC Mode Because many of the privileged commands configure operating parameters, privileged access should be password-protected to prevent unauthorized use. The privileged command set includes those commands contained in user EXEC mode, as well as the configure command through which you access the remaining command modes. If your system administrator has set a password, you are prompted to enter it before being granted access to privileged EXEC mode. The password does not appear on the screen and is case sensitive. The privileged EXEC mode prompt is the device name followed by the pound sign ( #). Switch# Enter the enable command to access privileged EXEC mode: Switch enable Switch# The supported commands can vary depending on the version of IOS software in use. To view a comprehensive list of commands, enter a question mark (?) at the prompt. Switch# ? To return to user EXEC mode, enter the disable command. Catalyst 2950 and Catalyst 2955 Switch Command Reference 78-15304-01 1-3

Chapter 1 Using the Command-Line Interface CLI Command Modes Global Configuration Mode Global configuration commands apply to features that affect the device as a whole. Use the configure privileged EXEC command to enter global configuration mode. The default is to enter commands from the management console. When you enter the configure command, a message prompts you for the source of the configuration commands: Switch# configure Configuring from terminal, memory, or network [terminal]? You can specify either the terminal or nonvolatile RAM (NVRAM) as the source of configuration commands. This example shows you how to access global configuration mode: Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. The supported commands can vary depending on the version of IOS software in use. To view a comprehensive list of commands, enter a question mark (?) at the prompt. Switch(config)# ? To exit global configuration command mode and to return to privileged EXEC mode, enter the end or exit command, or press Ctrl-Z. Interface Configuration Mode Interface configuration commands modify the operation of the interface. Interface configuration commands always follow a global configuration command, which defines the interface type. Use the interface type number.subif command to access interface configuration mode. The new prompt shows interface configuration mode. Switch(config-if)# The supported commands can vary depending on the version of IOS soft

Catalyst 2950 and Catalyst 2955 Switch Command Reference Cisco IOS Release 12.1(12c)EA1 . Number: DOC-7815304 Text Part Number: 78-15304-01. THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL . Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork .